What is the relation of the rotor resistance to efficiency and losses?(a) as rotor resistance, losses increase, efficiency increases(b) as rotor resistance, losses increase, efficiency decreases(c) as rotor resistance, losses decrease, efficiency has no change(d) as rotor resistance, losses decrease, efficiency decreasesI got this question in exam.The doubt is from Design of Rotor Bars and Slots topic in chapter Three Phase Induction Motor of Design of Electrical Machines

What is the relation of the rotor resistance to efficiency and losses?

1.	What is the relation of the rotor resistance to efficiency and losses?(a) as rotor resistance, losses increase, efficiency increases(b) as rotor resistance, losses increase, efficiency decreases(c) as rotor resistance, losses decrease, efficiency has no change(d) as rotor resistance, losses decrease, efficiency decreasesI got this question in exam.The doubt is from Design of Rotor Bars and Slots topic in chapter Three Phase Induction Motor of Design of Electrical Machines
Answer» Right choice is (B) as rotor resistance, LOSSES increase, efficiency decreases The best I can explain: As the rotor resistance INCREASES, the I^2R losses increases and cause HEATING EFFECTS. This increase in losses decreases efficiency.

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