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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

200 Hz
50 Hz
2 Hz
20 Hz

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Three Phase Induction Motors
The induction motor has lagging power factor during

Starting only
Operation only
None of the listed here
Both starting and operation

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1-S) × rotor input
(S-1) × rotor input
S × rotor input
(1+S) × rotor input

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

4 poles
2 poles
8 poles
6 poles

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Synchronous
Commutator
Series

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Three Phase Induction Motors
Reduced voltage starter can be used with

None of these
Slip ring motor only but not with squirrel cage induction motor
Squirrel cage as well as slip ring induction motor
Squirrel cage induction motor only but not with slip ring motor

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