The torque of a rotor in an induction motor under running condition is maximum
A. At the unit value of slip
B. At the zero value of slip
C. At the value of the slip which makes rotor reactance per phase equal to the resistance per phase
D. At the value of the slip which makes the rotor reactance half of the rotor
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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