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SYNCHRONOUS MOTORS

Synchronous Motors
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

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Synchronous Motors
For the same active power consumed, the stator current of a synchronous motor is ______ that of a 3 phase induction motor.

More than
None of the listed here
The same as
Less than

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

Under-excited
Over-excited
All of these
Normally excited

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Synchronous Motors
While running, a synchronous motor is compelled to run at synchronous speed because of _______

Magnetic locking between stator and rotor poles
Compulsion due to lenz's law
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces

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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,

Current to field winding
Polarity of rotor poles
Supply phase sequence
None of the listed here

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