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Three Phase Induction Motors

Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Equal to stator poles
None of the listed here
Prime number
Even number

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

Flexible
Any of the listed here
Hollow
Stiff

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.2
Practically zero
1
0.5

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Three Phase Induction Motors
A 3 phase induction motor is ________

Essentially a constant speed motor
Not easily maintainable
A variable speed motor
Very costly

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Small
None of the listed here
Large
Practically zero

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

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

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