initial commit / add all books

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diff --git a/1370/CH2/EX2.13/example2_13.sce b/1370/CH2/EX2.13/example2_13.sce
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+//example2.13

+clc

+disp("Let no load,speed be N_0=1000 rpm")

+disp("I_L0=Line current on no load=6 A")

+disp("I_L0=(I_a0)+(I_sh)")

+s=220/110

+disp(s,"(I_sh)[in A]=V/(R_sh)=")

+a=6-2

+disp(a,"Therefore,  (I_a0)[in A]=(I_L0)-(I_sh)=")

+disp("Therefore, Back emf on no load E_b0 can be determined from the voltage equation.")

+disp("V=(E_b0)+[(I_a0)+(R_a)]")

+disp("Therefore,    220=(E_b0)+(4*0.3)")

+b=220-1.2

+disp(b,"E_b0(in V)=")

+disp("On full load condition,supply voltage is constant and hence,")

+s=220/110

+disp(s,"(I_sh)[in A]=V/(R_sh)=")

+disp("Now,(I_L)=(I_aFL)+(I_sh)")

+disp("Therefore,    50=(I_aFL)+2")

+f=50-2

+disp(f,"Therefore,  (I_aFL)[in A]=")

+disp("And,  V=(E_bFL)+[(I_aFL)*(R_a)]")

+disp("Therefore,    220=(E_bFL+(48*0.3))")

+b=220-(48*0.3)

+disp(b,"Therefore,    (E_bFL)[in V]=")

+disp("From the speed equation,")

+disp("N directly proportional to (E_b)/psi")

+disp("But psi is constant as I_sh is constant for both the load conditions")

+disp("Therefore,    (N_0)/(N_FL)=(E_b0)/(E_bFL)")

+n=(1000*205.6)/218.8

+format(7)

+disp(n,"Therefore,    (N_FL)[in rpm]=[(N_0)*(E_bFL)]/(E_b0)=")