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Three Phase Induction Motors

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

Any of the listed here
Flexible
Hollow
Stiff

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Three Phase Induction Motors
Very large 3-phase induction motors (greater than 25 HP) are started _____

By auto transformer starting
Direct on line
Star-delta starting
None of the listed here

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

Large
Very large
1
As small as possible

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

None of the listed here
Large
Practically zero
Small

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Delta
Star
Partly star and partly delta

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

5%
15 to 20 %
30 to 50%
10 to 15%

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