Question

Differential lock in a tractor is used to improve

• A. Lateral stability
• B. Hydraulic lift
• C. Braking performance
• D. Traction of wheel

Hint:

Differential allows smooth turning.
Differential lock locks both axles together in mud to maximize tractive pull.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The standard automotive differential delivers equal torque to both rear drive wheels, which causes the entire tractor to lose traction if one wheel enters a slippery/muddy patch.

Step 2: Detailed Explanation:
Under normal operation, a differential allows the drive wheels to rotate at different speeds during turns.
However, in wet, slippery, or loose soils, if one wheel loses grip, the standard differential spins that wheel freely, delivering near-zero torque to the other wheel and stranding the tractor.
Engaging the differential lock mechanically couples both half-axles together so they rotate at identical speeds.
This forces the wheel with good soil traction to pull the tractor forward out of the mud, drastically improving wheel traction.

Step 3: Final Answer:
Hence, differential lock is used to improve Traction of wheel, corresponding to option (D).