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Three Phase Induction Motors

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

Large
None of the listed here
Practically zero
Small

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Bigger
Same
Smaller
Any of the listed here

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Increases the rotor current
Rotor current becomes zero
Decreases the rotor current
Rotor current remains same

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Three Phase Induction Motors
Reduced voltage starter can be used with

Squirrel cage as well as slip ring induction motor
Slip ring motor only but not with squirrel cage induction motor
Squirrel cage induction motor only but not with slip ring motor
None of these

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

high resistance
High reactance
Low resistance
Large slip

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

300 rpm
600 rpm
1200 rpm
1000 rpm

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