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THREE PHASE INDUCTION MOTORS

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

As small as possible
1
Large
Very large

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
1-S
1+S
S-1

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Minimum at no load
None of the listed here
Maximum at no load
Remains the same at all loads

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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
Practically zero
Large
Small

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Large slip
High reactance
Low resistance
high resistance

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