initial commit / add all books

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diff --git a/3472/CH44/EX44.1/Example44_1.sce b/3472/CH44/EX44.1/Example44_1.sce
new file mode 100644
index 000000000..ce86b46df
--- /dev/null
+++ b/3472/CH44/EX44.1/Example44_1.sce
@@ -0,0 +1,54 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 6: MOTORS FOR ELECTRIC TRACTION

+

+// EXAMPLE : 6.1 :

+// Page number 788

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+I_1 = 10.0    // Current(A)

+T_1 = 54.0    // Torque(N-m)

+I_2 = 20.0    // Current(A)

+T_2 = 142.0   // Torque(N-m)

+I_3 = 30.0    // Current(A)

+T_3 = 250.0   // Torque(N-m)

+I_4 = 40.0    // Current(A)

+T_4 = 365.0   // Torque(N-m)

+I_5 = 50.0    // Current(A)

+T_5 = 480.0   // Torque(N-m)

+I_6 = 60.0    // Current(A)

+T_6 = 620.0   // Torque(N-m)

+I_7 = 70.0    // Current(A)

+T_7 = 810.0   // Torque(N-m)

+E = 500.0     // Operating voltage(V)

+R_a = 0.6     // Armature resistance(ohm)

+

+// Calculations

+N_1 = 9.55*(E-I_1*R_a)*I_1/T_1   // Speed(rpm)

+N_2 = 9.55*(E-I_2*R_a)*I_2/T_2   // Speed(rpm)

+N_3 = 9.55*(E-I_3*R_a)*I_3/T_3   // Speed(rpm)

+N_4 = 9.55*(E-I_4*R_a)*I_4/T_4   // Speed(rpm)

+N_5 = 9.55*(E-I_5*R_a)*I_5/T_5   // Speed(rpm)

+N_6 = 9.55*(E-I_6*R_a)*I_6/T_6   // Speed(rpm)

+N_7 = 9.55*(E-I_7*R_a)*I_7/T_7   // Speed(rpm)

+

+// Results

+disp("PART IV - EXAMPLE : 6.1 : SOLUTION :-")

+printf("\nSpeed-current of the motor")

+printf("\n_______________________________________")

+printf("\n Current(A)        :      Speed(rpm)  ")

+printf("\n_______________________________________")

+printf("\n   %.f              :        %.f ", I_1,N_1)

+printf("\n   %.f              :        %.f ", I_2,N_2)

+printf("\n   %.f              :        %.f ", I_3,N_3)

+printf("\n   %.f              :        %.f ", I_4,N_4)

+printf("\n   %.f              :        %.f ", I_5,N_5)

+printf("\n   %.f              :        %.f ", I_6,N_6)

+printf("\n   %.f              :        %.f ", I_7,N_7)

+printf("\n_______________________________________\n")

+printf("\nNOTE: ERROR: Calculation mistakes in the textbook solution")

diff --git a/3472/CH44/EX44.2/Example44_2.sce b/3472/CH44/EX44.2/Example44_2.sce
new file mode 100644
index 000000000..b05cc7f3b
--- /dev/null
+++ b/3472/CH44/EX44.2/Example44_2.sce
@@ -0,0 +1,59 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 6: MOTORS FOR ELECTRIC TRACTION

+

+// EXAMPLE : 6.2 :

+// Page number 788-789

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+N_1 = 500.0    // Speed(rpm)

+I_1 = 50.0     // Current(A)

+E_1 = 220.0    // Armature voltage(V)

+I_2 = 100.0    // Current(A)

+E_2 = 350.0    // Armature voltage(V)

+I_3 = 150.0    // Current(A)

+E_3 = 440.0    // Armature voltage(V)

+I_4 = 200.0    // Current(A)

+E_4 = 500.0    // Armature voltage(V)

+I_5 = 250.0    // Current(A)

+E_5 = 540.0    // Armature voltage(V)

+I_6 = 300.0    // Current(A)

+E_6 = 570.0    // Armature voltage(V)

+R_wb = 0.08    // Armature and brush resistance(ohm)

+R_f = 0.05     // Resistance of series field(ohm)

+V = 600.0      // Operating voltage(V)

+

+// Calculations

+R_a = R_wb+R_f               // Armature resistance(ohm)

+N_11 = N_1/E_1*(V-I_1*R_a)   // Speed(rpm)

+T_1 = 9.55*E_1*I_1/N_1       // Torque(N-m)

+N_2 = N_1/E_2*(V-I_2*R_a)    // Speed(rpm)

+T_2 = 9.55*E_2*I_2/N_1       // Torque(N-m)

+N_3 = N_1/E_3*(V-I_3*R_a)    // Speed(rpm)

+T_3 = 9.55*E_3*I_3/N_1       // Torque(N-m)

+N_4 = N_1/E_4*(V-I_4*R_a)    // Speed(rpm)

+T_4 = 9.55*E_4*I_4/N_1       // Torque(N-m)

+N_5 = N_1/E_5*(V-I_5*R_a)    // Speed(rpm)

+T_5 = 9.55*E_5*I_5/N_1       // Torque(N-m)

+N_6 = N_1/E_6*(V-I_6*R_a)    // Speed(rpm)

+T_6 = 9.55*E_6*I_6/N_1       // Torque(N-m)

+

+// Results

+disp("PART IV - EXAMPLE : 6.2 : SOLUTION :-")

+printf("\nSpeed-torque curve for motor")

+printf("\n_______________________________________")

+printf("\n Speed(rpm)         :      Torque(N-m)  ")

+printf("\n_______________________________________")

+printf("\n   %.f             :        %.f ", N_11,T_1)

+printf("\n   %.f              :        %.f ", N_2,T_2)

+printf("\n   %.f              :        %.f ", N_3,T_3)

+printf("\n   %.f              :        %.f ", N_4,T_4)

+printf("\n   %.f              :        %.f ", N_5,T_5)

+printf("\n   %.f              :        %.f ", N_6,T_6)

+printf("\n_______________________________________\n")

+printf("\nNOTE: ERROR: Calculation mistakes in the textbook solution")

diff --git a/3472/CH44/EX44.3/Example44_3.sce b/3472/CH44/EX44.3/Example44_3.sce
new file mode 100644
index 000000000..b4ec99ef4
--- /dev/null
+++ b/3472/CH44/EX44.3/Example44_3.sce
@@ -0,0 +1,32 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 6: MOTORS FOR ELECTRIC TRACTION

+

+// EXAMPLE : 6.3 :

+// Page number 790

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+V = 650.0      // Voltage supply(V)

+r_A = 45.0     // Radius of driving wheel(cm)

+r_B = 43.0     // Radius of driving wheel(cm)

+N_A = 400.0    // Speed(rpm)

+drop = 10.0    // Voltage drop(%)

+

+// Calculations

+rho = r_B/r_A

+IR = drop*V/100                 // Voltage drop(V)

+V_A = (rho*(V-IR)+IR)/(1+rho)   // Voltage(V)

+V_B = V-V_A                     // Voltage(V)

+N_A_A = N_A*(V_A-IR)/(V-IR)     // N"_A(rpm)

+N_B_B = N_A_A*r_A/r_B           // N"_B(rpm)

+

+// Results

+disp("PART IV - EXAMPLE : 6.3 : SOLUTION :-")

+printf("\nSpeed of first motor when connected in series, N_A = %.f rpm", N_A_A)

+printf("\nSpeed of second motor when connected in series, N_B = %.f rpm\n", N_B_B)

+printf("\nNOTE: Changes in the obtained answer from that of textbook is due to more precision here")

diff --git a/3472/CH44/EX44.4/Example44_4.sce b/3472/CH44/EX44.4/Example44_4.sce
new file mode 100644
index 000000000..a70a81581
--- /dev/null
+++ b/3472/CH44/EX44.4/Example44_4.sce
@@ -0,0 +1,26 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 6: MOTORS FOR ELECTRIC TRACTION

+

+// EXAMPLE : 6.4 :

+// Page number 791

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+F_t = 33800.0   // Tractive effort(N)

+V = 48.3        // Velocity(kmph)

+T = 53400.0     // Tractive effort(N)

+

+// Calculations

+HP = F_t*V*1000/(60*60*746)    // HP on level track(hp)

+HP_i = HP*(T/F_t)**0.5         // hp delivered by locomotive for dc series motor(hp)

+HP_ii = HP*T/F_t               // hp delivered by locomotive for induction motor(hp)

+

+// Results

+disp("PART IV - EXAMPLE : 6.4 : SOLUTION :-")

+printf("\nhp delivered by the locomotive when dc series motor is used = %.f HP", HP_i)

+printf("\nhp delivered by the locomotive when induction motor is used = %.f HP", HP_ii)

diff --git a/3472/CH44/EX44.5/Example44_5.sce b/3472/CH44/EX44.5/Example44_5.sce
new file mode 100644
index 000000000..89faf730a
--- /dev/null
+++ b/3472/CH44/EX44.5/Example44_5.sce
@@ -0,0 +1,60 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 6: MOTORS FOR ELECTRIC TRACTION

+

+// EXAMPLE : 6.5 :

+// Page number 792-793

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+I_1 = 100.0                // Current(A)

+N_1 = 71.0                 // Speed(kmph)

+F_t1 = 2225.0              // Tractive effort(N)

+I_2 = 150.0                // Current(A)

+N_2 = 57.0                 // Speed(kmph)

+F_t2 = 6675.0              // Tractive effort(N)

+I_3 = 200.0                // Current(A)

+N_3 = 50.0                 // Speed(kmph)

+F_t3 = 11600.0             // Tractive effort(N)

+I_4 = 250.0                // Current(A)

+N_4 = 45.0                 // Speed(kmph)

+F_t4 = 17350.0             // Tractive effort(N)

+I_5 = 300.0                // Current(A)

+N_5 = 42.0                 // Speed(kmph)

+F_t5 = 23200.0             // Tractive effort(N)

+D_A = 101.6                // Size of wheels(cm)

+ratio_gear = 72.0/23       // Gear ratio

+D_B = 106.7                // Size of wheels(cm)

+ratio_gear_new = 75.0/20   // Gear ratio

+

+// Calculations

+N_B = ratio_gear*D_B/(ratio_gear_new*D_A)    // Speed in terms of V(kmph)

+F_tB = D_A*ratio_gear_new/(ratio_gear*D_B)   // Tractive effort in terms of F_tA(N)

+N_B1 = N_B*N_1                               // Speed(kmph)

+F_tB1 = F_tB*F_t1                            // Tractive effort(N)

+N_B2 = N_B*N_2                               // Speed(kmph)

+F_tB2 = F_tB*F_t2                            // Tractive effort(N)

+N_B3 = N_B*N_3                               // Speed(kmph)

+F_tB3 = F_tB*F_t3                            // Tractive effort(N)

+N_B4 = N_B*N_4                               // Speed(kmph)

+F_tB4 = F_tB*F_t4                            // Tractive effort(N)

+N_B5 = N_B*N_5                               // Speed(kmph)

+F_tB5 = F_tB*F_t5                            // Tractive effort(N)

+

+// Results

+disp("PART IV - EXAMPLE : 6.5 : SOLUTION :-")

+printf("\nNew characteristics of motor")

+printf("\n_______________________________________")

+printf("\n Current(A)  :  Speed(kmph)  :  F_t(N)")

+printf("\n_______________________________________")

+printf("\n  %.f        :   %.1f        :   %.f ", I_1,N_B1,F_tB1)

+printf("\n  %.f        :   %.1f        :   %.f ", I_2,N_B2,F_tB2)

+printf("\n  %.f        :   %.1f        :   %.f ", I_3,N_B3,F_tB3)

+printf("\n  %.f        :   %.1f        :   %.f ", I_4,N_B4,F_tB4)

+printf("\n  %.f        :   %.1f        :   %.f ", I_5,N_B5,F_tB5)

+printf("\n_______________________________________\n")

+printf("\nNOTE: Changes in the obtained answer from that of textbook is due to more precision here")