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Three Phase Induction Motors

Three Phase Induction Motors
The maximum torque in an induction motor depends on

All of the listed here
Square of supply voltage
Frequency
Rotor inductive reactance

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply voltage
Supply frequency
None of these
Copper losses in motor

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

Small
Practically zero
None of the listed here
Large

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

Practically zero
0.2
1
0.5

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

Very large
1
As small as possible
Large

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

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

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