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Electrical Machines
If we increase the rotor reactance value, the maximum torque will
None of these
not changed
decrease
increase
None of these
not changed
decrease
increase
Answer
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Related Question
Electrical Machines
The synchronous speed of an induction motor will be increased by
increasing of frequency.
increasing number of poles.
decreasing of frequency.
speed can not be increased.
increasing of frequency.
increasing number of poles.
decreasing of frequency.
speed can not be increased.
Answer
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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will
start automatically without trouble.
develop very low starting torque.
not start automatically.
get damaged.
start automatically without trouble.
develop very low starting torque.
not start automatically.
get damaged.
Answer
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Electrical Machines
In which of the following motors DC excitation is not required?
hysteresis motor
reluctance motor
3-phase synchronous generator
3-phase synchronous motor
hysteresis motor
reluctance motor
3-phase synchronous generator
3-phase synchronous motor
Answer
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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing
short circuit and slip tests.
open circuit and zero power factor tests.
open circuit and short circuit tests.
zero power factor and slip tests.
short circuit and slip tests.
open circuit and zero power factor tests.
open circuit and short circuit tests.
zero power factor and slip tests.
Answer
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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.
kept constant to certain value.
remains unchanged.
increased.
decreased.
kept constant to certain value.
remains unchanged.
increased.
decreased.
Answer
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