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Three Phase Induction Motors

Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

5%
15 to 20 %
10 to 15%
30 to 50%

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Three Phase Induction Motors
The shaft of induction motor is made of

Hollow
Stiff
Any of the listed here
Flexible

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

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

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

High starting torque is required
High rotor resistance is required during running
Speed control is required
Less costly motor is not required

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Three Phase Induction Motors
The rotor of an induction motor runs at

Any of the above
Synchronous speed
Above synchronous speed
Below synchronous speed

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1-S
1/S
S/1-S
S

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MORE MCQ ON Three Phase Induction Motors

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