Q.1
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
  • improve power factor
  • increase overload capacity
  • reduce fluctuations in torque
  • to improve torque
Q.2
Which of the following motor will have relatively higher power factor ?
  • Capacitor run motor
  • Shaded pole motor
  • Capacitor start motor
  • Split phase motor
Q.3
The range of efficiency for shaded pole motors is
  • 95% to 99%
  • 80% to 90%
  • 50% to 75%
  • 5% to 35%
Q.4
Which of the following motor will give relatively high starting torque ?
  • Capacitor start motor
  • Capacitor run motor
  • Split phase motor
  • Shaded pole motor
Q.5
The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be
  • At the end connections
  • At the end terminals
  • Anywhere on the winding inside a slot
  • At the slot edge where coil enters or comes out of the slot
Q.6
The speed control of universal motor used for sewing machines is by
  • friction
  • varying the resistance
  • tapping the field
  • centrifugal mechanism
Q.7
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
  • fans
  • blowers
  • sound equipment
  • mixer grinders
Q.8
Which of the following motors can be run on AC. as well as D.C. supply ?
  • Universal motor
  • Repulsion motor
  • Synchronous motor
  • Reluctance motor
Q.9
Which of the following motors is used in a situation where load increases with speed ?
  • Induction motor
  • Three-phase series motor
  • Schrage motor
  • Hysteresis motor
0 h : 0 m : 1 s