Mass Transfer MCQs

Question 1

A binary mixture of benzene and cyclohexane is separated by

Accepted Answer

Extractive distillation

Answer

Flash vaporisation

Answer

Solvent extraction

Answer

Ordinary distillation

Question 2

Rose oil is extracted from rose leaves using __________ distillation.

Accepted Answer

Steam

Answer

High pressure

Answer

Low pressure

Answer

Extractive

Question 3

If f is defined as above, then which of the following applies to a feed at dew point?

Accepted Answer

F = 1

Answer

F < 1

Answer

F > 1

Answer

0 < f < 1

Question 4

Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.

Accepted Answer

Tray

Answer

Rotary

Answer

Freeze

Answer

None of these

Question 5

Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

Accepted Answer

K ∝ $$\sqrt {	ext{D}} $$

Answer

K ∝ D

Answer

K ∝ D 1.5

Answer

K ∝ D 2

Question 6

The operating line for an absorber is curved, when plotted in terms of

Accepted Answer

Partial pressure

Answer

Mole fractions

Answer

Mole ratios

Answer

Mass fractions

Question 7

The Hatta number is important in

Accepted Answer

Gas absorption with chemical reaction

Answer

Multicomponent distillation

Answer

Binary distillation

Answer

Gas absorption without chemical reaction

Question 8

Batch tray dryers suffers from the disadvantage of

Accepted Answer

High labour cost & low heat economy

Answer

High maintenance cost

Answer

Non-uniform & low production rate

Answer

All of the above

Question 9

At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.

Accepted Answer

Total

Answer

Operating

Answer

Minimum

Answer

Maximum permissible