Question

Match List-I with List-II. 

List-I (Equipment)	List-II (Property)
(A) Hammer mill	(I) Grain shape
(B) Cyclone separator	(II) Impact
(C) Spiral separator	(III) Grain size
(D) Indented cylinder separator	(IV) Centrifugal force

Choose the correct answer from the options given below.

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
• (A) - (IV), (B) - (III), (C) - (I), (D) - (II)
• (A) - (II), (B) - (IV), (C) - (III), (D) - (I)

Hint:

To solve this quickly, associate the Hammer Mill with Impact (A - II) and the Cyclone Separator with Centrifugal force (B - IV). This immediately narrows down the options.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
This matching question tests your knowledge of industrial unit operations used in milling, cleaning, and sorting grains based on their mechanical and physical properties.

Step 2: Detailed Explanation:
- (A) Hammer mill: Operates on the principle of mechanical size reduction by high-speed Impact (II) between the moving hammers and the stationary material.
- (B) Cyclone separator: Uses a high-velocity vortex to separate dust and fine particles from gas streams using Centrifugal force (IV).
- (C) Spiral separator: Separates seeds based on Grain shape (I). Round grains roll down the spiral faster and fly over the edge, while flat or irregular seeds slide slowly and remain on the spiral.
- (D) Indented cylinder separator: Separates grain mixtures based on length, which is a dimension of Grain size (III). The small pockets (indents) lift shorter grains out of the mixture.

Step 3: Final Answer:
The matching pairs are (A)-(II), (B)-(IV), (C)-(I), and (D)-(III), corresponding to Option (B).