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Three Phase Induction Motors

Three Phase Induction Motors
The term cogging is associated with

Induction motors
Dc series motors
Compound generators
Three phase transformer

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always less than the number of
Always greater than the number of
Always eqaul to the number of
Either more or less than the number of

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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
Slip ring motor only but not with squirrel cage induction motor
None of these

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

80 to 90%
95 to 98 %
60 to 90%
99%

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Harmonics developed in the rotor
High loads
Low voltage supply
Improper design of machine

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

None of the listed here
Pole changing
Cascade control
Rheostatic control

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MORE MCQ ON Three Phase Induction Motors

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