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Synchronous Motors
The armature current of a synchronous motor will be minimum for ______ power factor.
None of the listed here
0.8 lagging
Unity
0.8 leading
None of the listed here
0.8 lagging
Unity
0.8 leading
Answer
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Related Question
Synchronous Motors
Synchronous motors are generally used in application requiring _______
Infrequent starting
Sudden application of heavy loads
Frequent stopping
Variable speed
Infrequent starting
Sudden application of heavy loads
Frequent stopping
Variable speed
Answer
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Synchronous Motors
The back e.m.f. of a synchronous motor depends on
All of these
speed
load angle
load
All of these
speed
load angle
load
Answer
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Synchronous Motors
In a 3-phase synchronous motor, the negative phase sequence exists when the motor is
over-loaded
under-loaded
supplied with unbalanced voltage
None of these
over-loaded
under-loaded
supplied with unbalanced voltage
None of these
Answer
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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is
4 percent
Zero
2 percent
10 percent
4 percent
Zero
2 percent
10 percent
Answer
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Synchronous Motors
The induced e.m.f. in a synchronous motor working on leading power factor will be
less than the supply voltage
more than the supply voltage
equal to the supply voltage
None of these
less than the supply voltage
more than the supply voltage
equal to the supply voltage
None of these
Answer
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