ALTERNATORS QUIZ

When the speed of an alternator is reduced by half, the generated emf will become

Twice

Half

Four times

One-fourth

TRUE ANSWER : ?
YOUR ANSWER : ?

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

4

8

12

2

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Extra high tension voltage

Very low voltage

Low voltage

Full armature voltage

TRUE ANSWER : ?
YOUR ANSWER : ?

In air-crafts, alternators have operating frequency of

500 Hz

400 Hz

50 Hz

60 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

In an alternator, the frequency of voltage generated depend on

None of the listed here

Rotative speed only

Number of poles only

Both rotative speed and number of poles

TRUE ANSWER : ?
YOUR ANSWER : ?

High speed alternators are driven by _____.

Hydraulic turbines

None of the listed here

Steam turbines

Diesel engines

TRUE ANSWER : ?
YOUR ANSWER : ?

The synchronous reactance of an alternator is generally _______ armature resistance.

10 to 100 times greater than

10 times smaller than

5 times greater than

5 times smaller than

TRUE ANSWER : ?
YOUR ANSWER : ?

Armature winding of an alternator are generally

Open winding

Partly open and partly closed windings

None of the listed here

Closed winding

TRUE ANSWER : ?
YOUR ANSWER : ?

The speed of a salient pole machine is nearly

1000 rpm

500 rpm

1500 rpm

3000 rpm

TRUE ANSWER : ?
YOUR ANSWER : ?

The rotor of a turbo alternator is made cylindrical in order to reduce_______

Hysteresis loss

Eddy current loss

Windage loss

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

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