Question

Match the LIST-I with LIST-II:

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

Hint:

For column design: NTU tells you how "hard" the job is, and HTU (Height of Transfer Unit) tells you how "good" your equipment is. Total Height = $HTU \times NTU$.

Answer 1

The Correct Option is A

Concept: Separation processes involve various correlations and dimensionless parameters to design and evaluate the performance of columns (distillation, absorption, etc.).

Step 1: Match A (Gilliland).
The Gilliland correlation (A) is an empirical relationship used in distillation to find the relation between the actual number of stages and the reflux ratio (IV), based on minimum stages and minimum reflux.

Step 2: Match B (Relative Volatility).
Relative volatility ($\alpha$) (B) is a measure of the ease of separation (III). A value of $\alpha = 1$ means no separation is possible, while higher values indicate easier separation.

Step 3: Match C (Steady State).
Steady state diffusion (C) implies that the flux is constant and there is no accumulation of the diffusing species with time (I) within the system.

Step 4: Match D (NTU).
In mass transfer equipment, the Number of Transfer Units (NTU) (D) represents the measurement of the difficulty of the separation (II). A higher NTU indicates a more difficult separation requiring a taller column.