SYNCHRONOUS MOTORS QUIZ

The capacity of a synchronous capacitor is generally in the range of

kVAR

MVAR

VAR

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______

16

36

30

None of the listed here

TRUE ANSWER : ?
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The induced e.m.f. in a synchronous motor working on leading power factor will be

less than the supply voltage

None of these

equal to the supply voltage

more than the supply voltage

TRUE ANSWER : ?
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Which of the following motors is non self starting?

Dc series motor

Synchronous motor

Squirrel cage induction motor

Wound rotor induction motor

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The construction of a synchronous motor resembles

a rotary converter

an induction motor

an alternator

a series motor

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For reciprocating compressor, the synchronous motor is designed to have pull in torque of about ______ times the full load torque.

2

0.5

6

5

TRUE ANSWER : ?
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In order to to reverse the direction of a synchronous motor, _______

Change supply frequency

Interchange any two stator lines

Reduce dc field excitation to zero

None of the listed here

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A synchronous capacitor is an over excited motor running at ________

Full load

No load

Half full load

None of the listed here

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The size of a synchronous motor decreases with the increase in

All of the listed here

Speed

Flux density

Horse power rating

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The back emf in the stator of a synchronous motor depends on

Flux density

Rotor speed

Rotor excitation

None of the listed here

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YOUR ANSWER : ?

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