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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The term cogging is associated with

Three phase transformer
Compound generators
Dc series motors
Induction motors

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Slip
Running torque
Line voltage
Rotor current

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

inversely proportional to rotor reactance at standstill
Inveresly proportional to supply voltage
None of the listed here
Directly proportional to rotor resistance

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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
2400 rpm
400 rpm
1600 rpm

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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 ______

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

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