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Q. |
A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is greater than stator frequency? |
A. | rotor will be driven against rmf |
B. | rotor will be driven in direction of rmf |
C. | no emf will be induced |
D. | the losses will be maximum |
Answer» A. rotor will be driven against rmf | |
Explanation: as the rotor rotates at larger speed than the stator, the rmf speed is less than the rotor speed and it tries to rotate in the opposite direction to rmf. |
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