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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?
95%
94%
92%
96%
95%
94%
92%
96%
Answer
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Related Question
Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be
plugging.
crawling.
cogging.
locking.
plugging.
crawling.
cogging.
locking.
Answer
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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is
0.5 times the synchronous speed.
(1 / 5) times the synchronous speed.
5 times the synchronous speed.
(1 / 15) times the synchronous speed.
0.5 times the synchronous speed.
(1 / 5) times the synchronous speed.
5 times the synchronous speed.
(1 / 15) times the synchronous speed.
Answer
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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?
Compound (cummolative).
none of these.
Shunt.
Series.
Compound (cummolative).
none of these.
Shunt.
Series.
Answer
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Electrical Machines
Armature reaction effect is more in which of the following methods?
armature resistance control
field weakening method
None of these
same in both methods
armature resistance control
field weakening method
None of these
same in both methods
Answer
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Electrical Machines
In a DC machine, for the same value of Æ, Z and N; which one of the following statements is correct?
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is less with wave winding than with lap winding.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is less with wave winding than with lap winding.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Answer
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