SYNCHRONOUS MOTORS QUIZ

Under excited

Under loaded

Over loaded

Over excited

An inductor

None of the listed here

A capacitor

A resistor

One hour

One minute

None of the listed here

One second

Is decreased too much

Remains unchanged

Is increased too much

Becomes zero

None of the listed here

Nonsalient pole type

Identical to that of a dc motor

Salient pole type

A higher value of stability limit

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

A small value of inherent regulation

All of the listed here

Directly proportional to square of

Directly proportional to

Invesely proportional to

Independent of

synchronous motor has large air gap

stator supply is relieved of responsibility of producing magnetic field

mechanical load on the motor can be adjusted

synchronous motor runs at synchronous speed

Variable supply frequency

Variable load

Windage friction

Variable frequency

run with excessive vibrations

take less than the rated load

run at 2/3 of synchronous speed

not start