Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Tractive effort is required to:a)Accelerate t... Start Learning for Free
Tractive effort is required to:
- a)Accelerate the train mass
- b)Overcome the train resistance (friction windage and curve resistance)
- c)Overcome the effect of gravity
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Tractive effort is required to:a)Accelerate the train massb)Overcome t...
Tractive effort is the force acting on the wheel of locomotive which is necessary to propel the train. It is a vector quantity always acting tangential to the wheel of a locomotive. It is measured in newton.
The net effective force or the total tractive effort (Ft) on the wheel of a locomotive or a train to run on the track is equals to the sum of tractive effort:
a) Required for linear and angular acceleration (Fa)
b) To overcome the effect of gravity (Fg)
c) To overcome the frictional resistance to the motion of the train (Fr)
Ft = Fa + Fg + Fr
Most Upvoted Answer
Tractive effort is required to:a)Accelerate the train massb)Overcome t...
Understanding Tractive Effort in Trains
Tractive effort is essential for the efficient operation of trains. It is the force exerted by the train's wheels to move the train forward and is influenced by several factors. Here’s a breakdown of why tractive effort is required:
1. Accelerate the Train Mass
- Tractive effort is needed to overcome inertia when starting and to accelerate the train to the desired speed.
- The greater the mass of the train, the more tractive effort is required to achieve acceleration.
2. Overcome Train Resistance
- Trains face resistance due to friction, windage, and curve resistance.
- Friction arises between the train wheels and the track, while windage is caused by air resistance as the train moves.
- Curve resistance occurs when the train navigates turns, requiring additional force to maintain speed.
3. Overcome the Effect of Gravity
- When trains travel on inclined tracks, they must exert additional tractive effort to counteract gravitational forces.
- This is especially relevant in hilly or mountainous terrains where the gradient can significantly affect performance.
Conclusion
- Therefore, tractive effort is vital for all these functions: to accelerate the train mass, overcome resistance, and counteract gravity.
- The correct answer, "D) All of the above," reflects the comprehensive role of tractive effort in ensuring smooth and efficient train operations across varying conditions.
Tractive effort is essential for the efficient operation of trains. It is the force exerted by the train's wheels to move the train forward and is influenced by several factors. Here’s a breakdown of why tractive effort is required:
1. Accelerate the Train Mass
- Tractive effort is needed to overcome inertia when starting and to accelerate the train to the desired speed.
- The greater the mass of the train, the more tractive effort is required to achieve acceleration.
2. Overcome Train Resistance
- Trains face resistance due to friction, windage, and curve resistance.
- Friction arises between the train wheels and the track, while windage is caused by air resistance as the train moves.
- Curve resistance occurs when the train navigates turns, requiring additional force to maintain speed.
3. Overcome the Effect of Gravity
- When trains travel on inclined tracks, they must exert additional tractive effort to counteract gravitational forces.
- This is especially relevant in hilly or mountainous terrains where the gradient can significantly affect performance.
Conclusion
- Therefore, tractive effort is vital for all these functions: to accelerate the train mass, overcome resistance, and counteract gravity.
- The correct answer, "D) All of the above," reflects the comprehensive role of tractive effort in ensuring smooth and efficient train operations across varying conditions.
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