In three-phase squirrel-cage induction motors____________?

Related Mcqs:

1. The starting torque of a 3-phase squirrel cage induction motor is____________?

   A. twice the full load torque B. 1.5 times the full load torque C. equal to full load torque...

2. The number of slip rings on a squirrel cage induction motor is usually____________?

   A. two B. three C. four D. none...

3. In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?

   A. reduce windage losses B. reduce eddy currents C. reduce accumulation of dirt and dust D. reduce magnetic hum...

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. A double squirrel-cage induction motor has______________?

   A. two rotors moving in oppsite direction B. two parallel windings in stator C. two parallel windings in rotor D. two series windings in stator...

6. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?

   A. By changing the number of stator poles B. Rotor rheostat control C. By operating two motors in cascade D. By injecting e.m.f. in the rotor circuit...

7. When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered__________?

   A. in series B. in parallel C. in series-parallel D. in parallel with stator...

8. The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?

   A. changing supply frequency B. changing number of poles C. changing winding resistance D. reducing supply voltage...

9. 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...

10. 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...