A 3 phase squirrel case induction motor has a full load

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A 3 phase squirrel case induction motor has a full load efficiency of 0.8 and a maximum efficiency of 0.9. If it is operated at a slip of 0.6 by applying a reduced voltage, then efficiency of the motor at this operating point

1. less than 0.4
2. greater than 0.6
3. in the range of 0.8 to 0.1
4. none of these

Correct Option: A

NA