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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
equal
more
less
twice
equal
more
less
twice
Answer
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Related Question
Synchronous Motors
Hunting in a synchronous motor cannot be due to
windage friction
variable load
variable supply voltage
variable frequency
windage friction
variable load
variable supply voltage
variable frequency
Answer
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Synchronous Motors
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then
the stator current will be zero
the stator current will be very high
the back e.m.f. will be more than the supply voltage
the stator current will be very small
the stator current will be zero
the stator current will be very high
the back e.m.f. will be more than the supply voltage
the stator current will be very small
Answer
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Synchronous Motors
For power factor correction, synchronous motors operate at
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with zero excitation
normal load with minimum excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with zero excitation
normal load with minimum excitation
Answer
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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor
Will fail to pull into step
Will not come upto speed
Will refused ro start
Will overheat in spots
Will fail to pull into step
Will not come upto speed
Will refused ro start
Will overheat in spots
Answer
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Synchronous Motors
If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______
50 cycles/second
100 cycles/second
None of the listed here
25 cycles/ second
50 cycles/second
100 cycles/second
None of the listed here
25 cycles/ second
Answer
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