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+// Example 10.9
+// Computation of (a) Steady state armature current if a rheostat in the 
+// shunt field circuit reduces flux in air gap to 75% of its rated value 
+// (b) Steady state speed for the conditions in (a)
+// Page No. 421
+
+clc;
+clear;
+close;
+
+// Given data
+Rf=160;               // Field resistance
+VT=240;               // Rated voltade of the machine
+IT=37.5;              // Total current
+Ra=0.213;             // Armature resistance
+Rip=0.092;            // Resistance of interpolar winding
+Rcw=0.065;            // Resistance of compensating windings
+n1=2500;              // Rated speed of the machine
+
+
+// (a) At rated conditions
+
+If=VT/Rf;               // Field current
+Ia1=IT-If;              // Armature current
+Ia2=Ia1*0.50*1/0.75;
+
+// (b) steady state speed for the above mentioned conditions
+
+Racir=Ra+Rip+Rcw;
+
+n2=n1*(VT-(Ia2*(1+Racir)))/0.75*(1/(VT-(Ia1*Racir)));
+
+
+// Display result on command window
+
+printf("\n Steady state armature current = %0.1f A ",Ia2);
+printf("\n Steady state speed = %0.0f r/min ",n2);
+
+