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Synchronous Motors

Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range

99 to 99.5%
60 to 70%
85 to 95%
75 to 80%

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Synchronous Motors
The operating speed of a synchronous motor can be changed to new fixed value by

changing the load
using brakes
changing frequency
changing the supply voltage

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Synchronous Motors
The shaft of synchronous motor is made of

Mild steel
Chrome steel
Stainless steel
Alcino

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Synchronous Motors
Power factor of a synchronous motor is unity when

None of the listed here
The armature current is zero
The armature current is minimum
The armature current is maximum

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Synchronous Motors
The speed regulation of a synchronous motor is always

Positive
Zero
1%
0.5%

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Synchronous Motors
When the synchronous motor is pulled out of synchronism, the stator current _______

Remains unchanged
Is decreased too much
Becomes zero
Is increased too much

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