In Ward-Leonard control the lower limit of speed is imposed by________?

Related Mcqs:

1. Speed control by Ward Leonard method gives uniform speed variation_____________?

   A. in one direction B. in both directions C. below normal speed only D. above normal speed only...

2. Ward Leonard method of speed control is basically a______________?

   A. field control method B. armature controlled method C. field diverter D. frequency control method...

3. Ward-Leonard control is basically a____________?

   A. voltage control method B. field divertor method C. field control method D. armature resistance control method...

4. The main disadvantage of the Ward-Leonard control method is______________?

   A. high initial cost B. high maintenance cost C. low efficiency at Hght loads D. all of the above...

5. The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?

   A. decreasing the field current B. increasing the field current C. decreasing the armature current D. increasing the armature current...

6. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?

   A. 2.36% B. 4.76% C. 6.77% D. 8.84%...

7. The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?

   A. reducing the field current B. decreasing the armature current C. increasing the armature current D. increasing the excitation current E. none of the above methods...

8. No-load speed of which of the following motor will be highest ?

   A. Shunt motor B. Series motor C. Cumulative compound motor D. Differentiate compound motor...

9. Usually wide and sensitive speed control is desired in case of____________?

   A. centrifugal pumps B. elevators C. steel rolling mills D. colliery winders...

10. With the increase in temperature, the speed of DC series motor______________?

    A. decreases B. increases C. remain same D. none of the above...