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diff --git a/431/CH4/EX4.28/EX4_28.sce b/431/CH4/EX4.28/EX4_28.sce
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+//Calculate starting torque 
+//Chapter 4
+//Example 4.28
+//page 333
+clear;
+clc; 
+disp("Example 4.28")
+ph=3;
+//rotor copper loss=slip*rotor input
+//Tst= starting torque
+//Tfl=torque at full load
+//Ist/Ifl=r
+r=6;
+S=0.04
+printf(" At slip=0.04")
+printf("\nFor direct-on-line starting, (Tst/Tfl)=%f",((r^2*S)));
+//phase current in start is (1/sqrt(3)) times the phase current in delta
+
+printf("\nFor direct-on-line starting, (Tst/Tfl)=%f",((r/sqrt(3))^2*S));
+
+
+
+