Slip of an induction motor is negative when
A. Magnetic field and rotor rotate in opposite direction
B. Rotor speed is less than the synchronous speed of the field and are in the same direction
C. Rotor speed is more than the synchronous speed of the field and are in the same direction
D. None of the above
Answer: Option C
This Question Belongs to Electrical Engineering >> Polyphase Induction Motors
Which is of the following data is required to draw the circle diagram for an induction motor?
A. Block rotor test only
B. No load test only
C. Block rotor test and no-load test
D. Block rotor test, no-load test and stator resistance test
The starting torque of a three phase induction motor can be increased by
A. Increasing slip
B. Increasing current
C. Both (A) and (B)
D. None of the above
Rotor rheostat control method of speed control is used for
A. Squirrel-cage induction motors only
B. Slip ring induction motors only
C. Both (A) and (B)
D. None of the above
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