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Three Phase Induction Motors

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

Rotor current
Shaft diameter
Rotor emf
Rotor power factor

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

No load current is decreased
Leakage reactances are decreased
None of the listed here
Leakage reactances are increased

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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 _____

60 Hz
25 Hz
None of the listed here
50 Hz

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Bigger
Same
Any of the listed here
Smaller

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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
200 Hz
2 Hz

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High resistance
None of the listed here
Low resistance
High inductance

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