Control of Traction Motors Interview Questions:

Following are the below Control of Traction Motors Interview Questions and Important Questions which is very useful for interviews and exams

1. Describe with the aid of diagrams following methods of speed control for dc traction motors, pointing out the merits of each: (i) series-parallel control. (ii) control by weakening field.  Explain also the conditions under which the speed control by weakening of field is advantageous.

2. Explain with suitable connection diagrams, the resistance control method employed in dc traction drives.

3. Under what circumstances is the field weakening adopted for controlling speed of traction motors and what are the merits and demerits of this method of control ? Illustrate your answer with the help of tractive effort-speed charac­teristics of the locomotive.

4. Explain the method of series-parallel starting of traction motors. Mention its advantages.

5. Discuss the advantages of series-parallel control of starting as compared to the rheostatic starting for a pair of dc traction motors.

6. Explain the starting of dc series motor type traction motor and prove that with the series-parallel method of starting the efficiency of starter is increased from 50% in case of normal rheostatic starting to 66.67%.

7. Distinguish between shunt and bridge transition methods of starting a pair of dc traction motors.

8. Draw and explain the complete view of drum controller giving shunt transition between two series traction motors.

9. Explain the short-circuit transition method of control of a pair of tram motors and give the developed view of the drum of a controller arranged for this method of control, indicating also the connections of the reversing barrel.

10. Give a schematic power diagram of 1,500 V dc train equip­ment of 2 dc series motors wired for series-parallel opera­tion during starting and explain it.

11. Explain with relevant diagrams the method of metadyne control of electric traction motors.

12. Describe with a neat connection diagram the principle of operation of a metadyne set to be used for starting the series traction motor. What are the advantages of variator and regulator windings ?

13. Describe with a neat diagram the principle of operation of a metadyne set to be used for starting of the series traction motor.

14. Discuss the advantages and disadvantages of thyristor control of electric traction.

15. Discuss the advantages and disadvantages of thyristor con­trol of traction motors.

16. Explain the chopper method of control of dc motors. What are the merits and demerits of the above method of control ?

17. Describe the contactor method of tap changing for the control of speed and torque of a single phase series motor.

18. Compare the use of dc series motor and ac series motor in electric traction. Discuss the controllers used for such motors.

19. Explain any one method of speed control of induction motor. What speed range is obtainable by this method ?

20. What are the requirements of electric drives for traction ? Explain a static control scheme used in ac traction em­ploying ac motors.

21. Write short notes on the following:

• Speed control of dc series motors.
• Series-parallel control of starting for pair of dc traction motors.
• Series-parallel control of dc series motors.
• Energy saving with series-parallel starting.
• Tramway controller.
• Metadyne control.
• Thyristor control of electric traction.
• Speed control and starting of single phase ac series motors.
• Drum controller.