Subtopic: Diesel and petrol properties (calorific value, density, flash point)
Question Statement:
Which of the following statements is/are CORRECT regarding tractor hydraulic 3-point hitch systems?
Options:
(A) Position control maintains the implement at a constant depth relative to the tractor chassis regardless of soil resistance changes
(B) Draft control senses draught force changes and automatically raises or lowers the implement to maintain uniform tractor engine load
(C) The top link is typically subjected to compression during heavy ploughing with fully mounted implements
(D) In free-link operation, the implement depth is governed entirely by its own gauge wheel
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
1. Position control holds the rockshaft at a fixed angular position, fixing implement depth. (A is correct)
2. Draft control senses top-link or lower-link deflection and adjusts depth dynamically to maintain constant draft. (B is correct)
3. Soil resistance pushes back on the share bottom, creating a couple that pushes forward on the top link in compression. (C is correct)
4. In floating/free-link mode, implement gauge wheels control the working depth. (D is correct)
All four statements A, B, C, D are correct.