SYNCHRONOUS MOTORS QUIZ

The ratio of starting torque to running torque in a synchronous motor is

One

Zero

Two

Infinity

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In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

the torque generated is maximum

the excitation is said to be hundred per cent

the motor is said to be fully loaded

the excitation is said to be zero per cent

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A three phase synchronous motor will have

No slip rings

One slip rings

Two slip rings

Three slip rings

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While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

eddy current and hysteresis torque in pole faces

All of the listed here

induction motor torque in field winding

induction motor torque in damper winding

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In a synchronous motor, the rotor copper loss are met by ______

Motor input

Supply lines

Armature input

Dc source

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The rotor copper losses, in a synchronous motor, are met by

supply lines

armature input

c. source

motor input

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A synchronous machine with low value of short-circuit ratio has

good speed regulation

good voltage regulation

lower stability limit

high stability limit

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The percentage slip in case of a synchronous motor is

1

0.005

0.01

zero

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

High speed, low output

Low speed, high output

High speed, high output

None of the listed here

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Leading power factor synchronous motors cost ______ the unity pf motors.

Less than

About the same as

None of the listed here

More than

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