MCQs on Electrical Machines

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01․ In DC machines, the interpoles are provided
to counteract demagnetizing effect of armature mmf in commutating zone.
to counteract the reactance voltage and the cross-magnetizi
to make commutation spark less.
both (B) and (C).

Under construction.
02․ The fall in speed of the DC generator due to increase in load can be corrected by
reducing the load voltage.
cooling the armature.
increasing the excitation.
increasing the input to the prime mover.

Under construction.
03․ The factors that are responsible for decrease in terminal voltage of a shunt generator are
armature resistance, effect of armature reaction.
armature resistance, inter poles, armature.
armature resistance, effect of armature reaction.
reduction in field current, effect of armature reaction, armature.

Under construction.
04․ Which of following DC generator will be in a position to build up without any residual magnetism in the field?
Compound.
Shunt.
Series.
Separately excited.

Under construction.
05․ Flashing of DC generator means
increasing flux density by providing extra ampere-turns in field.
neutralization of residual magnetism.
creation of residual magnetism by a DC source.
none of the above.

Under construction.
06․ Which of the following DC generators has rising V-I characteristics?
Shunt.
Series.
Compound.
None of them.

Under construction.
07․ For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is
shunt connected.
differentially compounded.
cumulatively compounded.
separately excited.

Under construction.
08․ The voltage regulation of a DC generator at full load being zero implies that the generator is
series connected.
shunt connected.
deferentially compounded.
cumulatively compounded.

Under construction.
09․ The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type
level compound.
series generator.
short - shunt generator.
shunt generator.

Under construction.
10․ The ___________________ generator has the poorest voltage regulation.
under-compounded.
differential compounded.
shunt.
over compounded.

Under construction.
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