Explore topic-wise MCQs in Mass Transfer.

This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Mass Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.

The dimension of diffusion coefficient is given by

A. M L T -2
B. L 2 T -1
C. L T -1
D. M L -2 T
Answer» C. L T -1
Discussion
2.

What is the molecular weight of Sulphur-dioxide?

A. 84
B. 74
C. 64
D. 54
Answer» D. 54
Discussion
3.

Estimate the diffusion coefficient of carbon monoxide through air in which the mole fractions of each constituents areO 2 = 0.18N 2 = 0.72CO = 0.10The gas mixture is at 300 K and 2 atmosphere total pressure. The diffusivity values areD CO = 18.5 * 10 -6 m2/s at 273 K, 1 atmD CN = 19.2 * 10 -6 m2/s at 288 K, 1 atmThe subscripts C is carbon monoxide, O is oxygen and N is nitrogen

A. 10.29 * 10 -6 m2/s
B. 18.5 * 10 -6 m2/s
C. 17.5 * 10 -6 m2/s
D. 13.5 * 10 -6 m2/s
Answer» B. 18.5 * 10 -6 m2/s
Discussion
4.

Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure.For ammonia,Molecular weight = 17Molecular volume = 25.81 cm3/gm moleFor air,Molecular weight = 29

A. 0.4880 cm2/s
B. 0.3880 cm2/s
C. 0.2880 cm2/s
D. 0.1880 cm2/s
Answer» E.
Discussion
5.

What is the unit of diffusion coefficient?

A. m2
B. s
C. m2 s
D. m2/s
Answer» E.
Discussion
6.

Figure shows equimolal diffusion between species B and C. Identify the correct molar diffusion rate

A. N b = m c/M b
B. N b = m b/M b
C. N c = m b/M b
D. N c = m b/M c
Answer» C. N c = m b/M b
Discussion
7.

Fick’s law is given by the formula

A. N b = – D b c d C b/d x
B. N b = – 2 D b c d C b/d x
C. N b = – 3 D b c d C b/d x
D. N b = – 4 D b c d C b/d x
Answer» B. N b = – 2 D b c d C b/d x
Discussion
8.

WHAT_IS_THE_MOLECULAR_WEIGHT_OF_SULPHUR-DIOXIDE??$

A. 84
B. 74
C. 64
D. 54
Answer» D. 54
Discussion
9.

The_dimension_of_diffusion_coefficient_is_given_by$

A. M L T <sup>-2</sup>
B. L <sup>2 </sup>T <sup>-1</sup>
C. L T <sup>-1</sup>
D. M L <sup>-2 </sup>T
Answer» C. L T <sup>-1</sup>
Discussion
10.

What is the value of Schmidt number for hydrogen?

A. 0.23
B. 0.22
C. 0.21
D. 0.21
Answer» C. 0.21
Discussion
11.

What is the molecular volume of air at normal boiling point?

A. 29.89 cm<sup>3</sup>/gm mole
B. 39.89 cm<sup>3</sup>/gm mole
C. 49.89 cm<sup>3</sup>/gm mole
D. 59.89 cm<sup>3</sup>/gm mole
Answer» B. 39.89 cm<sup>3</sup>/gm mole
Discussion
12.

What is the molecular weight of ammonia?

A. 31
B. 53
C. 29
D. 39
Answer» D. 39
Discussion
13.

Fick’s law is given by the formula

A. N <sub>b </sub>= – D <sub>b c </sub>d C <sub>b</sub>/d x
B. N <sub>b </sub>= – 2 D <sub>b c </sub>d C <sub>b</sub>/d x
C. N <sub>b </sub>= – 3 D <sub>b c </sub>d C <sub>b</sub>/d x
D. N <sub>b </sub>= – 4 D <sub>b c </sub>d C <sub>b</sub>/d x
Answer» B. N <sub>b </sub>= ‚Äö√Ñ√∂‚àö√ë‚àö¬® 2 D <sub>b c </sub>d C <sub>b</sub>/d x
Discussion