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Three Phase Induction Motors

Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

1
Very large
As small as possible
Large

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

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

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.5
0
0.1
1

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Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

0.4 mm to 4 mm
2 cm to 4 cm
1 cm to 2 cm
4 cm to 6 cm

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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 rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Star
Delta
None of the listed here
Partly star and partly delta

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