A. is self-starting
B. is constant speed motor
C. needs no D.C. excitation
D. all of the above
Related Mcqs:
- In a split phase motor____________?
A. the starting winding is connected through a centrifugal switch
B. the running winding is connected through a centrifugal switch
C. both starting and running windings are connected through a centrifugal switch
D. centrifugal switch is used to control supply voltage - In repulsion motor direction of rotation of motor____________?
A. is opposite to that of brush shift
B. is the same as that of brush shift
C. is independent of brush shift - In a ceilingfan employing capacitor run motor____________?
A. secondary winding surrounds the primary winding
B. primary winding surrounds the secondary winding
C. both are usual arrangements
D. none of the above - For which of the applications a reluctance motor is preferred ?
A. Electric shavers
B. Refrigerators
C. Signalling and timing devices
D. Lifts and hoists - Which of the following statements regarding reluctance-start motor is incorrect ?
A. It is similar to reluctance motor
B. It is basically an induction motor and not a synchronous one
C. So far as its basic working principle is concerned, it is similar to shaded pole motor
D. the air-gap between rotor and salient poles is non- uniform - 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 - Which of the following statements regarding a reluctance motor is incorrect ?
A. It cannot be reversed, ordinarily
B. It requires no D.C. field excitation for its operation
C. It is nothing else but a single-phase, salient pole synchronous-induction motor
D. Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path between stator and rotor - In a shaded pole motor, the shading coil usually consist of___________?
A. a single turn of heavy wire which is in parallel with running winding
B. a single turn of heavy copper wire which is short-circuited and carries only induced current
C. a multilayer fine gauge copper wire in parallel with running winding
D. none of the above - Which of the following single-phase motors is suitable for timing and control purposes ?
A. Reluctance motor
B. Series motor
C. Repulsion motor
D. Universal motor - Locked rotor current of a shaded pole motor is____________?
A. equal to full load current
B. less than full load current
C. slightly more than full load current
D. several times the full load current
