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Three Phase Induction Motors

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

Bronze
Aluminium
Silicon steel
Cast iron

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Three Phase Induction Motors
The low power factor of induction motor is due to

All of these
The reactive lagging magnetizing current necessary to generate the magnetic flux
Rotor leakage reactance
Stator reactance

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Four
Three
Two
One

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

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

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
95 to 98 %
60 to 90%
80 to 90%

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

Stator core
None of these
Bearings
Shaft

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