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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always greater than the number of
Either more or less than the number of
Always eqaul to the number of
Always less than the number of

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Rotor current remains same
Decreases the rotor current
Rotor current becomes zero
Increases the rotor current

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

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

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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
Greater than
Equal to
Smaller than

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Three Phase Induction Motors
The rotor of an induction motor runs at

Above synchronous speed
Synchronous speed
Any of the above
Below synchronous speed

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