Correct Answer - Option 1 : 0.9
Explanation:
Coefficient of traction:
In a tyre-surface system, the coefficient of friction is called the traction coefficient. The coefficient of traction is defined as the usable force for traction divided by the weight on the running gear.
Tractive effort (T.E.) = μ × W
Where, μ = coefficient of traction and W = load on the driving wheel
μ for crawler tractor = 0.90 and μ for rubber tyre = 0.60
Factors affecting coefficient of traction:
Traction between two surfaces depends on several factors:
- The material composition of each surface.
- Macroscopic and microscopic shape
- Normal force pressing contact surfaces together.
- Contaminants at the material boundary including lubricants and adhesives.
- The relative motion of tractive surfaces - a sliding object
- The direction of traction relative to some coordinate system - e.g., the available traction of a tire often differs between cornering, accelerating, and braking
