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Synchronous Motors
The operating speed of a synchronous motor can be changed to new fixed value by
changing frequency
changing the supply voltage
changing the load
using brakes
changing frequency
changing the supply voltage
changing the load
using brakes
Answer
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Related Question
Synchronous Motors
The construction of a synchronous motor resembles
a rotary converter
a series motor
an induction motor
an alternator
a rotary converter
a series motor
an induction motor
an alternator
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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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about
one hour
None of these
one second
one minute
one hour
None of these
one second
one minute
Answer
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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range
85 to 95%
75 to 80%
60 to 70%
99 to 99.5%
85 to 95%
75 to 80%
60 to 70%
99 to 99.5%
Answer
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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______
Reduce dc field excitation to zero
None of the listed here
Change supply frequency
Interchange any two stator lines
Reduce dc field excitation to zero
None of the listed here
Change supply frequency
Interchange any two stator lines
Answer
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