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If the residual magnetism of a DC shunt generator is destroyed accidentally, it may be restored by connecting its shunt ﬁeld:

Question

If the residual magnetism of a DC shunt generator is destroyed accidentally, it may be restored by connecting its shunt ﬁeld:

In reverse

to a DC source

to a AC source

to the earth

Solution

Correct option is B

If the residual magnetism of a DC shunt generator is destroyed accidentally, it may be restored by connecting its shunt ﬁeld to a DC source.
Residual magnetism is the small magnetic ﬁeld left in the iron cores of the shunt ﬁeld when the generator is at rest.