Question

Given below are two statements
Statement I: Weight transfer from drawbar pull, increases the soil reaction against front wheels and decreases the reaction against rear wheel.
Statement II: For towed wheel axle torque is zero and for self propelled wheel pull is zero.
In light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are correct
• B. Both Statement I and Statement II are incorrect
• C. Statement I is correct but Statement II is incorrect
• D. Statement I is incorrect but Statement II is correct

Hint:

Tractor weight transfer always shifts load from the front axle to the rear axle.
This increases rear tire traction, which is crucial for pulling heavy implements.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This question evaluates the force dynamics of a tractor-implement system, focusing on wheel forces and weight transfer during operation.
Detailed Explanation:
Let us analyze Statement I:
When a tractor pulls an implement, the drawbar pull creates a backward-tipping rotational moment about the rear wheel contact point.
This moment shifts weight off the front axle and onto the rear axle.
As a result, the vertical soil reaction on the front wheels decreases, while the vertical soil reaction on the rear wheels increases.
Statement I claims the opposite (that front wheel reaction increases), so Statement I is incorrect.
Let us analyze Statement II:
We can classify wheels based on how they receive power:
- Towed Wheel: A towed wheel has no engine torque applied to its axle.
It is pulled along by the vehicle frame, so its axle torque is zero (\(T = 0\)).
- Self-Propelled Wheel: A self-propelled wheel has axle torque applied to rotate it, but it only produces enough tractive force to move itself forward.
Since it does not pull any external load, its net drawbar pull is zero (\(P = 0\)).
Therefore, Statement II is correct.

Step 2: Final Answer:
Statement I is incorrect, but Statement II is correct.