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+// Example 5.10
+// Determine (a) Range of rotor speed (b) Required rheostat resistance
+// Page No. 198
+
+clc;
+clear;
+close;
+
+// Given data
+F=60;                  // Frequency of motor
+P=14;                  // Number of poles
+SL=0.395;              // Low speed point
+SH=0.02;               // High speed point
+Stdmax=0.74;           // Value at which TD is maximum (from curve B)
+R1=0.403;              // Motor resistance
+R2=0.317;
+X1=1.32;               // Motor reactance
+X2=1.32;
+a=3.8;                 // Ratio of stator turns/phase to rotor turns/phase
+
+// (a) Range of rotor speed
+ns=120*F/P;           // Speed
+nrl=ns*(1-SL);        // Rotor low speed
+nrh=ns*(1-SH);        // Rotor high speed
+
+// (b) Required rheostat resistance
+Rrhe=Stdmax*(sqrt(R1^2+(X1+X2)^2))-R2;
+Rehereq=Rrhe/a^2;
+
+// Display result on command window
+printf("\n Low range of rotor speed = %0.0f r/min",nrl);
+printf("\n High range of rotor speed = %0.0f r/min",nrh);
+printf("\n Required rheostat resistance = %0.3f Ohm/phase",Rehereq);
+