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Synchronous Motors
The construction of a synchronous motor ressembles
A series motor
An alternator
A rotary converter
An induction motor
A series motor
An alternator
A rotary converter
An induction motor
Answer
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Related Question
Synchronous Motors
A three phase synchronous motor will have
No slip rings
One slip rings
Two slip rings
Three slip rings
No slip rings
One slip rings
Two slip rings
Three slip rings
Answer
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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range
99 to 99.5%
75 to 80%
85 to 95%
60 to 70%
99 to 99.5%
75 to 80%
85 to 95%
60 to 70%
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
more
equal
less
twice
more
equal
less
twice
Answer
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Synchronous Motors
The net armature voltage of a synchronous motor is equal to the
vector sum of Eb and V
arithmetic difference of Eb and V
vector difference of Eh and V
arithmetic sum of Eb and V
vector sum of Eb and V
arithmetic difference of Eb and V
vector difference of Eh and V
arithmetic sum of Eb and V
Answer
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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be
lagging
zero
unity
leading
lagging
zero
unity
leading
Answer
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