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Three Phase Induction Motors

Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

High speed motors
Variable speed motors
High horsepower motors
Low horsepower motors

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

4%
Less than 1%
2%
1.5 %

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Shaft diameter
Rotor emf
Rotor power factor
Rotor current

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
1600 rpm
400 rpm
2400 rpm

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
None of the listed here
Insufficient data
Always revolves in the direction opposite to stator flux

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

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

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MORE MCQ ON Three Phase Induction Motors

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