Step 1: Understanding the Concept:
This question asks for the typical inflation pressure range for the front tires of a tractor. Tractor tires have different pressure requirements for front and rear wheels due to their different functions and load-bearing characteristics.
Step 2: Detailed Explanation:
1. Tractor Tire Functions:
- Rear tires are the main drive wheels. They are large and wide to provide high traction and support the heavy weight of the tractor and implements. They are typically operated at lower pressures (e.g., 0.8 to 1.5 kg/cm$^2$) to maximize the contact area (footprint) with the soil, which improves traction and reduces soil compaction.
- Front tires are typically smaller and are primarily for steering. They carry less of the total weight compared to the rear tires. To ensure good steering response and to handle the loads during turns and when using front-mounted equipment (like loaders), they are inflated to a higher pressure than the rear tires.
2. Typical Pressure Ranges:
- Rear tractor tires: 0.8 - 1.5 kg/cm$^2$ (approx. 12-22 psi).
- Front tractor tires: 1.5 - 2.5 kg/cm$^2$ (approx. 22-36 psi).
3. Analyzing the Options: The range given in option (D), 1.5 -- 2.5 kg/cm$^2$, aligns with the standard recommended inflation pressure for the front wheels of a general-purpose agricultural tractor. The other ranges are either too low (typical for rear tires) or do not cover the full common range.
Step 3: Final Answer:
The typical inflation pressure for the front tires of a tractor is in the range of 1.5 to 2.5 kg/cm$^2$. Therefore, option (D) is the correct answer.