D.C. generators are installed near the load centres to reduce_____________?

Related Mcqs:

1. D.C. generators are normally designed for maximum efficiency around_____________?

   A. full-load
   B. rated r.p.m.
   C. rated voltage
   D. all of the above

2. 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%

3. D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this______________?

   A. series motor
   B. shunt motor
   C. compound motor
   D. any of the above

4. In D.C. shunt motors as load is reduced__________________?

   A. the speed will increase abruptly
   B. the speed will increase in proportion to reduction in load
   C. the speed will remain almost/constant
   D. the speed will reduce

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 ratio of starting torque to full-load torque is least in case of____________?

   A. series motors
   B. shunt motors
   C. compound motors
   D. none of the above

7. For the same H.P. rating and full load speed, following motor has poor starting torque_____________?

   A. shunt
   B. series
   C. differentially compounded
   D. cumulativelyc’ompounded

8. If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens____________?

   A. this will make armature to take heavy current, possibly burning it
   B. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
   C. nothing will happen to motor
   D. motor will come to stop

9. If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?

   A. increase in armature current
   B. increase in flux
   C. decrease in reactance
   D. decrease in back emf

10. A dc series motor should not be started on no load because it would___________?

    A. not develop starting torque
    B. fail to start without load
    C. run at dangerously high speed
    D. draw more current without producing sufficient torque