In three-phase squirrel-cage induction motors
A. Rotor conductor ends are short-circuited through slip rings
B. Rotor conductors are short-circuited through end rings
C. Rotor conductors are kept open
D. Rotor conductors are connected to insulation
Answer: Option B
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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