Explore topic-wise MCQs in Bioprocess Engineering.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

The diffusion of gas is ____________

A. Linear process
B. Slow process
C. Spontaneous process
D. Non- spontaneous process
Answer» D. Non- spontaneous process
Discussion
2.

What is the unit of diffusion flux “J” in the Fick’s law equation?

A. mol m−2 s−1
B. mol m2 s−1
C. mol m2 s1
D. mol m−2 s1
Answer» B. mol m2 s−1
Discussion
3.

In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system.For equimolar counter current diffusion:

A. 2.898×10-5 m2/sec
B. 3.898×10-5 m2/sec
C. 2.989×10-5 m2/sec
D. 3.989×10-5 m2/sec
Answer» C. 2.989×10-5 m2/sec
Discussion
4.

Refer to Q6, and calculate the partial pressure at a point 0.02 m apart from point 1.

A. 20.63 kPa
B. 28.33 kPa
C. 28.63 kPa
D. 20.33 kPa
Answer» C. 28.63 kPa
Discussion
5.

Methane diffuses at steady state through a tube containing helium. At point 1 the partial pressure of methane is pA1 = 55 kPa and at point 2, 0.03 m apart PA2 = 15 KPa. The total pressure is 101.32 kPa, and the temperature is 298 K. At this pressure and temperature, the value of diffusivity is 6.75 * 10–5 m2/sec.Calculate the flux of CH4 at steady state for equimolar counter diffusion.For steady state equimolar counter diffusion, molar flux is given by:

A. 3.666×10-5 kmol/m2 sec
B. 3.866×10-5 kmol/m2 sec
C. 3.833×10-5 kmol/m2 sec
D. 3.633×10-5 kmol/m2 sec
Answer» E.
Discussion
6.

Refer to Q4, and calculate the diffusivity of O2 in a gas mixture.

A. 1.539×10-5 m2/sec
B. 1.639×10-5 m2/sec
C. 1.530×10-5 m2/sec
D. 1.630×10-5 m2/sec
Answer» B. 1.639×10-5 m2/sec
Discussion
7.

Determine the diffusivity of CO2 in a gas mixture having the composition:CO2: 28.5 %, O2: 15%, N2: 56.5%,The gas mixture is at 273 k and 1.2 * 105 Pa. The binary diffusivity values are given as: (at 273 K)D12 P = 1.874 m2 Pa/secD13 P = 1.945 m2 Pa/secD23 P = 1.834 m2 Pa/sec

A. 1.51×10-5 m2/sec
B. 1.50×10-5 m2/sec
C. 1.61×10-5 m2/sec
D. 1.60×10-5 m2/sec
Answer» D. 1.60×10-5 m2/sec
Discussion
8.

What is Fick’s law applicable to?

A. Momentum transfer
B. Heat transfer
C. Mass transfer
D. Velocity transfer
Answer» D. Velocity transfer
Discussion
9.

In the following equation, what does y signifies?

A. Dispersion
B. Displacement
C. Diffusion
D. Distance
Answer» E.
Discussion
10.

898√ó10-5_m2/sec$#

A. 3.898√ó10-5 m<sup>2</sup>/sec
B. 2.989√ó10-5 m<sup>2</sup>/sec
C. 3.989√ó10-5 m<sup>2</sup>/sec
Answer» D.
Discussion
11.

Refer to Q6, and calculate the partial pressure at a point 0.02 m apart from point 1?

A. 20.63 kPa
B. 28.33 kPa
C. 28.63 kPa
D. 20.33 kPa
Answer» C. 28.63 kPa
Discussion
12.

Refer to Q4, and calculate the diffusivity of O2 in a gas mixture.

A. 1.539√ó10<sup>-5</sup> m<sup>2</sup>/sec
B. 1.639√ó10<sup>-5</sup> m<sup>2</sup>/sec
C. 1.530√ó10<sup>-5</sup> m<sup>2</sup>/sec
D. 1.630√ó10<sup>-5</sup> m<sup>2</sup>/sec
Answer» B. 1.639‚Äö√†√∂‚àö‚â•10<sup>-5</sup> m<sup>2</sup>/sec
Discussion
13.

What is Fick’s law applicable to?$

A. Momentum transfer
B. Heat transfer
C. Mass transfer
D. Velocity transfer
Answer» D. Velocity transfer
Discussion
14.

Molecular diffusion is which type of motion?

A. Thermal motion
B. Linear motion
C. Non- turbulent motion
D. Rectilinear motion
Answer» B. Linear motion
Discussion