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Synchronous Motors

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

None of the listed here
Unity
0.8 lagging
0.8 leading

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Synchronous Motors
In a 3-phase synchronous motor, the negative phase sequence exists when the motor is

under-loaded
over-loaded
supplied with unbalanced voltage
None of these

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Synchronous Motors
The duration of sudden short circuit test on synchronous motor is usually about

None of the listed here
One hour
One second
One minute

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Synchronous Motors
A synchronous motor develops maximum power when load angle is

60°
120°
45°
90°

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

1800 to 3600 rpm
150 to 1800 rpm
None of the listed here
3600 to 6000 rpm

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Synchronous Motors
A synchronous motor can operate at

Leading power factor
Lagging, leading and unity power factors
Unity power factor only
Lagging power factor only

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