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Synchronous Motors
The speed regulation of a synchronous motor is always
1%
Positive
Zero
0.5%
1%
Positive
Zero
0.5%
Answer
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Related Question
Synchronous Motors
Most of the synchronous motors are _______ power factor metors.
0.8 lagging
0.8 leading
0.5 leading
Unity
0.8 lagging
0.8 leading
0.5 leading
Unity
Answer
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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,
Supply phase sequence
Polarity of rotor poles
None of the listed here
Current to field winding
Supply phase sequence
Polarity of rotor poles
None of the listed here
Current to field winding
Answer
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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
less
more
twice
equal
less
more
twice
equal
Answer
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Synchronous Motors
A synchronous machine with low value of short-circuit ratio has
high stability limit
lower stability limit
good voltage regulation
good speed regulation
high stability limit
lower stability limit
good voltage regulation
good speed regulation
Answer
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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______
Motor input
Armature input
Dc source
Supply lines
Motor input
Armature input
Dc source
Supply lines
Answer
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