In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?

Related Mcqs:

1. For which of the applications a reluctance motor is preferred ?

   A. Electric shavers B. Refrigerators C. Signalling and timing devices D. Lifts and hoists...

2. 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...

3. 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...

4. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?

   A. damage to the starting winding B. damage to the centrifugal switch C. overloading of running winding D. none of the above...

5. 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...

6. 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...

7. 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...

8. 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...

9. 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...

10. A reluctance motor____________?

    A. is self-starting B. is constant speed motor C. needs no D.C. excitation D. all of the above...