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Three Phase Induction Motors

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
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Smaller than
None of the listed here
Greater than
Equal to

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

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

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Rotor current remains same
Decreases the rotor current
Rotor current becomes zero
Increases the rotor current

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Three Phase Induction Motors
The condition of induction motor at no load resemble those of a transformer whose secondady is _______

Short-circuited
Supplying a variable resistive load
Open circuited
None of the listed here

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

2 poles
8 poles
6 poles
4 poles

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