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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

20 Hz
200 Hz
50 Hz
2 Hz

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Three Phase Induction Motors
The shaft of induction motor is made of

Stiff
Hollow
Flexible
Any of the listed here

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Steady
Rotating
None of the listed here
Alternating

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Both (A) and (B)
Squirrel cage induction motor
None of these
Slip ring induction motor

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Three Phase Induction Motors
The low power factor of induction motor is due to

All of these
The reactive lagging magnetizing current necessary to generate the magnetic flux
Rotor leakage reactance
Stator reactance

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

None of the listed here
Leakage reactances are decreased
Leakage reactances are increased
No load current is decreased

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