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Three Phase Induction Motors

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 _______

980 W
200 W
20 W
500 W

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

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

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Independent of
Directly proportional to
None of the listed here
Directly proportional to sqaure of

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Having number of rotor slots more or less than the number of stator slots
Using DOL starter
Auto transformer starter
Proper ventilation

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Partly star and partly delta
Star
Delta

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

1000 rpm
730 rpm
2880 rpm
1440 rpm

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