• Pneumatic Tyre Aspect Ratio Classifications:
• Aspect Ratio ($AR$) of a tractor tyre is the ratio of section height ($H$) to section width ($W$) expressed as a percentage or fraction ($AR = H / W$):
• Low-section (low-profile) tyres: $AR \lt 0.75$
• Standard agricultural tractor tyres: $AR = 0.80 - 0.85$
• High-molded (tall-profile / high-aspect) agricultural tyres: Have tall, narrow carcass sections designed for high ground clearance and crop row spacing where $AR \ge 1.00$ (1.00 or higher).
• Conclusion: 1.00 or higher (Option 4).

Correct option: (4) 00 or higher

• Filter Frequency Response Characteristics:
• Band-pass filter passes signals within a designated continuous frequency band between a lower cutoff frequency ($f_1$) and an upper cutoff frequency ($f_2$), while heavily attenuating frequencies below $f_1$ and above $f_2$.
• Other Filters:
• Low-pass filter: Passes all frequencies from 0 to cutoff frequency $f_c$.
• High-pass filter: Passes frequencies above cutoff frequency $f_c$.
• Notch (Band-stop) filter: Rejects a narrow band while passing all others.
• Conclusion: Band pass filter (Option 3).

Correct option: (3) Band pass filter

• Tractor Operator Seat Ergonomics and Ride Vibration:
• Ride vibration in agricultural tractors consists of pitch, roll, and vertical bounce vibrations induced by terrain roughness.
• The Centre of Gravity (CG) of the tractor experiences the minimum angular rotational acceleration and pitch motions.
• Positioning the operator's seat as near to the centre of gravity as practical isolates the driver from severe pitching and rolling whiplash amplitudes.
• Conclusion: Near to the centre of gravity (Option 2).

Correct option: (2) Near to the centre of gravity

• Operational Characteristics of Screw Conveyors:
• screw conveyor consists of a helical auger revolving inside a stationary U-shaped or cylindrical trough.
• Due to continuous rubbing friction between the material, auger flights, and trough wall:
• Power consumption is relatively high compared to belt conveyors or bucket elevators ($2-3$ times higher power).
• Continuous abrasive contact makes screw flights and bearings more susceptible to wear.
• Conclusion: Require relatively high power and are more susceptible to wear (Option 2).

Correct option: (2) Require relatively high power and are more susceptible to wear