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.Management Sciences
Category: Single Phase Induction Motors
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
In a shaded pole single-phase motor, the revolving field is produced by the use of_________?
A. inductor
B. capacitor
C. resistor
D. shading coils
In a universal motor, the most common cause of brush sparking is___________?
A. open armature winding
B. shorted armature winding
C. shorted field winding”
D. high commutator mica
E. all of the above
In a single phase motor the centrifugal switch____________?
A. disconnects auxiliary winding of the motor
B. disconnects main winding of the motor
C. reconnects the main winding the motor
D. reconnects the auxiliary winding of the motor
A.C. series motor as compared to D.C. series motor has__________?
A. smaller brush width
B. less number of field turns
C. more number of armature turns
D. less air gap
E. all of the above
The shaded pole motor is used for__________?
A. high starting torque
B. low starting torque
C. medium starting torque
D. very high starting torque
Which type of load is offered by cranes and hoists ?
A. Gradually varying load
B. Non-reversing, no-load start
C. Reversing, light start
D. Reversing, heavy start
Which of the following motors has two separate windings on the motor ?
A. Repulsion motor
B. Repulsion induction motor
C. Repulsion start induction run motor
D. None of the above
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