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diff --git a/3784/CH4/EX4.2/Ex4_2.sce b/3784/CH4/EX4.2/Ex4_2.sce
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+clc
+//Variable Initialisation
+V=230//Input Voltage of motor in volts
+N=1750//Rated Speed of Motor in rpm
+Ia=74//Armature Current in Ampere
+Ra=0.180//Armature resistance in ohm
+Vdc=240//Dc equivalent input to motor in Volts
+f=500//Chopper Frequency
+W0=2*f*%pi
+la=2.93*10^(-3)//Armature inductance in Henry
+//Solution
+T=1/f//Period of Chopper
+I0=Ia
+W=2*%pi*N/60
+Eb=V-(Ia*Ra)//Back EMF in Volts
+k=Eb/W
+Ea=Vdc/2//Average Voltage
+Eb1=Ea-(Ia*Ra)
+W1=Eb1/k
+N1=W1*(60/(2*%pi))
+ton=T/2
+Irms=((sqrt(2)*Vdc)/(%pi*W0*la))*sin(W0*ton/2)
+Irms1=sqrt((I0^2)+(Irms^2))
+k1=Irms/I0
+I01=Ia/2//Average Value of Source Current
+Irms2=sqrt(2)*Ia/%pi
+k2=Irms2/I01//Source Current Ripple Factor
+printf('\n\n The Motor Speed=%0.1f rpm\n\n',N1)
+printf('\n\n The RMS Armature Current=%0.1f Amp\n\n',Irms1)
+printf('\n\n The RMS and line current ripple factor=%0.1f\n\n',k2)