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Three Phase Induction Motors

Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Negligible
Same as full load torque
Low
Slightly more than full load torque

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Decreased two times
Increased four times
Increased two times
Decreased four times

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

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

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Remains the same at all loads
Maximum at no load
Minimum at no load
None of the listed here

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1+S) × rotor input
S × rotor input
(1-S) × rotor input
(S-1) × rotor input

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

Equal to
None of the listed here
Smaller than
Greater than

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