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Three Phase Induction Motors

Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

2 to 5 %
10 to 20 %
None of the listed here
20 to 30 %

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction opposite to stator flux
Insufficient data
Always revolves in the direction of stator flux
None of the listed here

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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

2 Hz
50 Hz
20 Hz
200 Hz

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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 _____

None of the listed here
60 Hz
25 Hz
50 Hz

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

S × rotor input
(1+S) × rotor input
None of the listed here
(1-S) × rotor input

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Uniform torque
Less rotor losses
None of the listed here
Greater mechanical strength

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