In medium sized induction motors, the slip is generally around___________?
In medium sized induction motors, the slip is generally around___________?
A. 0.04%
B. 0.4%
C. 4%
D. 14%
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Temperature of the stator winding of a three phase induction motor is obtained by___________?
Temperature of the stator winding of a three phase induction motor is obtained by___________?A. resistance rise method
B. thermometer method
C. embedded temperature method
D. all above methodsA double squirrel-cage induction motor has______________?
A double squirrel-cage induction motor has______________?A. two rotors moving in oppsite direction
B. two parallel windings in stator
C. two parallel windings in rotor
D. two series windings in statorWhich is of the following data is required to draw the circle diagram for an induction motor ?
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 testIn induction motor, percentage slip depends on__________?
In induction motor, percentage slip depends on__________?A. supply frequency
B. supply voltage
C. copper losses in motor
D. none of the aboveA 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?
A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?A. 200 Hz
B. 50 Hz
C. 2 Hz
D. 0.2 HzSlip of an induction motor is negative when_____________?
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