A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be
A)zero
B)about 2 V
C)about 50 V
D)220V

Question

Quizplus · Accepted Answer

When a DC generator is run at full speed without any excitation, it will still generate a small voltage due to residual magnetism in the iron core. This voltage is typically around 2V, not zero, and certainly not as high as its rated voltage (220V) or an arbitrary value like 50V.

A 220 V DC