SYNCHRONOUS MOTORS QUIZ

A synchronous motor is cheaper than 3-phase induction motor for _____

None of the listed here

High speed, low output

High speed, high output

Low speed, high output

TRUE ANSWER : ?
YOUR ANSWER : ?

The size of a synchronous motor is determined by its _____

kW rating

kVAR rating

kVA rating

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

it runs at a slower speed

it runs at a very high speed

the motor stops

it continues to run at the same speed

TRUE ANSWER : ?
YOUR ANSWER : ?

For power factor correction, synchronous motors operate at

normal load with minimum excitation

no-load and greatly over-excited fields

no-load and under-excited fields

normal load with zero excitation

TRUE ANSWER : ?
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The rotor of synchronous motor is excited with direct current when the motor _____

None of the listed here

Approches half synchronous speed

Approches synchronous speed

Is at standstill

TRUE ANSWER : ?
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A synchronous motor working at leading power factor can be used as

Noise generator

Phase advancer

Mechanical synchronizer

Voltage booster

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The construction of a synchronous motor resembles

an alternator

a rotary converter

an induction motor

a series motor

TRUE ANSWER : ?
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An under excited synchronous motor behaves as_______

A resistor

A capacitor

An inductor

None of the listed here

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YOUR ANSWER : ?

A synchronous motor with large air gap has

A small value of inherent regulation

A higher synchronizing power which makes the machine less sensitive to load variations

A higher value of stability limit

All of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Slip rings in a synchronous motor carry

Direct current

No current

All of the listed here

Alternating current

TRUE ANSWER : ?
YOUR ANSWER : ?

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