The frame of an induction motor is usually made of____________?

Related Mcqs:

1. 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

2. In the squirrel-cage induction motor the rotor slots are usually given slight skew__________?

   A. to reduce the magnetic hum and locking tendency of the rotor
   B. to increase the tensile strength of the rotor bars
   C. to ensure easy fabrication
   D. none of the above

3. The torque of an induction motor is___________?

   A. directly proportional to slip
   B. inversely proportional to slip
   C. proportional to the square of the slip
   D. none of the above

4. The starting torque of a squirrel-cage induction motor is___________?

   A. low
   B. negligible
   C. same as full-load torque
   D. slightly more than full-load torque

5. The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?

   A. star connected only
   B. delta connected only
   C. A. and B. both
   D. none of the above

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

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

7. Slip of an induction motor is negative when_____________?

   A. magnetic field and rotor rotate in opposite direction
   B. rotor speed is less than the synchronous speed of the field and are in the same direction
   C. rotor speed is more than the synchronous speed of the field and are in the same direction
   D. none of the above

8. 5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?

   A. 730 r.p.m.
   B. 960 r.p.m.
   C. 1440 r.p.m.
   D. 2880 r.p.m.

9. The circle diagram for an induction motor cannot be used to determine____________?

   A. efficiency
   B. power factor
   C. frequency
   D. output

10. A squirrel cage induction motor is not selected when___________?

    A. initial cost is the main consideration
    B. maintenance cost is to be kept low
    C. higher starting torque is the main consideration
    D. all above considerations are involved