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+//Problem 21.09: A separately-excited generator develops a no-load e.m.f. of 150 V at an armature speed of 20 rev/s and a flux per pole of 0.10 Wb. Determine the generated e.m.f. when (a) the speed increases to 25 rev/s and the pole flux remains unchanged, (b) the speed remains at 20 rev/s and the pole flux is decreased to 0.08 Wb, and (c) the speed increases to 24 rev/s and the pole flux is decreased to 0.07 Wb.

+

+//initializing the variables:

+E1 = 150; // in Volts

+n1 = 20; // in rev/sec

+Phi1 = 0.10; // in Wb

+n2 = 25; // in rev/sec

+Phi2 = 0.10; // in Wb

+n3 = 20; // in rev/sec

+Phi3 = 0.08; // in Wb

+n4 = 24; // in rev/sec

+Phi4 = 0.07; // in Wb

+

+//calculation:

+//generated e.m.f., E proportional to phi*w and since w = 2*pi*n, then

+// E proportional to phi*n

+// E1/E2 = Phi1*n1/(Phi2*n2)

+E2 = E1*Phi2*n2/(Phi1*n1)

+E3 = E1*Phi3*n3/(Phi1*n1)

+E4 = E1*Phi4*n4/(Phi1*n1)

+

+printf("\n\n Result \n\n")

+printf("\n (a)the generated e.m.f is %.1f V ",E2)

+printf("\n (b)generated e.m.f. is %.0f V ",E3)

+printf("\n (c)generated e.m.f. is %.0f V ",E4)
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