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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 – Emissivity

Posted on June 17, 2017 by Manish

This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Emissivity”.

1. What is the value of emissivity for polished aluminum?
a) 0.01
b) 0.02
c) 0.03
d) 0.04
View Answer

Answer: c
Explanation: The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation.
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2. Which one is having highest emissivity?
a) Tarnished copper
b) Polished aluminum
c) Aluminum foil
d) Polished copper
View Answer

Answer: a
Explanation: Emissivity of tarnished copper is 0.75 while that of polished aluminum, aluminum foil and polished copper are 0.03, 0.05 and 0.03 respectively.

3. What is the value of emissivity for polished copper?
a) 0.02
b) 0.03
c) 0.04
d) 0.05
View Answer

Answer: b
Explanation: This is the total hemispherical emissivity from the surfaces. It describes thermal radiation emitted near specific wavelength and at specific angles to surface.

4. What is the value of emissivity for tarnished copper?
a) 0.78
b) 0.77
c) 0.76
d) 0.75
View Answer

Answer: d
Explanation: This is optically thick material. The absorptivity at the wavelengths doesn’t depend on the thickness of the material.

5. Which one is having the lowest emissivity?
a) Polished stainless steel
b) White marble
c) Snow
d) Asphalt
View Answer

Answer: a
Explanation: Emissivity of polished stainless steel is 0.60 while that of white marble, snow and asphalt are 0.95, 0.97 and 0.90 respectively.
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6. What is the value of emissivity for dull stainless steel?
a) 0.24
b) 0.23
c) 0.22
d) 0.21
View Answer

Answer: d
Explanation: It is transparent with low emissivity coatings. It emits less thermal radiation than an ordinary window.

7. What is the value of emissivity for white marble?
a) 0.96
b) 0.95
c) 0.94
d) 0.93
View Answer

Answer: b
Explanation: It is based on evacuated glass tube collectors. Sunlight is absorbed by a selective surface.

8. Which one is having highest emissivity?
a) Red brick
b) Concrete
c) Black paint
d) Dull stainless steel
View Answer

Answer: c
Explanation: Emissivity of black paint is 0.97 while that of red brick, concrete and dull stainless steel are 0.93, 0.88 and 0.21 respectively.

9. What is the value of emissivity for asphalt?
a) 0.90
b) 0.80
c) 0.70
d) 0.60
View Answer

Answer: a
Explanation: It is an ordinary black surface that absorbs sunlight efficiently but emits thermal radiation copiously.

10. Which one is having the lowest emissivity?
a) Snow
b) White marble
c) Concrete
d) Polished stainless steel
View Answer

Answer: d
Explanation: Emissivity of polished stainless steel is 0.60 while that of snow, white marble and concrete are 0.97, 0.95 and 0.88 respectively.
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Sanfoundry Global Education & Learning Series – Mass Transfer.

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

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Mass Transfer Questions and Answers – Schmidt Number »
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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and 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 & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below:
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