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THREE PHASE INDUCTION MOTORS

Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

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

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

None of the listed here
Two times
Four times
Equal to

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

None of the listed here
Inveresly proportional to supply voltage
inversely proportional to rotor reactance at standstill
Directly proportional to rotor resistance

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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 _______

20 W
980 W
500 W
200 W

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