Allied & ICAR Exam Bank • ALLIED_1125 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Tractor Ballasting

Question Statement:

Why is cast iron wheel weight or liquid ballast (water/calcium chloride) added to tractor rear drive wheels?

Options:

  • (A) To increase dynamic normal load, reduce excessive tire slip, and maximize tractive effort
  • (B) To increase maximum engine torque
  • (C) To decrease tractor rolling resistance
  • (D) To increase tractor road traveling speed

Answer Key:

A

Step-by-Step Solution & Explanation

Adding ballast on the drive axle increases the available tractive force ($H = c A + W \tan \phi$), keeping tire slip within the optimum $10\text{ to }15\%$ zone for heavy draft operations.
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