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Mass Transfer Multiple Choice Questions | MCQs | Quiz

Mass Transfer Interview Questions and Answers
Practice Mass Transfer questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Concentration & Fluxes
•   Concentration & Velocitiy
•   Fick's Law - 1
•   Fick's Law - 2
•   Convective Mass Transfer
•   Emissivity
•   Schmidt Number
•   Celsius Diffusivity
•   Density
•   Transport Correlations
•   Melting Point
•   Mass Transfer Interphase
•   Cocurrent Basics
•   Counter Current
•   Cascade Stages
•   Gas Liquid Equipments
•   Humidification Operation
•   Vapour Gas Mixture
•   Absorption Line Concept
•   Gas Absorption Principle
•   Absortion Tower Design
•   Vapour Liquid Equilibria
•   Idealities Concept Deviation
•   Flash Vaporization
•   Differential Distillation
•   Distillation Column
•   Thiele Method Design
•   Ponchon & Savarit Method
•   Azeotropic Mixtures
•   Reflux Ratio
•   Reflux Ratio Cost Variance
•   Reboiler & Condenser
•   Flash Vaporization Line
•   Distillation Types
•   Extraction Liquid Equilibria
•   Unit Operations
•   Single Stage Operations
•   Ternary Equilibrium Diagram
•   Extraction Equipments
•   Drying Rate
•   Drying Time Calculation
•   Drying Moisture Concept
•   Drying Operation
•   Leaching Operation
•   Solids Molecular Diffusion
•   Liquids Molecular Diffusion
•   Gas Molecular Diffusion
•   Free Convection Correlation
•   Multistage Operations
•   Multicomponent Diffusion
•   Variable Diffusion
•   Binary Gas Mixture

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Mass Transfer Questions and Answers – Operating Line Concept for Absorption

Posted on June 17, 2017 by Manish

This set of Mass Transfer Interview Questions & Answers focuses on “Operating Line Concept for Absorption”.

1. Spray tower is a _______ process.
a) Co-current
b) Counter current
c) Continuous
d) Batch
View Answer

Answer: b
Explanation: Here, the gas is passed through the bottom and the liquid is sprayed at the top.
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2. Find the rate of non-diffusing solute, if the mole fraction of the gas phase is 0.65 and the diffusing rate is 70 moles/hr.
a) 2 4.5 moles/hr
b) 200 moles/hr
c) 18.18 moles/hr
d) 37.7 moles/hr
View Answer

Answer: a
Explanation: Gs= G(1-y)
=70 x(1-0.65)
=24.5 moles/hr.

3. In an absorber, lower denser materials are sent through the bottom and the higher denser materials are sent through top
a) True
b) False
View Answer

Answer: a
Explanation: For reducing the pumping cost and to create sufficient pressure drop.

4. Stripper= (1/X)
Find X?
a) Condenser
b) Reboiler
c) Absorber
d) Sprayer
View Answer

Answer: c
Explanation: Stripper is liquid to gas transfer but absorber is gas to liquid transfer.

5. Find the representation
mass-transfer-interview-questions-answers-experienced-q5
Where, Y- gas phase concentration in mole ratio
X-liquid phase concentration in mole ratio
a) Stripper
b) Absorber
c) Condenser
d) Semi-Stripper
View Answer

Answer: a
Explanation: For stripper, the solute gets transfer from liquid to gas so the operating line is below the equilibrium line.
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6. Find the slope of the operating line
mass-transfer-interview-questions-answers-experienced-q6
Here, the concentrations are represented in mole ratio. The value of (Y1-Y2)/(X1-X2) =2. Find the slope of the operating line.
a) 1
b) 2
c) 3
d) Infinity
View Answer

Answer: b
Explanation: For a counter current process, Y1- Y2 = Ls/Gs(X1-X2)
Ls/Gs= slope of the operating line = 2.

7. Have a look on the below diagram
mass-transfer-interview-questions-answers-experienced-q7
Here, DE and DP are the operating line. Also Y and X are the concentrations in mole ratio for gas and liquid phase.
It’s clearly a representation of an absorber. For the operating line DE minimum liquid is required
a) True
b) False
View Answer

Answer: b
Explanation: DP line requires minimum liquid because the composition is increased to X2.

8. If the operating line touches the equilibrium line, the separation is possible in an absorber.
a) True
b) False
View Answer

Answer: b
Explanation: At that point, the slope of operating line will be equals to the slope of the equilibrium line. So the Absorption factor becomes equal to one, the separation is not possible.

9. For the Absorber design, the plotting with mole ratio helps to find the
a) Slope of operating line
b) Slope of equilibrium curve
c) Minimum number of trays
d) Maximum number of trays
View Answer

Answer: a
Explanation: The plot with mole fraction will give an operating line as a curve; it will be very difficult to find the slope of the operating line. Therefore the use of mole ratio plot will give us a liner operating line.

10. Given for an absorber, the minimum non diffusing liquid flow rate is 20 moles/hr and the non diffusing gas flow rate is 30 moles/hr. As the actual liquid flow rate is 2.5 times the minimum. Find the slope of the operating line.
a) 1.67
b) 3.75
c) 2.67
d) 4.25
View Answer

Answer: a
Explanation: Ls= 2.5 (Ls min)
Slope= (2.5 x 20)/30 =1.67.
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Sanfoundry Global Education & Learning Series – Mass Transfer.

To practice all areas of Mass Transfer for interviews, here is complete set of 1000+ Multiple Choice Questions and Answers

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Deep Dive @ Sanfoundry:

  1. Distillation Design Questions and Answers
  2. Fluidization Engineering Questions and Answers
  3. Separation Processes Questions and Answers
  4. Chemical Engineering Questions and Answers
  5. Chemical Process Calculation Questions and Answers
  6. Heat Transfer Questions and Answers
  7. Operating System Questions and Answers
  8. Mass Transfer Questions and Answers
  9. Mass Transfer Questions and Answers – Molecular Diffusion in Gas
  10. Mass Transfer Questions and Answers – Design of Fractionator with Mc-cabe Thiele Method
Manish Bhojasia
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Facebook | Twitter

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