The direction of rotation of a D.C. series motor can be changed by___________?

Related Mcqs:

1. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?

   A. Lenz’s law B. Faraday’s law C. Coloumb’s law D. Fleming’s left-hand rule...

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. According to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?

   A. current in the conductor aovtaat of conductor C. resultant force on conductor D. none of the above...

7. 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...

8. In which of the following applications D.C. series motor is invariably tried?

   A. Starter for a car B. Drive for a water pump C. Fan motor D. Motor operation in A.C. or D.C...

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

   A. proportional to the armature current B. proportional to the square of the armature current C. proportional to field current D. inversely proportional to the armature current...

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...