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.Management Sciences
Category: Single Phase Induction Motors
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
The value of starting capacitor of a fractional horse power motor will be__________?
A. 100 uF
B. 200 uF
C. 300 uF
D. 400 uF
In case of high speed universal motor which of the following needs more attention?
A. End play
B. Air gap
C. Insulation in rotor
D. Balancing of rotor
A centrifugal switch is used to dis- connect ‘starting winding when motor has___________?
A. run for about 1 minute
B. run for about 5 minutes
C. picked up about 50 to 70 per cent of rated speed
D. picked up about 10 to 25 per cent of rated speed
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