SYNCHRONOUS MOTORS QUIZ

The duration of sudden short circuit test on synchronous motor is usually about

One minute

None of the listed here

One second

One hour

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A synchronous motor runs at speed ranging from ______

3600 to 6000 rpm

1800 to 3600 rpm

150 to 1800 rpm

None of the listed here

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A synchronous machine with low value short circuit ratio has

High stability limit

Good voltage regulation

Good speed regulation

Lower stability limit

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The armature current of the synchronous motor has higher values for

None of the listed here

Both higher and low excitation

Low excitation only

Higher excitation only

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An over excited synchronous motor is used for

Variable speed loads

Low torque loads

Power factor corrections

Fluctuating loads

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The rotor of synchronous motor is excited with direct current when the motor _____

Approches half synchronous speed

Approches synchronous speed

None of the listed here

Is at standstill

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A synchronous motor delivers reactive power when ______

Normally excited

Under excited

Over excited

None of the listed here

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If one phase of a 3 phase synchronous motor is short circuited, motor

Will not come upto speed

Will fail to pull into step

Will overheat in spots

Will refused ro start

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When load on a synchronous motor is increased, its armature current is increased provided, it is ______

Over-excited

Under-excited

Normally excited

All of these

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The maximum speed variation in a 3 phase synchronous motor is

10 percent

Zero

4 percent

2 percent

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YOUR ANSWER : ?

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