• Extended Surface (Fin) Geometries in Heat Exchangers:
• Fins expand convective heat transfer surface area ($q = h A \Delta T$):
• (I) Longitudinal fins: Rectangular profiles attached along planar furnace or heat exchanger walls.
• (II) Radial (annular) fins: Concentric circular discs around cylindrical evaporator/condenser pipes.
• (III) Conical pin fins (spines): Protruding tapered rods maximizing heat dissipation with minimum fin weight.
• All three are standard, mathematically valid fin geometries.
• Conclusion: (I), (II) and (III) (Option 1).

Correct option: (1) 0), () and (I!)

• Chronological Sequence of Evaporator Operations:
• In dairy and food engineering, the operational procedure for a falling film or forced circulation evaporator follows a rigorous thermodynamic sequence:

• Step 1: Preheating the feed solution: Raw liquid feed is preheated close to the boiling temperature using regenerate heat exchangers to conserve energy.
• Step 5: Heating the feed solution to its boiling point: The liquid is brought to its saturation boiling point within the evaporation chamber/calandria tubes.
• Step 2: Vaporization of the solvent from the feed solution: Latent heat of vaporization causes rapid water evaporation, concentrating the non-volatile milk solutes.
• Step 3: Condensation of the vaporized solvent to produce distillate: Separated water vapor passes to a condenser (or mechanical vapor recompressor, MVR) to produce condensate.
• Step 4: Removal of concentrated solution or residue: The concentrated product (condensed milk/dairy syrup) is continuously discharged through the bottom extraction pump.
  • Conclusion: The correct chronological sequence is 1 - 5 - 2 - 3 - 4 (Option 1).

Evaluating the Assertion and Reason concerning Buffalo and other species of milch animals:

The correct answer is Option 1: Both A and R are correct and R is the correct explanation of A.

• Evaporation of Heat-Sensitive Viscous Dairy Foods:
• Spinning Cone Evaporators (Centrifugal Thin-Film Evaporators): Use spinning, steam-heated conical surfaces (such as the Centri-Therm evaporator) rotating at high speeds ($1000-1500\text{ rpm}$).
• Centrifugal force spreads viscous dairy products into an ultra-thin liquid film (around $0.1\,\text{mm}$) across the heated cone.
• The residence time is exceptionally short ($1-2\text{ seconds}$) and evaporation occurs at low vacuum temperatures ($35^\circ\text{C}-45^\circ\text{C}$), preventing thermal degradation, foulant burning, or denaturation.
• Falling film and rising film evaporators suffer from poor flow and severe fouling with highly viscous products.
• Correct Option: Option 3 (Spinning cone evaporators).