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Three Phase Induction Motors

Three Phase Induction Motors
In an induction motor, no load the slip is generally

2%
1.5 %
4%
Less than 1%

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

Practically zero
Large
None of the listed here
Small

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Equal to
Smaller than
Greater than

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Three Phase Induction Motors
The low power factor of induction motor is due to

Stator reactance
Rotor leakage reactance
All of these
The reactive lagging magnetizing current necessary to generate the magnetic flux

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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 increased
None of the listed here
Leakage reactances are decreased

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

No load
Starting
Half full load
Full load

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