D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?

Related Mcqs:

1. 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

2. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be_____________?

   A. level compounded
   B. under compounded
   C. cumulatively compounded
   D. differentially compounded

3. 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%

4. By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

   A. Frame
   B. Shaft
   C. Commutator
   D. Stator

5. One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven_______________?

   A. runs as a generator
   B. does not run as a generator
   C. also runs as a motor comes to stop after sometime

6. 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

7. If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?

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

8. As -the load is increased the speed of D.C. shunt motor will____________?

   A. reduce slightly
   B. increase slightly
   C. increase proportionately
   D. remains unchanged

9. Which motor should not be started on no-load ?

   A. Series motor
   B. Shunt motor
   C. Cumulatively compounded motor
   D. Differentially compounded motor

10. 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