The shaft of an induction motor is made of_____________?

Related Mcqs:

1. Which type of bearing is provided in small induction motors to support the rotor shaft ?

   A. Ball bearings B. Cast iron bearings C. Bush bearings D. None of the above...

2. Slip ring motor is preferred over squirrel cage induction motor where___________?

   A. high starting torque is required B. load torque is heavy C. heavy pull out torque is required D. all of the above...

3. An induction motor is identical to_________?

   A. D.C. compound motor B. D.C. series motor C. synchronous motor D. asynchronous motor...

4. The crawling in the induction motor is caused by____________?

   A. low voltage supply B. high loads C. harmonics develped in the motor D. improper design of the machine E. none of the above...

5. In the circle diagram for induction motor, the diameter of the circle represents____________?

   A. slip B. rotor current C. running torque D. line voltage...

6. In a three-phase induction motor, the number of poles in the rotor winding is always__________?

   A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator...

7. A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will____________?

   A. stall after sometime B. stall immediately C. continue to run at lower speed without damage D. get heated and subsequently get damaged...

8. A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be__________?

   A. 0.01 B. 0.02 C. 0.03 D. 0.04...

9. In an induction motor if air-gap is increased__________?

   A. the power factor will be low B. windage losses will be more C. bearing friction will reduce D. copper loss will reduce In an induction motor...

10. The starting torque of a three phase induction motor can be increased by__________?

    A. increasing slip B. increasing current C. both A. and (b) D. none of the above...