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Three Phase Induction Motors

Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

1
0.5
Practically zero
0.2

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

4 poles
2 poles
6 poles
8 poles

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

None of the listed here
25 Hz
60 Hz
50 Hz

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

None of the listed here
Practically zero
Large
Small

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

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

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Decreasing rotor resistance
None of the listed here
Increasing rotor resistance
Increasing rotor reactance

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