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Three Phase Induction Motors

Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Greater than
Equal to
Smaller than
None of the listed here

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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 ______

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

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Synchronous
Series
Commutator
Slip ring

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run in reverse direction
The motor will burn
The motor will not run
The motor will run at reduced speed

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

Slip ring induction motor
None of the listed here
Squirrel cage induction motor
Both squirrel cage and slip ring

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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
20 W
980 W
200 W

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