DC GENERATORS QUIZ

The current in armature conductors of a dc machine is ______

Ac

Pure dc plus pulsating dc

Pure dc

Pulsating dc

TRUE ANSWER : ?
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The main drawback of a dc shunt generator is that

Shunt field circuit has high resistance

Generated voltage is small

Terminal voltage drops considerably

It is expensive

TRUE ANSWER : ?
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In dc generator, the constant losses is equal to

Stray losses plus shunt cu loss

None of the listed here

Mechanical losses

Stray losses

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In a commutator

Mica and copper are equally hard

Mica is harder than copper

None of the listed here

Copper is harder than mica

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In dc generator, the generated voltage depend upon

Both speed and flux

None of the listed here

Flux only

Speed only

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The overall efficiency of a dc generator is maximum when its variable loss is equal to

Iron loss

Constant loss

Mechanical loss

Stray loss

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For the same rating, a dc machine has_______ an ac machines.

More weight than

The same weight as

Less weight than

None of the listed here

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In D.C. generators on no-load, the air gap flux distribution in space is

Flat topped

Sinusoidal

Triangular

Pulsating

TRUE ANSWER : ?
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A triplex wave winding will have parallel paths.

2

4

None of the listed here

6

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The efficiency of a dc generator means its

Mechanical efficiency

Overall efficiency

None of the listed here

Electrical efficiency

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