A. End play
B. Air gap
C. Insulation in rotor
D. Balancing of rotor
Related Mcqs:
- If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?
A. Universal motor
B. Shaded pole type motor
C. Capacitor start motor
D. Capacitor start and run motor - 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 - The speed of a universal motor is generally reduced by using_________?
A. gear trains
B. V-belts
C. brakes
D. chains - The speed of a universal motor is usually reduced by using____________?
A. gearing
B. belts
C. brakes
D. chains - 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 - The speed control of universal motor used for sewing machines is by____________?
A. friction
B. varying the resistance
C. tapping the field
D. centrifugal mechanism - The speed/load characteristics of a universal motor is same as that of_____________?
A. A.C. motor
B. D.C. shunt motor
C. D.C. series motor
D. none of the above - 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 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 - 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
