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Three Phase Induction Motors

Three Phase Induction Motors
The induction motor has lagging power factor during

Starting only
None of the listed here
Operation only
Both starting and operation

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Bronze
Cast iron
Aluminium
Silicon steel

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

Lower cage winding has low reactance
None of the listed here
Outer cage winding has good pf
Lower winding is more effective

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Three Phase Induction Motors
An induction motor is

Self starting with zero torque
Self starting with low torque
Non self starting
Self starting with high torque

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

Large
Very large
As small as possible
1

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Three Phase Induction Motors
Reduced voltage starter can be used with

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

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MORE MCQ ON Three Phase Induction Motors

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