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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

50 Hz
200 Hz
20 Hz
2 Hz

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing supply frequency
Reducing supply voltage
Changing number of poles
Changing winding resistance

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

50 Hz
25 Hz
60 Hz
None of the listed here

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

None of the listed here
Decreased at starting
Increased under running conditions
Increased at starting

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always eqaul to the number of
Always less than the number of
Either more or less than the number of
Always greater than the number of

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

Synchronous
Slip ring
Series
Commutator

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MORE MCQ ON Three Phase Induction Motors

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