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+// Example 5.11
+// Determine (a) Rotor frequency (b) Slip at which TDmax occurs (c) Rotor speed
+// at 1/2 rated torque load (d) Required rheostat resistance (e) Rated torque
+// Page No. 201
+
+clc;
+clear;
+close;
+
+// Given data
+S=0.0159;                // Slip
+Fbr=50;                  // Rated frequency
+R1=0.00536;              // Motor resistance
+R2=0.00613;
+X1=0.0383;               // Motor reactance
+X2=0.0383;
+Rrhe=0;                  // Initial rheostat resistance
+P=4;                     // Number of poles
+NR=1000;                 // Rated speed
+s1=0.0159;               // Slip of rheostat
+a=2;                     // Stator to rotor turns ratio
+hp=400;                  // Motor horsepower
+
+// (a) Rotor frequency
+fr=S*Fbr;
+
+// (b) Slip at which TDmax occurs
+Stdmax=(R2+Rrhe)/(sqrt(R1^2+(X1+X2)^2));
+
+// (c) Rotor speed at 1/2 rated torque load 
+s=S*(0.5)*(R2/R2);  // Rotor speed at 1/2 rated torque
+ns=120*Fbr/P;        
+nr=ns*(1-s);         // Rotor speed
+
+// (d) Required rheostat resistance
+s2=(ns-NR)/ns;
+Rrhe2=((s2/s1)*(1/0.5)*(R2+Rrhe))-R2;  // rheostat resistance
+Rrheostat=Rrhe2/a^2;
+
+// (e) Rated torque
+nr1=ns*(1-s1);       // Rated speed
+T=hp*5252/nr1;
+
+
+
+// Display result on command window
+printf("\n Rotor frequency = %0.3f Hz",fr);
+printf("\n Slip at which TDmax occurs = %0.4f ",Stdmax);
+printf("\n Rotor speed at 1/2 rated torque = %0.0f r/min",nr);
+printf("\n Required rheostat resistance = %0.4f Ohm/phase",Rrheostat);
+printf("\n Rated torque = %0.0f lb-ft",T);