Questions and answers for exam Preparation

MCQs

Total Questions : 115 | Page 11 of 12 pages

Question 101. Which among the following is always true for mass transfer to occur?

Difference in concentration
Difference in Pressure
Difference in temperature
Difference in chemical potential

Discuss Question

Answer: Option D. -> Difference in chemical potential
Answer: (d).Difference in chemical potential

Question 102. 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?

Discuss Question

Answer: Option A. -> 0.3
Answer: (a).0.3

Question 103. A gas mixture containing 21% O₂ and 79% N₂ flows through a pipe of circular cross-section of diameter 2cm at atmospheric pressure. The velocity of O₂ is 0.04m/s and N₂ is 0.035m/s.
What will be the value of mass average velocity (m/s)?

0.981
0.891
0.985
0.857

Discuss Question

Answer: Option A. -> 0.981
Answer: (a).0.981

Question 104. A gas mixture containing 21% O₂ and 79% N₂ flows through a pipe of circular cross-section of diameter 2cm at atmospheric pressure. The velocity of O₂ is 0.04m/s and N₂ is 0.035m/s.
What is the value of molar average velocity (m/s) of the mixture?

0.036
0.035
0.034
0.033

Discuss Question

Answer: Option A. -> 0.036
Answer: (a).0.036

Question 105. A gas mixture containing 21% O₂ and 79% N₂ flows through a pipe of circular cross-section of diameter 2cm at atmospheric pressure. The velocity of O₂ is 0.04m/s and N₂ is 0.035m/s.
What is the value of Volume average velocity?

0.036
0.035
0.034
0.033

Discuss Question

Answer: Option A. -> 0.036
Answer: (a).0.036

Question 106. 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.

0.015
15
1.015
1015

Discuss Question

Answer: Option D. -> 1015
Answer: (d).1015

Question 107. 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.

0.31
2.2
1.82
6.45

Discuss Question

Answer: Option C. -> 1.82
Answer: (c).1.82

Question 108. Fick’s law is given by the formula

N b = – D b c d C b/d x
N b = – 2 D b c d C b/d x
N b = – 3 D b c d C b/d x
N b = – 4 D b c d C b/d x

Discuss Question

Answer: Option A. -> N b = – D b c d C b/d x
Answer: (a).N b = – D b c d C b/d x

Question 109. Under which of the following conditions mass average velocity and molar average velocity are equal?

In a very dilute solution
If molecular weights of all the species are equal
Always different
In dilute solutions as well as in solutions in which all components have same molecular weights

Discuss Question

Answer: Option D. -> In dilute solutions as well as in solutions in which all components have same molecular weights
Answer: (d).In dilute solutions as well as in solutions in which all components have same molecular weights

Question 110. 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. What will be the value of flux (mol/m².s) with respect to a stationary observer?