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Synchronous Motors

Synchronous Motors
A synchronous motor delivers reactive power when ______

Under excited
Normally excited
Over excited
None of the listed here

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Synchronous Motors
For power factor correction, synchronous motors operate at

no-load and under-excited fields
normal load with minimum excitation
normal load with zero excitation
no-load and greatly over-excited fields

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Synchronous Motors
The armature current of a synchronous motor will be minimum for ______ power factor.

0.8 leading
None of the listed here
Unity
0.8 lagging

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Synchronous Motors
The speed regulation of a synchronous motor is always

0.5%
Zero
Positive
1%

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

0.5
6
5
2

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Synchronous Motors
Which of the following motors is non self starting?

Dc series motor
Squirrel cage induction motor
Wound rotor induction motor
Synchronous motor

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