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THREE PHASE INDUCTION MOTORS

Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1-S
S/1-S
S
1/S

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Three Phase Induction Motors
The no load speed of an induction motor depends on

Both supply frequency and number of poles
The supply frequency
The maximum flux/poles
The number of its poles

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Three Phase Induction Motors
The rotor of induction motor

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

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

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

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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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