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THREE PHASE INDUCTION MOTORS

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 a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

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

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

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

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

Large
None of the listed here
Small
Practically zero

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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 resistance
Low resistance
High reactance

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