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Three Phase Induction Motors

Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

None of the listed here
Low resistance
High resistance
High inductance

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

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

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

Large
1
As small as possible
Very large

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are decreased
No load current is decreased
Leakage reactances are increased
None of the listed here

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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%
None of the listed here
65%
90%

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