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Three Phase Induction Motors

Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Rotor current
Slip
Running torque
Line voltage

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

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

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

2.5 Hz
5 Hz
1.5 Hz
0.05 Hz

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are decreased
None of the listed here
Leakage reactances are increased
No load current is decreased

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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
S × rotor input
(1-S) × rotor input

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Three Phase Induction Motors
The low power factor of induction motor is due to

Rotor leakage reactance
Stator reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux
All of these

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