The speed of a D.C. series motor is_____________?

Related Mcqs:

1. 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%...

2. In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

   A. 100% of the previous value B. 50% of the previous value C. 25% of the previous value D. 10% of the previous value E. none of the above...

3. 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...

4. 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...

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. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?

   A. increase B. decrease C. remain same D. become zero...

7. 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...

8. 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...

9. A D.C. series motor is that which______________?

   A. has its field winding consisting of thick wire and less turns B. has a poor torque C. can be started easily without load D. has almost constant speed...

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...