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Three Phase Induction Motors

Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Smaller than
Greater than
Equal to

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

4 poles
2 poles
6 poles
8 poles

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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
50 Hz
2 Hz
200 Hz

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

None of the listed here
Both squirrel cage and slip ring
Squirrel cage induction motor
Slip ring induction motor

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1/S
S
S/1-S
1-S

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Shaft diameter
Rotor power factor
Rotor emf
Rotor current

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