Question

Match List-I with List-II.

List-I	List-II
A. Hammer mill	I. Particle size classification
B. Centrifuge	II. Mixing of powders and solids
C. Sieve	III. Size reduction of solids
D. Ribbon blender	IV. Separation of solids and liquids

Choose the correct answer from the options given below:

• A. A-III, B-IV, C-I, D-II
• B. A-II, B-IV, C-I, D-III
• C. A-III, B-I, C-IV, D-II
• D. A-II, B-III, C-I, D-IV

Hint:

Hammer mill → grinding, Sieve → classification, Centrifuge → separation.

Answer 1

The Correct Option is A

Concept: Different unit operations in food engineering are designed for specific mechanical processes like size reduction, separation, and mixing.

Step 1: Hammer mill (A).

• Used for grinding materials into smaller particles
• Operates mainly by impact force So, A $\rightarrow$ III (Size reduction).

Step 2: Centrifuge (B).

• Separates components based on density differences
• Commonly used to separate solids from liquids So, B $\rightarrow$ IV.

Step 3: Sieve (C).

• Used to classify particles based on size So, C $\rightarrow$ I.

Step 4: Ribbon blender (D).

• Used for uniform mixing of powders and granular solids So, D $\rightarrow$ II.

Step 5: Final matching. \[ A-III,\; B-IV,\; C-I,\; D-II \] Final Conclusion:
Option (1) is correct.