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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
The condition for maximum running torque is

 R = S.X
 0.707 lagging
 zero
 0.5 lagging
 unity

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Electrical Machines
Maximum power will be developed when back emf is

All of these
 half of the supply voltage.
 double the supply voltage.
 equal to supply voltage.

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Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
 both A and B
None of these
 armature current(Ia)

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Remains same.
 Doubled.
 Eight times.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 less than the width of commutator segment.

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