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Three Phase Induction Motors

Three Phase Induction Motors
The term cogging is associated with

Dc series motors
Induction motors
Three phase transformer
Compound generators

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Eddy currents
Self induction
Hysteresis
Mutual induction

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(S-1) × rotor input
(1-S) × rotor input
(1+S) × rotor input
S × rotor input

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Large
Absent
Small
Infinity

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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
Maximum at no load
Minimum at no load
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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