Thermo chemical conversion Technology

• 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

• Design Frequencies for Soil Conservation Structures:
• Earth dams having natural spillways $\to$ (II) 25 - 50 years: Built for permanent gully control and flood prevention where failure could cause moderate damage.
• Stock water dams $\to$ (I) 25 years: Designed to retain runoff for livestock drinking water with emergency spillways rated for 25-year storms.
• Terrace outlets and vegetated waterways $\to$ (IV) 10 years: Standard grassed waterways and terrace channels are designed for a 10-year recurrence interval storm without scouring.
• Field diversions $\to$ (III) 15 years: Diversion ridges/ditches carrying runoff away from gullies or fields use a 15-year design frequency.
• Matching Result: (A) - (II), (B) - (I), (C) - (IV), (D) - (III) (Option 4).

Correct option: (4) (A) - (II), (B) - (1), (C) - (V), (D) - (tll)

• Concept of Linear Reservoir in Hydrology:
• In catchment hydrology and linear flood routing (Nash and Clark models), a linear reservoir is a conceptual reservoir in which the storage ($S$) is directly proportional to the outflow rate ($Q$):

where $K$ is the storage constant (lag time).

• Conclusion: Storage is directly proportional to Outflow (Option 2).

Correct option: (2) Outflow

• Most Economical (Efficient) Open Channel Section:
• Statement (I): A channel section is most economical when maximum discharge is obtained for a given cost of construction. $\implies$ Correct.
• channel section is hydraulically most efficient/economical when it conveys maximum discharge ($Q$) for a given cross-sectional area and excavation volume (which corresponds to minimum wetted perimeter $P$).
• Statement (II): Discharge is maximum when the flow velocity is minimum. $\implies$ Incorrect.
• By continuity equation $Q = A \cdot V$, for a given cross-sectional area $A$, discharge is maximum when flow velocity $V$ is maximum (not minimum).
• Conclusion: Statement (I) is correct but Statement (II) is incorrect (Option 3).