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Three Phase Induction Motors

Three Phase Induction Motors
Slip rings are usually made of

Copper
Phospor bronze
Carbon
Aluminium

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor reactance
Decreasing rotor resistance
None of the listed here
Increasing rotor resistance

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

None of these
Both (A) and (B)
Squirrel cage induction motor
Slip ring induction motor

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

None of the listed here
Stator slots are not exact multiple of rotor slots
Stator slots are exact multiple of rotor slots
Stator slots are equal to rotor slots

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

500 W
200 W
980 W
20 W

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

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

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