• Threshing Cylinders for Fine Straw (Bhusa) Production:
• In Indian agriculture, wheat straw (bhusa) is heavily valued as dairy cattle fodder and must be bruised and crushed into fine pieces.
• The Hammer mill type (or syndicated beater type with serrated concave) threshing cylinder uses high-speed swinging/fixed hammers that pulverize and bruise wheat straw into exceptionally fine fodder.
• Rasp-bar and spike-tooth cylinders thresh grain effectively but produce coarser straw pieces.
• Conclusion: Hammer mill type (Option 2).

Correct option: (2) Hammer mill type

• Agricultural Storage and Thermal Processing:
• Janssen's Theory $\to$ (IV) Storage Structure: Foundational theory for calculating lateral and vertical pressure loads in deep grain silos/bins.
• CAP (Cover and Plinth) $\to$ (II) Bag Storage: Outdoor grain storage method in India where bagged grain stacks are placed on raised plinths and covered with polythene tarpaulins.
• Newton's Law of Cooling $\to$ (I) Convection: States that heat loss rate from a solid body is proportional to temperature difference with the surrounding fluid.
• Sensible Heating $\to$ (III) Constant Humidity: Heating air across psychrometric lines at constant absolute/specific humidity without adding or removing moisture.
• Matching Result: (A) - (IV), (B) - (II), (C) - (I), (D) - (III) (Option 4).

Correct option: (4) (A) - (IV), (B) - (I), (C) - (), (D) - (ttl)

• Equilibrium Moisture Content (EMC) Isotherm Models:
• The equilibrium moisture content of agricultural grains is predicted by empirical and theoretical sorption isotherm equations:
• Kelvin equation: Based on capillary condensation in pores.
• Harkins-Jura equation: Based on multimolecular adsorption potential.
• Henderson equation (Modified Henderson equation): Most widely used empirical model for grain sorption isotherms.
• (D) Janssen equation: Calculates grain pressure in deep storage bins, not EMC.
• Conclusion: (A), (B) and (C) only (Option 3).

Correct option: (3) (A), (B) and (C) only,

• Grain Storage Silo Classifications (Deep vs. Shallow Bins):
• Statement (I): In a deep bin, plane of rupture strikes the opposite side of structure before it meets the grain surface. $\implies$ True.
• In deep grain bins, the internal plane of rupture of the granular mass intersects the opposite vertical wall before reaching the top free surface of the grain.
• Statement (II): A grain bin can be classified as deep bin when the depth of grain is greater than the equivalent diameter. $\implies$ True.
• By Janssen and Airy criteria, a bin is classified as a deep bin when grain depth $H \gt D \tan(45^\circ + \phi/2) \approx D$.
• Conclusion: Both Statement (I) and Statement (II) are true (Option 1).

Correct option: (1) Both Statement (I) and Statement (II) are true.