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+clc
+//variable Initialization
+Vm=230//Input Voltage In Volts
+Ra=0.5 //Armature Resistance In Ohm
+Rf=190 //Field resistace in Ohm
+N=1400 //Speed Of Motor In RPM
+Ka=0.8 //Motor voltage constant in V/A-rad/sec
+T=50 //Load Torque In N-m
+
+//Solution
+W=(2*%pi*N)/60 //Angular Speed In rad/Sec.
+//Since the maximum field voltage and current is obtained at a Firing Angle of '0'degree
+af=0 //Firing Angle Of SCR In Degree
+Vf=(Vm*1.414)*(1+cosd(af))*(1/%pi) //field Voltage In volts
+If=Vf/Rf //Field Current In Amp.
+Ia=T/(Ka*If) //Armature current in Amp.
+Eb=(Ka*If*W)//this value is wrongly calculated in book
+Vdc=Eb+Ia*Ra //Voltage across armature in volts
+//for the semi converter fed dc motor the armature voltage is given by...
+A=%pi*Vdc*(1/Vm)*(1/1.414)
+aa=acosd(A-1) //slight change occurs in ans as Eb is wrongly calculated in book
+
+//Results
+printf('\n\n The field Current =%0.1f Amp\n\n',If)
+printf('\n\n The firing Angle Of Armature=%0.1f Degree\n\n',aa)
+//The answer provided in the textbook is wrong(2nd answer)
+
+