Explore topic-wise MCQs in Mass Transfer.

This section includes 17 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 mass flow rate of a component in a mixture in X-direction is 2kg/s. The area vector at a particular cross-section is (1.1, 3.2, 5.4) cm2. Calculate the value of flux (kg/cm2.s) through the cross-section.

A. 0.31
B. 2.2
C. 1.82
D. 6.45
Answer» D. 6.45
Discussion
2.

Under which of the following conditions mass average velocity and molar average velocity are equal?

A. In a very dilute solution
B. If molecular weights of all the species are equal
C. Always different
D. In dilute solutions as well as in solutions in which all components have same molecular weights
Answer» E.
Discussion
3.

In the previous question what will be the value of flux (mol/m2.s) with respect to a stationary observer?

A. 0.015
B. 15
C. 1.015
D. 1015
Answer» C. 1.015
Discussion
4.

The velocity of various components of mixture(21% A, 78% B and 1% C) are: Velocity is in the form: v=xi+yj+zk Velocity of component A= (0.1, 0, 0) Velocity of component B= (0, 0.1, 0) Velocity of component B= (0, 0, 0.1) Calculate the value of average molar velocity?

A. (0.021, 0.078, 0.01)
B. (0.1, 0.1, 0.1)
C. (0, 0 ,0)
D. (0.079, 0.021, 0.01)View Answer
Answer» B. (0.1, 0.1, 0.1)
Discussion
5.

In a gas mixture if molecular weights of all the species are equal than which one will be more, Mass average velocity or Molar average velocity?

A. Mass average velocity
B. Molar average velocity
C. Both will have the same value
D. Nothing definite can be said
Answer» D. Nothing definite can be said
Discussion
6.

IN_A_GAS_MIXTURE_IF_MOLECULAR_WEIGHTS_OF_ALL_THE_SPECIES_ARE_EQUAL_THAN_WHICH_ONE_WILL_BE_MORE,_MASS_AVERAGE_VELOCITY_OR_MOLAR_AVERAGE_VELOCITY??$

A. Mass average velocity
B. Molar average velocity
C. Both will have the same value
D. Nothing definite can be said
Answer» B. Molar average velocity
Discussion
7.

1, 0, 0)$

A.
B.
C.
Answer» B.
Discussion
8.

A molecule in a mixture moves with a velocity of 0.03m/s in (+x) direction. The concentration of the particle is 0.5 mol/liter. A observer is running in (-x) direction with a velocity of 2m/s. calculate the value of molar flux (mol/m2.s) relative to the observer.

A. 0.015
B. 15
C. 1.015
D. 1015
Answer» D. 1015
Discussion
9.

Which among the following can be the unit of Flux?

A. Kg*m-2*s-1
B. Kg*m2*s-1
C. Kg*m2*s1
D. Kg*m*s2
Answer» E.
Discussion
10.

For the calculation of Mass average velocity, which velocity of the molecule is used?

A. Instantaneous Velocity
B. Mean Velocity
C. Instantaneous Velocity as well as Mean Velocity
D. Bulk velocity of the mixture
Answer» C. Instantaneous Velocity as well as Mean Velocity
Discussion
11.

Calculate the value of mass average velocity in the previous question?

A. (0.0235, 0.0764, 0.00007)
B. (0.021, 0.078, 0.01)
C. (0.1, 0.1 0.1)
D. (0.079, 0.021, 0.01)
Answer» E.
Discussion
12.

What is the value of Volume average velocity?

A. 0.036
B. 0.035
C. 0.034
D. 0.033
Answer» B. 0.035
Discussion
13.

What will be the value of mass average velocity (m/s)?

A. 0.981
B. 0.891
C. 0.985
D. 0.857
Answer» D. 0.857
Discussion
14.

What is the value of molar average velocity (m/s) of the mixture?

A. 0.036
B. 0.035
C. 0.034
D. 0.033
Answer» B. 0.035
Discussion
15.

A solution contains 0.3 moles of solute A, 0.2 moles of B and 0.5 moles of C. What will be the mole fraction of A in the mixture?

A. 0.3
B. 0.2
C. 0.5
D. 1
Answer» B. 0.2
Discussion
16.

Which among the following is always true for mass transfer to occur?

A. Difference in concentration
B. Difference in Pressure
C. Difference in temperature
D. Difference in chemical potential
Answer» E.
Discussion
17.

In which of the following conditions mass transfer will occur spontaneously? C and z is concentration and distance respectively.

A. dC/dz>0
B. dC/dz<0
C. dC/dz=0
D. None of the Mentioned
Answer» C. dC/dz=0
Discussion