Train Movement and Energy Consumption Interview Questions:

Following are the below Train Movement and Energy Consumption Interview Questions and Important Questions which is very useful for interviews and exams

1. What do you understand by speed-time curves ? What is its use in practice ?

2. Draw the speed-time curves for each of the following traction systems: (1) Tramcar (ii) Diesel electric (iii) Trolley buses (iv) Suburban electric train and (v) Urban services.

3. What is a speed-time curve ? Discuss briefly the distinct periods in a typical speed-time curve of a train running on main line.

4. Draw a typical speed-time curve for train movement, and explain (a) acceleration (b) free running (c) coasting (d) retardation.

5. Draw the speed-time curve for urban service and suburban service train movement and simplify these curves by approximation.

6. Draw and explain general speed-time curve of a train running between two stations. How can this curve be approximated for (a) main line service (b) suburban service ?

7. Sketch the speed-time curves for urban, suburban and main line services. Give the approximate values of acceleration, braking and coasting periods in each case.

8. Discuss the main features of the various train services. What type of train services corresponds to trapezoidal and quadrilateral speed-time curves ?

9. Draw and explain a typical speed-time curve for an electric train and explain what do you understand by crest speed, average speed and schedule speed.

10. Define (i) crest speed, (ii) average speed, (iii) schedule speed.

11. Draw a main line speed-time curve and label its various parts. Derive an expression for maximum speed of a suburban train in terms of total distance travelled, acceleration, retardation and average speed. Assume the speed-time curve to be trapezoidal.

12. Define ‘crest speed’ and ‘schedule speed’ and discuss the factors which affect the schedule speed of a train.

13. Define the terms crest speed, average speed and schedule speed. What are different methods of approximation of speed-time curves ? Derive expressions for distance travelled using quadrilateral approximation method of V(t) curve.

14. Explain mechanics of train movement.

15. Derive an expression for tractive effort required for propulsion of a train during (a) acceleration (b) free running (c) coasting (d) moving down a gradient.

16. Derive an expression for :

• The tractive effort for propulsion of a train on level
• The tractive effort for propulsion of a train up and down a gradient.

17. Explain various functions that the tractive effort exerted by traction unit is supposed to perform and derive an expression for total tractive effort.

18. Deduce the expressions for:

• The tractive effort exerted by road wheel in terms of wheel diameter, motor torque, gear ratio and efficiency of transmission of power through gears.
• The tractive effort for the propulsion of train up and down the gradient.

19. What is coefficient of adhesion ? How does it affect slipping of the driving wheels of the traction unit ?

20. Comment on the following statements:

• The adhesion coefficient of a locomotive employing dc shunt motor will be higher than the using dc series
• A higher ratio of adhesive weight to total weight is desirable for suburban trains, where the distance between the consecutive stops is very small.

21. Explain the terms (i) coefficient of adhesion (ii) tractive effort and (iii) gradient.

22. What do you mean by specific energy consumption ? What are the factors that affect specific energy consumption of a train ?

23. What are the factors which affects the specific energy consumption in electric trains ?

24. Discuss various factors affecting specific energy consumption in the traction.

25. Derive equation of motion of a vehicle. How does the effective mass of a vehicle differ with its physical (actual) mass ? Explain significance of equation of motion in energy consumption calculations.

26. Derive a simple expression for the maximum power output of traction motors in terms of tractive effort, maximum speed and efficiency of transmission gear.

27. Derive an expression for specific energy consumption of a suburban train for a typical inter-station run.

28. Differentiate between adhesive weight and total weight of an electric locomotive.

29. Explain the terms ‘dead weight’, ‘effective weight’ and ‘adhesive weight’ in a locomotive.

30. Define (i) adhesive weight (ii) coefficient of adhesion (iii) Tractive effort.

31. Write short notes on the following

• Speed-time curve.
• Mechanics of train movement.
• Tractive effort for propulsion of train.
• Factors affecting energy consumption in propelling a train.
• Specific energy consumption.
• Dead weight, accelerating weight and adhesive weight of a train.