Ward-Leonard control is basically a____________?

Related Mcqs:

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

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

2. 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

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

   A. residual magnetism of the generator
   B. core losses of motor
   C. mechanical losses of motor and generator together
   D. all of the above

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. 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

6. The type of D.C. motor used for shears and punches is_____________?

   A. shunt motor
   B. series motor
   C. differential compoutid D.C. motor
   D. cumulative compound D.C. motor

7. Which of the following load normally needs starting torque more than the rated torque?

   A. Blowers
   B. Conveyors
   C. Air compressors
   D. Centrifugal pumps

8. For which of the following applications a D.C. motor is preferred over an A.C. motor ?

   A. Low speed operation
   B. High speed operation
   C. Variable speed operation
   D. Fixed speed operation

9. For constant torque drive which speed control method is preferred ?

   A. Field control
   B. Armature voltage control
   C. Shunt armature control
   D. Mechanical loading system

10. In the D.C. motor the iron losses occur in____________?

    A. the field
    B. the armature
    C. the brushes
    D. the commutator