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Test: Emissivity - Chemical Engineering MCQ


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10 Questions MCQ Test - Test: Emissivity

Test: Emissivity for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Test: Emissivity questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Emissivity MCQs are made for Chemical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Emissivity below.
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Test: Emissivity - Question 1

 What is the value of emissivity for polished aluminum?

Detailed Solution for Test: Emissivity - Question 1

Explanation: The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation.

Test: Emissivity - Question 2

Which one is having highest emissivity?

Detailed Solution for Test: Emissivity - Question 2

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.

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Test: Emissivity - Question 3

 What is the value of emissivity for polished copper?

Detailed Solution for Test: Emissivity - Question 3

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

Test: Emissivity - Question 4

What is the value of emissivity for tarnished copper?

Detailed Solution for Test: Emissivity - Question 4

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

Test: Emissivity - Question 5

Which one is having lowest emissivity?

Detailed Solution for Test: Emissivity - Question 5

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.

Test: Emissivity - Question 6

 What is the value of emissivity for dull stainless steel?

Detailed Solution for Test: Emissivity - Question 6

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

Test: Emissivity - Question 7

 What is the value of emissivity for white marble?

Detailed Solution for Test: Emissivity - Question 7

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

Test: Emissivity - Question 8

Which one is having highest emissivity?

Detailed Solution for Test: Emissivity - Question 8

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.

Test: Emissivity - Question 9

What is the value of emissivity for asphalt?

Detailed Solution for Test: Emissivity - Question 9

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

Test: Emissivity - Question 10

Which one is having lowest emissivity?

Detailed Solution for Test: Emissivity - Question 10

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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