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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is
(1 / 15) times the synchronous speed.
(1 / 5) times the synchronous speed.
0.5 times the synchronous speed.
5 times the synchronous speed.
(1 / 15) times the synchronous speed.
(1 / 5) times the synchronous speed.
0.5 times the synchronous speed.
5 times the synchronous speed.
Answer
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Related Question
Electrical Machines
Which of the following motors has negative speed regulation?
Differential compound motors.
Both B and C.
Series motors.
Shunt motors.
Differential compound motors.
Both B and C.
Series motors.
Shunt motors.
Answer
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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them
just ahead of magnetic neutral axis.
in magnetic neutral axis.
None of these
just behind the magnetic neutral axis.
just ahead of magnetic neutral axis.
in magnetic neutral axis.
None of these
just behind the magnetic neutral axis.
Answer
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Electrical Machines
In case of 3 - Φ IM, plugging means
interchanging two supply phases for quick stopping.
starting the motor on load which is more than the rated load.
pulling the motor directly on line without a rotor.
locking of rotor due to harmonics.
interchanging two supply phases for quick stopping.
starting the motor on load which is more than the rated load.
pulling the motor directly on line without a rotor.
locking of rotor due to harmonics.
Answer
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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting
the damper bars develop induction generator torque.
the damper bars develop induction motor torque.
the damper bars develop synchronous motor torque.
negative sequence currents are generated.
the damper bars develop induction generator torque.
the damper bars develop induction motor torque.
the damper bars develop synchronous motor torque.
negative sequence currents are generated.
Answer
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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to
V2
f2
f
V
V2
f2
f
V
Answer
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