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Synchronous Motors
If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______
None of the listed here
100 cycles/second
25 cycles/ second
50 cycles/second
None of the listed here
100 cycles/second
25 cycles/ second
50 cycles/second
Answer
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Related Question
Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____
Approches half synchronous speed
None of the listed here
Approches synchronous speed
Is at standstill
Approches half synchronous speed
None of the listed here
Approches synchronous speed
Is at standstill
Answer
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Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____
30°
0°
75°
45°
30°
0°
75°
45°
Answer
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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,
Supply phase sequence
None of the listed here
Current to field winding
Polarity of rotor poles
Supply phase sequence
None of the listed here
Current to field winding
Polarity of rotor poles
Answer
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Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor
Varies with power factor
Varies with the load
Varies with speed
Remains constant at all loads
Varies with power factor
Varies with the load
Varies with speed
Remains constant at all loads
Answer
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Synchronous Motors
The speed regulation of a synchronous motor is always
Zero
0.5%
Positive
1%
Zero
0.5%
Positive
1%
Answer
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