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.Management Sciences
Category: Single Phase Induction Motors
A schrage motor can run on___________?
A. zero slip
B. negative slip
C. positive slip
D. all of the above
Locked rotor current of a shaded pole motor is____________?
A. equal to full load current
B. less than full load current
C. slightly more than full load current
D. several times the full load current
A universal motor can run on___________?
A. A.C. only
B. D.C. only
C. either A.C. or D.C.
D. none of the above
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?
A. damage to the starting winding
B. damage to the centrifugal switch
C. overloading of running winding
D. none of the above
In a hysteresis motor, the rotor must have____________?
A. retentivity
B. resistivity
C. susceptibility
D. none of the above
In split phase motor main winding is of _____________?
A. thin wire placed at the top of the slots
B. thin wire placed at the bottom of the slots
C. thick wire placed at the bottom of the slots
D. thick wire placed at the top of the” slots
The motor used for the compressors is____________?
A. d.c. series motor
B. shaded pole motor
C. capacitor-start capacitor-run motor
D. reluctance motor
Centrifugal switch disconnects the auxiliary winding of the motor at about ______ percent of synchronous speed?
A. 30 to 40
B. 70 to 80
C. 80 to 90
D. 100
Which of the following motor will give the highest starting torque ?
A. D.C. shunt motor
B. Schrage motor
C. Repulsion start and induction run motor
D. Universal motor
Which of the following single-phase motors has relatively poor starting torque ?
A. Universal motor
B. Repulsion motor
C. Capacitor motor
D. All single phase motors have zero starting torque
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