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THREE PHASE INDUCTION MOTORS

Three Phase Induction Motors
The frame of an induction motor is usually made of

Cast iron
Silicon steel
Aluminium
Bronze

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Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

0.2 leading
0.5 leading
0.2 lagging
Unity

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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
Auto transformer starter
Proper ventilation

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Three Phase Induction Motors
The term cogging is associated with

Dc series motors
Three phase transformer
Induction motors
Compound generators

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Improper design of machine
High loads
Low voltage supply
Harmonics developed in the rotor

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