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Synchronous Motors
A three phase synchronous motor will have
Three slip rings
One slip rings
Two slip rings
No slip rings
Three slip rings
One slip rings
Two slip rings
No slip rings
Answer
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Related Question
Synchronous Motors
Hunting in a synchronous motor can not be due to
Windage friction
Variable supply frequency
Variable frequency
Variable load
Windage friction
Variable supply frequency
Variable frequency
Variable load
Answer
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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,
None of the listed here
Supply phase sequence
Polarity of rotor poles
Current to field winding
None of the listed here
Supply phase sequence
Polarity of rotor poles
Current to field winding
Answer
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Synchronous Motors
A synchronous motor develops maximum power when load angle is
45°
90°
60°
120°
45°
90°
60°
120°
Answer
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Synchronous Motors
A synchronous motor can operate at
Lagging power factor only
Leading power factor
Lagging, leading and unity power factors
Unity power factor only
Lagging power factor only
Leading power factor
Lagging, leading and unity power factors
Unity power factor only
Answer
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Synchronous Motors
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have
leading power factor with over-excitation
lagging power factor with over-excitation
leading power factor with under-excitation
no change of power factor
leading power factor with over-excitation
lagging power factor with over-excitation
leading power factor with under-excitation
no change of power factor
Answer
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