If the dynamic weight on the front axle is lesser than 20% of the total weight of tractor, the longitudinal instability of tractor can be avoided by __________.
Options:
(A) adding weight on the rear axle
(B) adding weight on the front axle
(C) reducing weight on the rear axle
(D) reducing weight on the front axle
Official Answer Key:
B
Step-by-Step Solution & Explanation
Longitudinal instability is the tendency of the tractor to rear up about the rear axle (backward overturning). It becomes a hazard when the dynamic load on the front wheels falls too low — the accepted design minimum is about 20 % of the total weight, needed to retain both stability and steering control.
The direct remedy is to add ballast on the front axle (front-mounted weights), which restores the front-axle share of the load and moves the centre of gravity forward.
Why not the others: adding weight on the rear axle (A) worsens the imbalance; reducing rear weight (C) is impractical, since rear weight is required for traction; reducing front weight (D) aggravates the very problem.
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