Question

In a separation process, efficiency of a screen can be improved by:
A. Using multiple screens one above the other
B. Using screen knockers
C. Uniformly feeding the material over full width of the screen
D. Using lower percentage open area of screen
E. Setting high degree of inclination
Choose the correct answer from the options given below:

• A. E, D Only
• B. A, B Only
• C. B, C Only
• D. B Only

Hint:

Screen efficiency improves with:
- Uniform feeding
- Prevention of blinding
- Proper inclination

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Screening is a separation process based on particle size.
Various factors affect screen efficiency.

Step 2: Key Formula or Approach:
No specific formula.
Need to know the factors that improve screen efficiency.

Step 3: Detailed Explanation:
Screen knockers prevent blinding and improve efficiency.
Uniform feeding over full width ensures maximum use of screen area.
Multiple screens may or may not improve efficiency.
Lower open area reduces capacity.
High inclination reduces residence time.
Thus, B and C are correct.

Step 4: Final Answer:
The correct statements are B and C.
Hence, the correct option is (C).