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Three Phase Induction Motors

Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High resistance
None of the listed here
High inductance
Low resistance

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing winding resistance
Changing number of poles
Reducing supply voltage
Changing supply frequency

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

All of these
Stator resistance test
Blocked rotor test
No-load test

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

Pole changing
Cascade control
None of the listed here
Rheostatic control

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

Silicon steel
Cast iron
Aluminium
Bronze

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

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

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