# Mass Transfer Mcqs

This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Mass Transfer ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Mass Transfer comprehensively.

## 1. Diffusion is a process of

Movement of particles from higher concentration to lower concentration

Movement of particles through a semipermeable membrane

Rarefaction of particles

Accumulation of particles on a solid surface

M/s

M2/s

M3/s

Kmol/(m2-s)

0

1

?

B

0

1

?

D

?

1

?

2

## 6. The binary diffusivity in gases is dependent upon

The temperature

The pressure

The nature of components

All of the above

T

T1/2

T3/2

T2

## 8. The binary diffusivity in gases varies

Directly as the pressure

Inversely as the pressure

Inversely as the square root of pressure

Directly as the square root of pressure

10-1 cm2/sec

10-5 cm2/sec

105 cm2/sec

10-7 cm2/sec

10-5 cm2/sec

10-5 m2/sec

10-5 mm2/sec

10-5 ft2/sec

## 11. The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is linear

In the case of steady-state equimolal counter-diffusion

In the case of steady-state unimolal unidirectional diffusion

Both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion

A

## 12. The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is non-linear

In the case of steady-state equimolal counter-diffusion

In the case of steady-state unimolal unidirectional diffusion

Both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion

B

## 13. The diffusivity DAB for A diffusing in B is the same as the fiffusivity DBA for B diffusing in A for a binary mixture of

Ideal gases only

Real gases only

Both ideal and real gases

Real liquids only

Linear law

Hyperbolic law

Parabolic law

Exponential law

## 15. Select the wrong statement

Molecular diffusion in solids is much faster than molecular diffusion in gases and liquids

Molecular diffusion in solids is much slower than molecular diffusion in gases and liquids

The diffusion coefficient in a liquid is 10-4 to 10-5 times times the diffusion coefficient in a gas

Molecular diffusion in gases is much faster than molecular diffusion in liquids

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