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Three Phase Induction Motors

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 _______

980 W
20 W
200 W
500 W

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Three Phase Induction Motors
The torque developed in the cage induction motor with auto-starter is

K × torque with direct switching
K2 × torque with direct switching
k/torque with direct switching
k2/torque with direct switching

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

One
Two
Three
Four

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Cast iron
Aluminium
Silicon steel
Bronze

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Three Phase Induction Motors
Slip rings are usually made of

Carbon
Phospor bronze
Aluminium
Copper

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Three Phase Induction Motors
In an induction motor if air gap increased

Bearing friction will reduce
Windage losses will be more
Copper loss will reduce
The power factor will be low

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