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Three Phase Induction Motors

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

Silicon steel
Bronze
Cast iron
Aluminium

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing number of poles
Reducing supply voltage
Changing winding resistance
Changing supply frequency

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Three Phase Induction Motors
The term cogging is associated with

Compound generators
Three phase transformer
Induction motors
Dc series motors

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

40%
65%
90%
None of the listed here

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Rheostatic control
Cascade control
None of the listed here
Pole changing

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

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

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