Added(A)/Deleted(D) following books

 A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_0cfmKH1.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_0vE2Agb.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_1pO6mlQ.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_2DVKX4L.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_2tbXSIz.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_4DFRgPd.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_5BlMA37.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_6BpYQtS.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_7oQcI9D.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_7osIJcS.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_BljETDD.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_BrFEmk0.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_Cde70Gn.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_DGhuTd1.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_DnIfPiv.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_Ekp0nuF.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_HETTD7r.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_KlAE574.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_PjpHu09.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_PxZ5uHj.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_Q4fBBjq.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_T4mzLHI.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_UAITY0U.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_VEDuU8Y.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_WUGl4w9.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_a1WJQcD.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_bH5qWgx.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_e3fJkOS.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_eA2iMeu.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_eYNgYIE.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_gBECinX.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_k1gQDvp.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_kA9oA4k.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_kMX1E4Y.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_ludD60G.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_nK3AyHX.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_nbFgz6I.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_qJkWZ89.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_qaQF6hK.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_tuNOeJT.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_vEF8v8F.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_w1kpJlA.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_wmNEbtc.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_x8Hd3Fi.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_zAHS5nJ.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_2xS3kzU.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_38fwENU.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_5kVbclY.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_7O92CYB.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_7qFSSzO.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_87EQl05.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_8HPcuEd.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ASNXGJK.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_BQB3vIT.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_BdKInur.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_CK1r2By.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_EIfrtvz.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_EnoiEf8.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_GocmY97.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_Gw8rqEI.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_HDB18kP.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_IdqLKrq.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_InkBya3.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_K9q4NLY.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_M6VOIpZ.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_MATCOZO.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ObFCoay.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_PD3CwbT.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_PVVeE6Y.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_PdPqoEJ.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_QritHDf.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_SUaeUO3.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_TkYEtJb.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_UDdHMGf.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_VZgSOpH.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_Yj265eH.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ZDKRJ4L.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ZyyCtEx.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_dGjHrPW.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_egC1oo4.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_enqQgpr.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_gD58ZqH.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_gETWb31.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_gSjl2uf.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_hnPoOrk.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_hoBkBgf.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_i133Mfc.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_lFaQS0L.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_lsoSAFi.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_n2YSl8Q.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ntrOIw3.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_nxmLE4m.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_qxxk2Xv.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_r9cPZxQ.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_tIs0JkF.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_uJFb1kJ.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_uwh7oAV.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_vwGXJQF.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_wA2NdKL.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_wXUDs09.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_x0i8ax0.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_xD8c7xw.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_xKNxc2D.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ye04nNO.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_zy8Cvqw.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter25.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter26.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter27.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter28.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter29.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter30.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter31.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter32.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter33.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter34.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter35.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter36.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter37.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter38.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter39.ipynb
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/screenshots/29.png
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/screenshots/32.png
A  A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/screenshots/5.png
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8.ipynb
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/screenshots/11.png
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/screenshots/22.png
A  BSc_1st_Year_Physics_by_P._Balabhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/screenshots/33.png
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter1.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter10.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter11.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter12.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter13.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter14.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter15.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter2.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter3.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter4.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter5.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter6.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter7.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter8.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/Chapter9.ipynb
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/screenshots/11.png
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/screenshots/22.png
A  BSc_3rd_Year_Physics(Paper-4)_by_Sanjeeva_Rao,_Bhikshmaiah,_Ramakrishna_Reddy,_Ananta_Ramaiah/screenshots/33.png
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter01.ipynb
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter03.ipynb
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter04.ipynb
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter05.ipynb
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex3.4.png
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.4.png
A  Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.8.png
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter1.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter12.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter13.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter14.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter15.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter16.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter17.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter18.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter19.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter2.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter20.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter21.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter22.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter23.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter24.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter25.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter3.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter4.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter5.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter6.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter7.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter8.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/Chapter9.ipynb
A  Electronic_Communication_Systems_by_Roy_Blake/screenshots/Chapter12.png
A  Electronic_Communication_Systems_by_Roy_Blake/screenshots/Chapter13.png
A  Electronic_Communication_Systems_by_Roy_Blake/screenshots/chapter1.png
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER1.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER2.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER3.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER4.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER5.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER6.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER7.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./CHAPTER8.ipynb
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./screenshots/figure1.png
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./screenshots/figure2.png
A  Engineering_Mechanics:_Statics_&_Engineering_Mechanics:_Dynamics_by_Meriam,_J._L.,_&_Kraige,_L._G./screenshots/figure3.png
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_10_Moments_of_Inertia.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_11__Virtual_Work.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_12_Kinematics_o_KMlkVxo.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_13_Kinetics_of__QCPBknl.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_14_Kinetics_of__nM3MpcX.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_15_Kinetics_of__XnxZDvg.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_16_Planar_Kinem_iVoLBQW.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_17_Planar_Kinet_WgJywgt.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_18_Planar_Kinet_zX8jNLD.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_19_Planar_Kinet_mpYSt47.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_1_General_Principles.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_2_Force_Vectors.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_3_Equilibrium_o_hYESk4B.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_4_Force_System__zCBXq4n.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_5_Equilibrium_o_wA2OXD7.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_6_Structural_Analysis.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_7_Internal_Forces.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_8_Friction.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/Chapter_9_Center_of_Gra_jwxxiZg.ipynb
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/screenshots/plot1.png
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/screenshots/plot2.png
A  Engineering_Mechanics_(Statics,_Dynamics),_by_Hibler_and_Gupta/screenshots/plot3.png
A  Engineering_Mechanics_by_R.K_Bansal/chapter_1.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_11.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_12.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_13.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_14.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_15.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_16.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_17.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_18.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_2.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_20.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_3.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_4.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_5.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_6.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_7.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_8.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/chapter_9.ipynb
A  Engineering_Mechanics_by_R.K_Bansal/screenshots/bmd1.png
A  Engineering_Mechanics_by_R.K_Bansal/screenshots/sfd.png
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter10_ljUjU8j.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter11_5r7Matr.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter12.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter1_QhYeq33.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter2_GK3uH9r.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter3_18OmDFC.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter4_fMX8RWT.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter5_2AAnLS8.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter6_lGPDUWp.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter7_Ie2FcUI.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter8_vyeGLD8.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/Chapter9_4YOTRPU.ipynb
A  Introduction_to_Heat_Transfer_by_S._K._Som/screenshots/9.7_xRDyNJc.png
A  Introduction_to_Heat_Transfer_by_S._K._Som/screenshots/Ex10.7_G48Lnpj.png
A  Introduction_to_Heat_Transfer_by_S._K._Som/screenshots/Ex11.4_8WqJsrO.png
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_10_pO7WExy.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_2_FxNgKwZ.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_3_xv1zQ8m.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_4_HtsOENB.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_5_nuHXFeE.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_6_Ffb7zrN.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_7_GmkvL5A.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_8_BLulAvR.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/chapter_9_YALeeEe.ipynb
A  Strength_Of_Materials_by_S_S_Bhavikatti/screenshots/BMD_dLcLPep.JPG
A  Strength_Of_Materials_by_S_S_Bhavikatti/screenshots/SFD_1.JPG
A  Strength_Of_Materials_by_S_S_Bhavikatti/screenshots/SFD_2.JPG
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter1.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter10.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter11.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter12.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter13.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter14.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter15.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter16.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter17.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter18.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter19.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter4.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter5.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter6.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter7.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter8.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/Chapter9.ipynb
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/screenshots/Chapter4.png
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/screenshots/Chapter5.png
A  The_Elements_of_Physical_Chemistry_by_S._Glasstone/screenshots/Chapter6.png
A  "sample_notebooks/Sushovan Jena/Chapter1.ipynb"

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter01: Characterstics of Electric Motors"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_1:pg-83"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 45,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "615.2 =New speed in rpm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives  concepts and application by V.Subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_1\n",
+    "import math\n",
+    "V=500.0;# voltage v\n",
+    "N1=900.0;# speed in rpm\n",
+    "Ia1=45.0;#armature current in A\n",
+    "Ia2=21.0;#armature current in A\n",
+    "R=8;# resistance in ohm\n",
+    "Ra=1;#armature resistance in ohm\n",
+    "Eb1=V-(Ia1*Ra);\n",
+    "Eb2=V-(9*Ia2);\n",
+    "N2=N1*(Eb2/Eb1);\n",
+    "print round(N2,1),\"=New speed in rpm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_2:pg-83"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 44,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "6.93044450468 =The initial breaking torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and application by V.Subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_2\n",
+    "import math\n",
+    "V1=400.0;#supply voltage is V\n",
+    "I1=70.0;#Current in A\n",
+    "N1=78.5;#speed in rad/sec\n",
+    "R1=0.3;#resistance in ohm\n",
+    "I2=90.0;#current in A\n",
+    "N2=31.4;#Speed in rpm\n",
+    "Eb1=V1-(I1*R1);\n",
+    "T1=(Eb1*I1)/N1;\n",
+    "V2=V1+Eb1;\n",
+    "R2=(V2/I2)-R1;\n",
+    "T2=(Eb1*I2)/N1;\n",
+    "Eb2=(Eb1*N2)/N1;\n",
+    "I=(V1+Eb2)/R2;\n",
+    "T=(Eb2+I)/N2;\n",
+    "print T,\"=The initial breaking torque in Nm \"\n",
+    "#Calculation error in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_3:pg-84"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "7.68541150479 =External resistance required in ohm\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric drives concepts and application by V.Subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_3\n",
+    "import math\n",
+    "V=250.0;#supply voltage V\n",
+    "Ia1=40.0;#Armature current in A\n",
+    "R1=0.6;#Resistance in ohm\n",
+    "N1=2.828;#speed in rpm\n",
+    "N2=2;#speed in rpm\n",
+    "Ia2=((Ia1)**2/N1)**(1.0/2);\n",
+    "Eb1=V-(Ia1*R1);\n",
+    "Eb=(Ia1/Ia2)*N2;\n",
+    "Eb2=Eb1/Eb;\n",
+    "R2=(V-Eb2)/Ia2;\n",
+    "print R2,\"=External resistance required in ohm\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_4a:pg-85"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "9.09764027943 =the effeciency of the motor in % \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_4a\n",
+    "import math\n",
+    "V=440.0;# voltage in V\n",
+    "Ia=80.0;# Current in A\n",
+    "Na=1200.0;#Speed in rpm\n",
+    "Na1=125.6;# Speed in rad/sec\n",
+    "R1=0.55;# Resistance in ohm\n",
+    "R2=110.0;# Resistance in ohm\n",
+    "N0=600.0;# Speed in rpm\n",
+    "N01=62.8;#Speed in rpm\n",
+    "Nf=300.0;# Speed in rpm\n",
+    "Nf1=31.4;# Speed in rpm\n",
+    "Rsh=1.256;# Resistance in ohm\n",
+    "E=V-(Ia*R1);\n",
+    "K=E/Na1; \n",
+    "E1=K*N01;\n",
+    "Tf=K*Ia;\n",
+    "E2=E1*(Nf/N0);\n",
+    "V2=E2+(Ia*R1);\n",
+    "Is=(V2/Rsh)+Ia;\n",
+    "Il=Is+(V/R2);\n",
+    "Pi=V*Il;\n",
+    "Po=Tf*Nf1;\n",
+    "Eff=(Po/Pi)*100;\n",
+    "print Eff,\"=the effeciency of the motor in % \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_4b:pg-86"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "999.450641681 =No load speed in rpm \n",
+      "230.176511417 =Full load speed in rpm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_4b\n",
+    "import math\n",
+    "V=440.0;#voltage in V\n",
+    "K=3.153;\n",
+    "Ia=80.0;# Current in A\n",
+    "Rs=2.0;#Resistance in ohm\n",
+    "Rsh=1.5;#Resistance in ohm\n",
+    "R1=0.55;#Resistance in ohm\n",
+    "Alpha=(Rs/Rsh);\n",
+    "Vo=(V/Alpha);\n",
+    "No=(Vo/K);\n",
+    "N=((60.0*No)/(2*math.pi));\n",
+    "print N,\"=No load speed in rpm \"\n",
+    "V2=((V/Rs)-Ia)/((1/Rs)+(1/Rsh));\n",
+    "E2=V2-(Ia*R1);\n",
+    "N2=N*(E2/Vo);\n",
+    "print N2,\"=Full load speed in rpm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_5a:pg-87"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 46,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "898.56 =The speed of the motor in rpm \n",
+      "99.4718394324 =The torque developed in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_5a\n",
+    "import math\n",
+    "V=250;# voltage in V\n",
+    "Ra=0.4;# Resistance in ohm\n",
+    "Na=480;#Speed in rpm\n",
+    "Va=125;# voltage in V\n",
+    "Ia=40;#Current in A\n",
+    "Vi=V-(Ra*Ia);\n",
+    "N=Na*(Vi/Va);\n",
+    "print N,\"=The speed of the motor in rpm \"\n",
+    "N1=(2*math.pi*N)/60;\n",
+    "T=(Vi*Ia)/N1;\n",
+    "print T,\"=The torque developed in Nm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_5b:pg-87"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 47,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "2.725 =The value of resistance in ohm\n",
+      "99.4718394324 =The torque developed in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_5b\n",
+    "import math\n",
+    "V=250.0;# voltage in V\n",
+    "I=40.0;#Current in A\n",
+    "Ra=0.4;#Resistance in ohm\n",
+    "Eb=125.0;# voltage in V\n",
+    "Na=480.0;#Speed in rpm\n",
+    "Re=(V-Eb-(I*Ra))/I;\n",
+    "print Re,\"=The value of resistance in ohm\"\n",
+    "T=(Eb*I)*60/(2*Na*math.pi);\n",
+    "print T,\"=The torque developed in Nm \"\n",
+    "#Result vary due to error in calculation of torque in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_6:pg-87"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 48,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "480.763116057 =The speed of motor in rpm \n",
+      "3.82460039115 =The torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_6\n",
+    "import math\n",
+    "V=250.0;# voltage in V\n",
+    "I=40.0;#Current in A\n",
+    "R1=2.725;# Resistance in ohm\n",
+    "R2=3.5;# Resistance in ohm\n",
+    "Rf=0.15;# Resistance in ohm\n",
+    "N=480.0;#Speed in rpm\n",
+    "V1=V-I*(R1+Rf);\n",
+    "Ir=(V1/R2);\n",
+    "Ia=I-Ir;\n",
+    "Eb=V1-(Ia*Rf);\n",
+    "Nm=N*(V1/Eb);\n",
+    "print Nm,\"=The speed of motor in rpm \"\n",
+    "#Result vary due to 125V is used instead of 135V in the textbook\n",
+    "T=(Eb*Ia)/(2*math.pi*Nm/60);\n",
+    "print T,\"=The torque in Nm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_7:pg-87"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 49,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "242.984096386 =The speed of the motor in rpm \n",
+      "99.4718394324 =The torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_7\n",
+    "import math\n",
+    "V=250;# voltage in V\n",
+    "I=40;#Current in A\n",
+    "Ro=0.4;# Resistance in ohm\n",
+    "R1=2.725;# Resistance in ohm\n",
+    "R2=3.5;# Resistance in ohm\n",
+    "Eb=125;# voltage in V\n",
+    "Na=480;#Speed in rpm\n",
+    "Na1=50.24;#Speed in rad/sec\n",
+    "R=((1/R1)+(1/R2));\n",
+    "Vm=(V-(I*R1))/(R*R1);\n",
+    "Em=Vm-(I*Ro);\n",
+    "N=(Em/Eb)*Na;\n",
+    "print N,\"=The speed of the motor in rpm \"\n",
+    "N1=(2*math.pi*N)/60;\n",
+    "Il=(V-Vm)/R1;\n",
+    "Po=Em*I;\n",
+    "T=Po/N1;\n",
+    "print T,\"=The torque in Nm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_8:pg-89"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 50,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "-84.7104 =The speed in rpm \n",
+      "164.128535064 =The torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_8\n",
+    "import math\n",
+    "V=250.0;# voltage in V\n",
+    "I=40.0;#Current in A\n",
+    "R1=0.91;# Resistance in ohm\n",
+    "Rs=0.95;# Resistance in ohm\n",
+    "Eb=125.0;# voltage in V\n",
+    "N1=480.0;#Speed in rpm\n",
+    "Vm=Rs*I;\n",
+    "Ia=I-((V-Vm)/2);\n",
+    "Em=-Vm-(Ia*R1);\n",
+    "N=-(Em/Eb)*N1;\n",
+    "print N,\"=The speed in rpm \"\n",
+    "N2=(2*math.pi*N)/60;\n",
+    "T=(Em*Ia)/N2;\n",
+    "print T,\"=The torque in Nm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_10:pg-90"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 51,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "2.56 =Direct on line starting torque in Nm \n",
+      "0.853333333333 =By Star/delta starter\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_10\n",
+    "import math\n",
+    "Sf=0.04;#Full load slip in %\n",
+    "Ist=1.0;#Starting current in A\n",
+    "If1=Ist/8.0;\n",
+    "T=(8.0)**2*Sf;\n",
+    "print T,\"=Direct on line starting torque in Nm \"\n",
+    "S=T/3;\n",
+    "print S,\"=By Star/delta starter\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_11:pg-90"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 52,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1.28 =Torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_11\n",
+    "import math\n",
+    "Sf1=0.04;#Full load slip in %\n",
+    "x=(8.0*3)**(1.0/2);\n",
+    "Tst=(x)**2*Sf1;\n",
+    "S=Sf1/2.0;\n",
+    "T=(8)**2*S;\n",
+    "print T,\"=Torque in Nm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_12:pg-91"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 53,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.16 =Torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_12\n",
+    "import math\n",
+    "Sf=0.04;#Full load slip in %\n",
+    "I=5;#Current in A\n",
+    "Tst=(I)**2*Sf;\n",
+    "x=((2.0/I)*100)**(1.0/2);\n",
+    "T=(2.0/I)**2*(I)**2*Sf;\n",
+    "print T,\"=Torque in Nm \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex1_13:pg-92"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 54,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(6.53+2.08j) =The impedence of motor \n",
+      "(1.0675+2.08j) =The impedence at plugging \n",
+      "77019.1732775 =The braking torque in Nm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex1_13\n",
+    "import math\n",
+    "V=500.0;#Voltage in V\n",
+    "r1=0.13;#resistance in ohm\n",
+    "r2=0.32;#resistance in ohm\n",
+    "x1=0.6j;#reactance in ohm\n",
+    "x2=1.48j;#reactance in ohm\n",
+    "rm=250.0;#resistance in ohm\n",
+    "xm=20;#reactance in ohm\n",
+    "S=0.05;#Full load slip in %\n",
+    "Z2=r1+x1+(r2/S)+x2;\n",
+    "print Z2,\"=The impedence of motor \"\n",
+    "I2=(V/(math.sqrt(3.0)*(6.853)));\n",
+    "T1=3*(I2)**2*(r2/S);\n",
+    "Sb=2-S;\n",
+    "Sf=2-S+r1;\n",
+    "Zb=r1+x1+(Sb/Sf)+x2;\n",
+    "print Zb,\"=The impedence at plugging \"\n",
+    "I=(V/(math.sqrt(3.0)*(2.336)));\n",
+    "T2=3*(I)**2.0*(Sb/Sf);\n",
+    "T=T1+T2;\n",
+    "print T,\"=The braking torque in Nm \"\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter03.ipynb b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter03.ipynb
new file mode 100644
index 00000000..add9d188
--- /dev/null
+++ b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter03.ipynb
@@ -0,0 +1,690 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter03: Converters for Feeding Electric Motors"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_1:pg-273"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "81.2623533876 =Current in the load in A \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_1\n",
+    "import math\n",
+    "Rd=2;#Resistance in ohm\n",
+    "Eb=150;#Back emf in V\n",
+    "Vs=400;#Supply voltage in V\n",
+    "Alpha=0.52;#angle in radian\n",
+    "Vdia=((2*math.sqrt(2)*Vs*math.cos(Alpha))/math.pi);\n",
+    "Id=(Vdia-Eb)/Rd;\n",
+    "Irms=Id/math.sqrt(2);\n",
+    "print Id,\"=Current in the load in A \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_2:pg-273"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "88.1286627695 =The firing angle in degree \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_2\n",
+    "import math\n",
+    "Vs=400;#Supply voltage in V\n",
+    "Id=80.88;#Current in A\n",
+    "Rd=2;#Resistance in ohm\n",
+    "Eb=-150;#Back emf in V\n",
+    "Vdia=Id*Rd+Eb;\n",
+    "a=math.acos((Vdia*math.pi)/(2*math.sqrt(2)*Vs));\n",
+    "Alpha=(a*180)/math.pi;\n",
+    "print Alpha,\"=The firing angle in degree \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_3:pg-274"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "5.19163041855 =The overlap angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_3\n",
+    "import math\n",
+    "Id=80.88;#Current in A\n",
+    "Rd=2;#Resistance in ohm\n",
+    "Xc=0.628;#Reactance in ohm\n",
+    "Vs=400;#Supply voltage in V\n",
+    "Eb=150;#Back emf in V\n",
+    "Z=Id*(Rd+(Xc/math.pi));\n",
+    "a=math.acos((Z-Eb)/(0.9*Vs));\n",
+    "Alpha=(a*180)/math.pi;\n",
+    "c=math.cos(Alpha);\n",
+    "d=-c/11;\n",
+    "b=(Id*Xc*2)/(math.pi*Vs);\n",
+    "X=d-b;\n",
+    "e=math.acos(X);\n",
+    "f=(e*180)/math.pi;\n",
+    "u=f-Alpha;\n",
+    "print u,\"=The overlap angle in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_4:pg-275"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "7.10947929815 =The average value of dc current in A \n",
+      "88.8684912269 =The average value of converter voltage in V \n",
+      "0.745818730364 =The overlap angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_4\n",
+    "import math\n",
+    "Vs=200.0;#Supply voltage in V\n",
+    "Rd=12.5;#Resistance in ohm\n",
+    "Xc=0.5;#Reactance in ohm\n",
+    "pf=0.5;#Powerfactor\n",
+    "Vdia=0.9*Vs*pf;\n",
+    "Id=Vdia/(Rd+(Xc/math.pi));\n",
+    "print Id,\"=The average value of dc current in A \"\n",
+    "Vd=Id*Rd;\n",
+    "print Vd,\"=The average value of converter voltage in V \"\n",
+    "Vc=Vdia-Vd;\n",
+    "X=pf-((Vc*2.0)/Vs);\n",
+    "c=math.acos(X);\n",
+    "d=(c*180.0)/math.pi;\n",
+    "u=d-60;\n",
+    "print u,\"=The overlap angle in deg \"\n",
+    "#Result vary due to error in calculation of overlap angle in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_5:pg-276"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "56.5714285714 =The average value of load current in A \n",
+      "64.6230664748 =The overlap angle u in deg \n",
+      "35.1257218105 =The overlap angle u1 in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_5\n",
+    "import math\n",
+    "f=50.0;#Frequency in Hz\n",
+    "Rd=2.5;#Resistance in ohm\n",
+    "Lc=0.005;#Inductance in mH\n",
+    "Vs=220.0;#Supply voltage in V\n",
+    "pf=1;#Powerfactor\n",
+    "pf1=0.866;#Powerfactor\n",
+    "Xc=2*math.pi*f*Lc;\n",
+    "Z=Rd+((2*Xc)/math.pi);\n",
+    "Vdia=0.9*Vs*pf;\n",
+    "Id=Vdia/Z;\n",
+    "print Id,\"=The average value of load current in A \"\n",
+    "Vd=Id*Rd;\n",
+    "Vdc=Vdia-Vd;\n",
+    "a=(1-((Vdc*2)/Vdia));\n",
+    "b=math.acos(a);\n",
+    "u=(b*180.0)/math.pi;\n",
+    "print u,\"=The overlap angle u in deg \"\n",
+    "Vdia1=0.9*Vs*pf1;\n",
+    "Id1=Vdia1/Z;\n",
+    "Vd1=Id1*Rd;\n",
+    "Vdc1=Vdia1-Vd1;\n",
+    "V=pf1-((Vdc1*2)/Vs);\n",
+    "c=math.acos(V);\n",
+    "d=(c*180.0)/math.pi;\n",
+    "u1=d-30;\n",
+    "print u1,\"=The overlap angle u1 in deg \"\n",
+    "#Result vary due to error in calculation of overlap angle in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_6:pg-277"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "3.57960292596 =The overlap angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_6\n",
+    "import math\n",
+    "Vs=220.0;#Supply voltage in V\n",
+    "f=50.0;#Frequency in Hz\n",
+    "Eb=-200.0;#Back emf in V\n",
+    "Rd=3.0;#Resistance in ohm\n",
+    "Vdc=200.0;# voltage in V\n",
+    "Xc=0.314;#Reactance in ohm\n",
+    "L=0.001;#Inductance in mH\n",
+    "pf=-0.5;#Powerfactor\n",
+    "Vdia=0.9*Vs*pf;\n",
+    "Id=(Vdia-Eb)/(Rd+((2*Xc)/math.pi));\n",
+    "Vd=Id*Rd+Eb;\n",
+    "a=-pf+((Vd*2)/Vdc);\n",
+    "b=math.acos(a);\n",
+    "c=(b*180.0)/math.pi;\n",
+    "u=c-120;\n",
+    "print u,\"=The overlap angle in deg \"\n",
+    "#Result vary due to error in calculation of overlap angle in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_7:pg-278"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "8.86857843179 =the overlap angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_7\n",
+    "import math\n",
+    "Id=50.0;#Current in A\n",
+    "Vs=220.0;#Supply voltage in V\n",
+    "Vdio=257.4;# voltage in V\n",
+    "f=50.0;#Frequency in Hz\n",
+    "L=0.0015;#Inductance in mH\n",
+    "pf=0.866;#Powerfactor \n",
+    "Xc=2*math.pi*f*L;\n",
+    "Vdia=1.17*Vs*pf;\n",
+    "Vd=Vdia-((3*Id*Xc)/(2*math.pi));\n",
+    "Vc=Vdia-Vd;\n",
+    "a=pf-((Vc*2)/Vdio);\n",
+    "b=math.acos(a);\n",
+    "c=(b*180.0)/math.pi;\n",
+    "u=c-30;\n",
+    "print u,\"=the overlap angle in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_8:pg-280"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "64.9 =load current in A \n",
+      "20.6382 =Average value of load current in A \n",
+      "35.7464109768 =Rms value of load current in A \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_8\n",
+    "import math\n",
+    "Rd=2.5;#Resistance in ohm\n",
+    "V=250;# voltage in V\n",
+    "f=50;#Frequency in Hz\n",
+    "Vs=150;#Supply voltage in V\n",
+    "pf=-0.5;#Powerfactor\n",
+    "Eb=-250;#Back emf in V\n",
+    "Xc=0.636;#Reactance in ohm\n",
+    "Vdia=1.17*Vs*pf;\n",
+    "Id=(Vdia-Eb)/Rd;\n",
+    "print Id,\"=load current in A \"\n",
+    "Ith=(Id*Xc)/2;\t\n",
+    "print Ith,\"=Average value of load current in A \"\n",
+    "Irms=math.sqrt(3)*Ith;\n",
+    "print Irms,\"=Rms value of load current in A \"\n",
+    "#Result vary due to error in calculation of current in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_9:pg-280"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "26.8325105187 =The overlap angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_9\n",
+    "import math\n",
+    "L=0.003;#Inductance in mH\n",
+    "Id=64.9;#Current in A\n",
+    "V=162.25;#voltage in V\n",
+    "Vs=150;#Supply voltage in V\n",
+    "f=50;#Frequency in Hz\n",
+    "Rd=2.5;#Resistance in ohm\n",
+    "Eb=-250;#Back emf in V\n",
+    "pf=-0.5;#Powerfactor\n",
+    "Xc=2*math.pi*f*L;\n",
+    "Vdia=(Id*(Rd+((3*Xc)/(2*math.pi))))+Eb;\n",
+    "a=Vdia/(1.17*Vs);\n",
+    "b=math.acos(a);\n",
+    "c=(b*180)/math.pi;\n",
+    "Alpha=-0.3338;#angle in radian\n",
+    "X=(3*Id*Xc)/(math.pi*Vs);\n",
+    "d=math.acos(Alpha-X);\n",
+    "e=(d*180)/math.pi;\n",
+    "u=e-c;\n",
+    "print u,\"=The overlap angle in deg \"\n",
+    "#Result vary due to error in calculation of overlap angle in the textbook\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_10:pg-280"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "139.752 =Average value of load voltage in V \n",
+      "9.3168 =Average value of load current in A \n",
+      "1302.0414336 =Power dissipation in W \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_10\n",
+    "import math\n",
+    "Vs=400;#Supply voltage in V\n",
+    "f=50;#Frequency in Hz\n",
+    "Rd=15;#Resistance in ohm\n",
+    "pf=0.2588;#Powerfactor\n",
+    "Vdia=1.35*Vs*pf;\n",
+    "print Vdia,\"=Average value of load voltage in V \"\n",
+    "Id=Vdia/Rd;\n",
+    "print Id,\"=Average value of load current in A \"\n",
+    "P=Vdia*Id;\t\n",
+    "print P,\"=Power dissipation in W \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_11:pg-281"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.24450211813 =The power factor \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_11\n",
+    "import math\n",
+    "Alpha=75;#angle in degree\n",
+    "a=math.cos(Alpha);\n",
+    "b=a/3.6;\n",
+    "pf=(3*b)/math.pi;\n",
+    "print pf,\"=The power factor \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_12:pg-281"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "20.7850558657 =The max current in A \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_12\n",
+    "import math\n",
+    "Vs=400;#Supply voltage in V\n",
+    "Id=9.317;#Current in A\n",
+    "pf=0.2588;#Powerfactor\n",
+    "Vth=math.sqrt(2)*Vs;\n",
+    "Ia=math.sqrt(2/3.0)*Id;\n",
+    "Ith=Ia/math.sqrt(2);\n",
+    "Imax=Ith/pf;\n",
+    "print Imax,\"=The max current in A \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_14:pg-282"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1.0 =Ripple factor \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_14\n",
+    "import math\n",
+    "t0=1.5;#Time in ms\n",
+    "t1=3;#Time in ms\n",
+    "Vs=200.0;#Supply voltage in V\n",
+    "gama=t0/t1;\n",
+    "Vl=gama*Vs;\n",
+    "Vrms=math.sqrt(gama)*Vs;\n",
+    "Rf=(math.sqrt(1-gama))/(math.sqrt(gama));\n",
+    "print Rf,\"=Ripple factor \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_14:pg-283"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1.0 =Ripple factor \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_14\n",
+    "import math\n",
+    "t0=1.5;#Time in ms\n",
+    "t1=3;#Time in ms\n",
+    "Vs=200.0;#Supply voltage in V\n",
+    "gama=t0/t1;\n",
+    "Vl=gama*Vs;\n",
+    "Vrms=math.sqrt(gama)*Vs;\n",
+    "Rf=(math.sqrt(1-gama))/(math.sqrt(gama));\n",
+    "print Rf,\"=Ripple factor \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex3_15:pg-284"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "23.032 =Maximum current in A \n",
+      "23.032 =Minimum current in A \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex3_15\n",
+    "import math\n",
+    "R=1.5;#Resistance in ohm\n",
+    "L=3;#Inductance in H\n",
+    "Ton=2;#Time in ms\n",
+    "T=6;#Time in ms\n",
+    "Vs=150.0;#Supply voltage in V\n",
+    "t=Ton/T;\n",
+    "tON=L/R;\n",
+    "Vavg=T*Vs;\n",
+    "Iavg=Vavg/R;\n",
+    "P=(Iavg)**2*R;\n",
+    "Io=23.032;\n",
+    "I=1-math.exp(-t);\n",
+    "I1=Io*math.exp(-t);\n",
+    "Imax=(Vs/R)*I+I1;\n",
+    "print Imax,\"=Maximum current in A \"\n",
+    "Imin=Imax*math.exp(-2*t);\n",
+    "print Imin,\"=Minimum current in A \"\n",
+    "\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter04.ipynb b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter04.ipynb
new file mode 100644
index 00000000..a32d3adb
--- /dev/null
+++ b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter04.ipynb
@@ -0,0 +1,622 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter04: Control of Electric Motors"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_1:pg-441"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "29.9336056693 =Iavg:\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_1\n",
+    "import math\n",
+    "Eb=50;# voltage in V\n",
+    "V=120;# voltage in V\n",
+    "f=50;#frequency in Hz\n",
+    "R=10;# Resistance in ohm\n",
+    "a=math.asin(Eb/(math.sqrt(2)*V));\n",
+    "Alpha=(a*180)/math.pi;\n",
+    "pf=0.9556;\n",
+    "Iavg=(1/(2*math.pi*R))*((2*math.sqrt(2)*V*pf)-(Eb*(math.pi-(2*Alpha))));\n",
+    "print Iavg,\"=Iavg:\"\n",
+    "#answer wrong in the textbook due to error in calculation\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_3:pg-442"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "81.1519777932 =Effeciency in % \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_3\n",
+    "import math\n",
+    "P=10000;\n",
+    "V=240;# voltage in V\n",
+    "N=1000;#Speed in rpm\n",
+    "Eff1=0.87;#Effeciency in %\n",
+    "Vs=250;# voltage in V\n",
+    "f=50;#frequency in Hz\n",
+    "Alpha=0.5;#angle\n",
+    "R=0.40;# Resistance in ohm\n",
+    "Fdf=1;#fundamental displacement factor\n",
+    "df=0.9;#distortion factor\n",
+    "pf=0.9;#the power factor\n",
+    "Pi=P/Eff1;\n",
+    "I=Pi/V;\n",
+    "Eb=V-(I*R);\n",
+    "Vi=0.9*Vs;\n",
+    "Eb1=Vi-(I*R);\n",
+    "N1=(Eb1/Eb)*N;\n",
+    "Pi1=V*I*pf*(10)**(-3);\n",
+    "Pi2=(Pi1*N1)/N;\n",
+    "Vc=0.9*Vs*Alpha;\n",
+    "Eb2=Vc-(I*R);\n",
+    "N2=(N*Eb2)/Eb;\n",
+    "P0=((Pi1*N2)/N)*1000;\n",
+    "Pi0=Vc*I;\n",
+    "Eff=(P0/Pi0)*100;\n",
+    "print Eff,\"=Effeciency in % \"\n",
+    "#Result vary due to roundoff error\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_4:pg-442"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.7794 =powerfactor \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_4\n",
+    "import math\n",
+    "V=250;# voltage in V\n",
+    "f=50;#frequency in Hz\n",
+    "R=1.5;# Resistance in ohm\n",
+    "L=30;#inductance in mH\n",
+    "Eb=100;#Back emf in V\n",
+    "Alpha=0.866;#angle \n",
+    "Vc=0.9*V*Alpha;\n",
+    "Id=(Vc-Eb)/R;\n",
+    "P=Vc*Id*10**(-3);\n",
+    "pf=0.9*Alpha;\n",
+    "print pf,\"=powerfactor \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_5:pg-443"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "57.4863853668 =The firing angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_5\n",
+    "import math\n",
+    "N=1800;#Speed in rpm\n",
+    "I=60;#Current in A\n",
+    "V=400;# voltage in V\n",
+    "E=185;#Back emf in V\n",
+    "N2=900;#Speed in rpm\n",
+    "R=0.5;# Resistance in ohm\n",
+    "Vs=V/2.34;\n",
+    "Vl=V/1.35;\n",
+    "Vi=V-(I*R);\n",
+    "V=E+(I*R);\n",
+    "a=math.acos(V/(2.34*Vs));\n",
+    "Alpha=(a*180)/math.pi;\n",
+    "print Alpha,\"=The firing angle in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_6:pg-444"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "71.5063230096 =The firing angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_6\n",
+    "import math\n",
+    "V=500;# voltage in V\n",
+    "Vs=250;# voltage in V\n",
+    "I=181;#Current in A\n",
+    "N=1500;#Speed in rpm\n",
+    "R=0.1;# Resistance in ohm\n",
+    "f=50;#frequency in Hz\n",
+    "Eb=Vs-(I*R);\n",
+    "Eb1=Eb/3;\n",
+    "A1=math.acos(Vs/(1.35*V));\n",
+    "Alpha1=(A1*180)/math.pi;\n",
+    "Ia2=I/9;\n",
+    "V2=Eb1+(Ia2*R);\n",
+    "A2=math.acos(V2/(1.35*V));\n",
+    "Alpha2=(A2*180)/math.pi;\n",
+    "Vl=Vs/1.35;\n",
+    "A3=math.acos(V2/(1.35*Vl));\n",
+    "Alpha3=(A3*180)/math.pi;\n",
+    "print Alpha3,\"=The firing angle in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_7a:pg-445"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "26.2447091004 =The firing angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_7a\n",
+    "import math\n",
+    "V=300;# voltage in V\n",
+    "Vt=363.25;# voltage in V\n",
+    "f=60;#frequency in Hz\n",
+    "Rd=0.02;# Resistance in ohm\n",
+    "La=0.002;#inductance in H\n",
+    "Id=500;#Current in A\n",
+    "N=1500;#Speed in rpm\n",
+    "Eb=Vt-(Id*Rd);\n",
+    "A=math.acos(Vt/(1.35*V));\n",
+    "Alpha=(A*180)/math.pi;\n",
+    "print Alpha,\"=The firing angle in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_7b:pg-445"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "173.25 =The back emf in V \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_7b\n",
+    "import math\n",
+    "V=300;# voltage in V\n",
+    "Vt=363.25;# voltage in V\n",
+    "f=60;#frequency in Hz\n",
+    "Rd=0.02;# Resistance in ohm\n",
+    "La=0.001;#inductance in H\n",
+    "Id=500;#Current in A\n",
+    "N=1500;#Speed in rpm\n",
+    "Xc=2*math.pi*f*La;\n",
+    "Z=Rd+((3*Xc)/math.pi);\n",
+    "Eb=Vt-(Id*Z);\n",
+    "print Eb,\"=The back emf in V \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_8:pg-446"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.479515813953 =The constant A \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_8\n",
+    "import math\n",
+    "V=600;# voltage in V\n",
+    "R=0.16;# Resistance in ohm\n",
+    "Ia=210;#Current in A\n",
+    "N=600;#Speed in rpm\n",
+    "n=10;#no of unit\n",
+    "Eb=V-(Ia*R);\n",
+    "Td=((Eb*Ia)/(2*math.pi*n));\n",
+    "W=(2*math.pi*N)/60;\n",
+    "A=Td/(W)**2;\n",
+    "print A,\"=The constant A \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_9:pg-447"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "360.0 =The back emf in V \n",
+      "139.321363317 =The firing angle1 in deg \n",
+      "98.1111258306 =The firing angle2 in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_9\n",
+    "import math\n",
+    "V1=500;# voltage in V\n",
+    "V2=450;# voltage in V\n",
+    "Vs=420;# voltage in V\n",
+    "V=400;# voltage in V\n",
+    "I=60;#Current in A\n",
+    "R=1.5;# Resistance in ohm\n",
+    "R1=5;# Resistance in ohm\n",
+    "Eb=20;#Back emf in V\n",
+    "f=50;#frequency in Hz\n",
+    "Vl=V2+Eb;\t\t\n",
+    "A=math.acos(Vl/(1.35*Vs));\n",
+    "Alpha1=(A*180)/math.pi;\n",
+    "Eb1=V2-(I*R);\n",
+    "print Eb1,\"=The back emf in V \"\n",
+    "V3=-V2-(I*R);\n",
+    "Vc=-V2+Eb;\n",
+    "A1=math.acos(Vc/(1.35*Vs));\n",
+    "Alpha2=(A1*180)/math.pi;\n",
+    "print Alpha2,\"=The firing angle1 in deg \"\n",
+    "Eb2=-V-(I*R);\n",
+    "Vc1=-V+Eb+(R1*I);\n",
+    "A2=math.acos(Vc1/(1.35*Vs));\n",
+    "Alpha3=(A2*180)/math.pi;\n",
+    "print Alpha3,\"=The firing angle2 in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_10:pg-448"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.1 =The inductance in Henry \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_10\n",
+    "import math\n",
+    "V=500.0;# voltage in V\n",
+    "I=15.0;#Current in A\n",
+    "t=0.6;#time in sec\n",
+    "f=80;#frequency in Hz\n",
+    "Vav=V*t;\n",
+    "Vi=V-Vav;\n",
+    "Ton=t/f;\n",
+    "L=Vi*(Ton/I);\n",
+    "print L,\"=The inductance in Henry \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_14:pg-449"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.8 =The time ratio \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_14\n",
+    "import math\n",
+    "V=440;# voltage in V\n",
+    "R1=0.07;# Resistance in ohm\n",
+    "R2=0.05;# Resistance in ohm\n",
+    "X=0.2;#Reactance in ohm\n",
+    "N=1420;#Speed in rpm\n",
+    "Xm=20;#Reactance in ohm\n",
+    "S1=80;#slip in rpm\n",
+    "S2=500;#slip in rpm\n",
+    "Ra=((S2/S1)*R2)-R2;\n",
+    "R=2*Ra;\n",
+    "Ra1=4*R2;\n",
+    "T=(Ra1*2)/R;\n",
+    "print T,\"=The time ratio \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_15:pg-450"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "115.887603041 =The firing angle in deg \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_15\n",
+    "import math\n",
+    "P=1000;\n",
+    "N=1500;#Speed in rpm\n",
+    "R2=0.06;# Resistance in ohm\n",
+    "I2=125.6;#Current in A\n",
+    "T=1.5;#Time in sec\n",
+    "N1=1420;#Speed in rpm\n",
+    "S=(R2*P)/N;\n",
+    "K=((S/(2*math.pi*N))*(I2)**2*T)/(N1)**2;\n",
+    "T1=K*(N1)**2;\n",
+    "N2=750;#Speed in rpm\n",
+    "S0=0.489;#No load slip\n",
+    "S2=1.12;#load slip\n",
+    "T2=K*(N2)**2;\n",
+    "X1=(T2*S)/T1;\n",
+    "A=math.acos(-S0/S2);\n",
+    "Alpha=(A*180)/math.pi;\n",
+    "print Alpha,\"=The firing angle in deg \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex4_20:pg-452"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "984.782608696 =The speed N1 in rpm \n",
+      "968.47826087 =The speed N2 in rpm \n",
+      "946.739130435 =The speed N3 in rpm \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex4_20\n",
+    "import math\n",
+    "R=0.05;# Resistance in ohm\n",
+    "N0=1000.0;#Speed in rpm\n",
+    "Rf=46.0;# Resistance in ohm\n",
+    "I1=75.0;#Current in A\n",
+    "I2=150;#Current in A\n",
+    "I3=250.0;#Current in A\n",
+    "V=230;# voltage in V\n",
+    "Eb=230;#Back emf in V\n",
+    "If=V/Rf;\n",
+    "Ia1=I1-If;\n",
+    "Eb1=V-(Ia1*R);\n",
+    "N1=(Eb1/Eb)*N0;\n",
+    "print N1,\"=The speed N1 in rpm \"\n",
+    "Ia2=I2-If;\n",
+    "Eb2=V-(Ia2*R);\n",
+    "N2=(Eb2/Eb)*N0;\n",
+    "print N2,\"=The speed N2 in rpm \"\n",
+    "Ia3=I3-If;\n",
+    "Eb3=V-(Ia3*R);\n",
+    "N3=(Eb3/Eb)*N0;\n",
+    "print N3,\"=The speed N3 in rpm \"\n",
+    "\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter05.ipynb b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter05.ipynb
new file mode 100644
index 00000000..ddf487e0
--- /dev/null
+++ b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/Chapter05.ipynb
@@ -0,0 +1,162 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 5:Rating and Heating of Motors"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex5.1:pg-491"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "43.606211467  is The final temperature in deg\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Example:5.1\n",
+    "import math\n",
+    " \n",
+    "theta1=60;#Temperature rise of motor in degree\n",
+    "theta2=40.0;#Temperature rise of motor in degree\n",
+    "e=0.5;#exponential value\n",
+    "I1=110.0;#current in A\n",
+    "I2=125;#current in A\n",
+    "t1=4;#Time in hour\n",
+    "t2=8;#Time in hour\n",
+    "theta=theta1/theta2;\n",
+    "tough=-(1/math.log(0.5));\n",
+    "thetam1=theta2/e;\n",
+    "thetam2=thetam1*(I2/I1)**2;\n",
+    "x=t1/(theta1*tough);\n",
+    "a=math.e**-x;\n",
+    "y=t2/(theta1*tough);\n",
+    "b=math.e**-y;\n",
+    "thetam=I2*((1-a)/(1-(a*b)));\n",
+    "print thetam,\" is The final temperature in deg\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex5.2:pg-492"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1.23972921698  is The permissible overloading \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex5_2\n",
+    "import math\n",
+    " \n",
+    "T=100.0;#Temperature rise of motor in degree\n",
+    "t1=2;#Time in hour\n",
+    "t2=1.5;#Time in hour\n",
+    "Alpha=0.5;#Angle in rad\n",
+    "e=math.e**(-t1/t2);\n",
+    "thetam=100.0/(1-e);\n",
+    "t=thetam/T;\n",
+    "x=math.sqrt((t*(Alpha+1))-Alpha);\n",
+    "print x,\" is The permissible overloading \"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex5.3:pg-493"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1.071304005 is The permissible overloading of the motor \n"
+     ]
+    }
+   ],
+   "source": [
+    "#Electric Drives:concepts and applications by V.subrahmanyam\n",
+    "#Publisher:Tata McGraw-Hill \n",
+    "#Edition:Second \n",
+    "#Ex5_3\n",
+    "import math\n",
+    " \n",
+    "Alpha=0.4;#Angle in rad\n",
+    "T1=100;#Temperature rise of motor in degree\n",
+    "T2=150.0;#Temperature rise of motor in degree\n",
+    "P=125.0;#Power in KW\n",
+    "t1=15;#Time in hour\n",
+    "t2=30.0;#Time in hour\n",
+    "x=-t1/T1;\n",
+    "a=math.e**x;\n",
+    "y=-t2/T2;\n",
+    "b=math.e**y;\n",
+    "p=math.sqrt(((Alpha+1)*(1-(a*b)))/(1-a)-Alpha);\n",
+    "print p,\"is The permissible overloading of the motor \"\n",
+    "\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex3.4.png b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex3.4.png
new file mode 100644
index 00000000..26fa3a1f
--- /dev/null
+++ b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex3.4.png
diff --git a/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.4.png b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.4.png
new file mode 100644
index 00000000..b51d7355
--- /dev/null
+++ b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.4.png
diff --git a/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.8.png b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.8.png
new file mode 100644
index 00000000..a07914ca
--- /dev/null
+++ b/Electric_Drives_Concepts_And_Applications_by_Vedam_Subrahmanyam/screenshots/Ex4.8.png