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Three Phase Induction Motors

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

0.2 leading
0.2 lagging
0.5 leading
Unity

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Greater than
Smaller than
None of the listed here
Equal to

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

Silicon steel
Cast iron
Bronze
Aluminium

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

Shaft
None of these
Bearings
Stator core

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run in reverse direction
The motor will run at reduced speed
The motor will not run
The motor will burn

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

Lower cage winding has low reactance
Lower winding is more effective
Outer cage winding has good pf
None of the listed here

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