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Three Phase Induction Motors

Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

0.5 leading
0.2 lagging
0.2 leading
Unity

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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

200 Hz
50 Hz
2 Hz
20 Hz

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

No-load test
All of these
Stator resistance test
Blocked rotor test

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Slip
Line voltage
Rotor current
Running torque

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

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

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

None of the listed here
Less rotor losses
Greater mechanical strength
Uniform torque

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