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Three Phase Induction Motors

Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

None of the listed here
Large
Practically zero
Small

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

5 Hz
1.5 Hz
2.5 Hz
0.05 Hz

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
Always revolves in the direction opposite to stator flux
Insufficient data
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

20 Hz
200 Hz
50 Hz
2 Hz

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

Shaft diameter
Rotor emf
Rotor power factor
Rotor current

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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

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

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