AC THREE PHASE MOTOR - Practice Mode

1) Which method is applied to control the speed of 3 phase squirrel cage induction motor from its rotor side?

Cascade operation Changing applied voltage Changing applied frequency Changing the number of poles

Correct Answer: Cascade operation

2) Which loss of 3 phase induction motor is determined by blocked rotor test

Copper loss Friction loss Hysteresis loss Eddy current loss

Correct Answer: Copper loss

3) Why pre heating is necessary for motors before varnishing in rewinding process?

To dry the varnish quickly in winding To easy flow of varnish in the winding To increase the insulation resistance value To drive out the moisture in between winding layers

Correct Answer: To drive out the moisture in between winding layers

4) Which type of test is conducted using internal growler in AC motor winding?

Ground test Polarity test Continuity test Short circuit test

Correct Answer: Short circuit test

5) Which device is used to test stator winding short and open fault?

Tong Tester Internal Growler External Growler Digital multimeter

Correct Answer: Internal Growler

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