ALTERNATORS QUIZ

In an alternator one of the advantages of distribution the winding is to

Save on copper

None of the listed here

Reduce noise

Improve voltage wavefrom

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Zero power factor method for alternator is generally used to determine

None of the listed here

Efficiency of alternator

Voltage regulation of the alternator

Synchronous impedance of alternator

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For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles.

2

8

12

4

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If the excitation of an alternator operating in parallel with other alternators is decreased, its ______

Pf becomes more lagging

Pf becomes more leading

Output kW will change

None of the listed here

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The voltage regulation of an alternator depends on

Both load current and pf

Load current only

None of the listed here

Power factor only

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Alternators, now a days, are designed to have poor regulation because

We employ automatic voltage regulators

None of the listed here

It limits the value of short circuit current

It reduces the construction cost

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The power factor of an alternator is determined by its

Primemover

Speed

Excitation

Load

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If the number of poles of an alternator is increased, the generated emf

Decreases

None of the listed here

Remains the same

Increases

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Three phase alternators are invariably star commected because

Higher terminal voltage is obtained

Magnetic losses are the minimum

Small conductors can be used

Less turns of wire are required

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The slip rings emplyod in a 3-phase alternator in hydro station are insulated for

Full armature voltage

Very low voltage

Low voltage

Extra high tension voltage

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