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Three Phase Induction Motors

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

Infinity
Small
Large
Absent

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run at reduced speed
The motor will run in reverse direction
The motor will not run
The motor will burn

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

(1-S) × rotor input
(1+S) × rotor input
None of the listed here
S × rotor input

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Phase sequence of supply voltage
Number of poles
Supply frequency
Magnitude of supply voltage

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

4%
1.5 %
2%
Less than 1%

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Negligible
Slightly more than full load torque
Low
Same as full load torque

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MORE MCQ ON Three Phase Induction Motors

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