Polyphase Induction Motors – Page 9 – HI MCQ!

The efficiency of an induction motor is …… than that of a transformer?

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Which of the following AC. motors is used for industrial application?

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If stator voltage of a squirrel cage induction motor is reduced to one-half its. normal value, its starting current is reduced to … .. percent of its full voltage value?

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Whenever any polyphase induction motor is loaded?

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Under average service conditions, motor bearings may be safely operated at temperatures upto?

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During starting if an induction motor hums, the probable cause could be?

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For a 50 H.P. motor, which type of rotor will be preferred?

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Type of bearing used for 25 H.P. motor?

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Blocked rotor test on induction motors is used to find out?

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The value of transformation ratio of an induction motor can be found by?

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