A. damage to the starting winding
B. damage to the centrifugal switch
C. overloading of running winding
D. none of the above
Related Mcqs:
- 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 - If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?
A. motor will not come up to speed
B. motor will not carry the load
C. current drawn by the motor will be excessively high
D. electrolytic capacitor will, in all probability, suffer break down - 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 - In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?
A. become unstable
B. draw excessive armature current and may burn out
C. fall out of synchronism and come to stand still
D. run as induction motor - 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 - The starting winding of a single-phase motor is placed in_________?
A. armature
B. field
C. rotor
D. stator - In case of a shaded pole motor the direction of rotation of the motor is__________?
A. from main pole to shaded pole
B. from shaded pole to main pole
C. either of the above depending on voltage
D. either of the above depending on power factor - 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 - Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________?
A. it is comparatively cheaper
B. it has almost non-destructible capacitor
C. it has low starting as well as running currents at relatively high power factor
D. it is quiet in operation - Speed control of a universal motor is achieved by__________?
A. varying field flux with tapped field windings
B. connecting rheostat in series
C. applying variable voltage by means of silicon controlled rectifier
D. applying variable voltage by means of variable auto-transformer
E. all of the above methods
