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Three Phase Induction Motors

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

25 Hz
50 Hz
None of the listed here
60 Hz

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

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

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Three Phase Induction Motors
The condition of induction motor on load resemble those of a transformer whose secondady is _______

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

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

It is inexpensive
It requires less maintenance
External resistance can be inserted in the rotor circuit
None of the listed here

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

(1-S) × rotor input
None of the listed here
(1+S) × rotor input
S × rotor input

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

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

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