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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
Smaller than
Equal to
None of the listed here

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Three Phase Induction Motors
The induction motor has lagging power factor during

Operation only
Both starting and operation
None of the listed here
Starting only

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

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

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

No-load test
Stator resistance test
All of these
Blocked rotor test

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

4 poles
2 poles
8 poles
6 poles

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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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