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Chemical Engineering Exam  >  Chemical Engineering Tests  >  Test: Heat Exchange Between Black Bodies - Chemical Engineering MCQ

Test: Heat Exchange Between Black Bodies - Chemical Engineering MCQ


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10 Questions MCQ Test - Test: Heat Exchange Between Black Bodies

Test: Heat Exchange Between Black Bodies for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Test: Heat Exchange Between Black Bodies questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Heat Exchange Between Black Bodies MCQs are made for Chemical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Heat Exchange Between Black Bodies below.
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Test: Heat Exchange Between Black Bodies - Question 1
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Engineering problems of practical interest are involved with heat exchange between two or more surfaces, and this exchange is strongly dependent upon
(i) Radiative properties
(ii) Temperature levels
(iii) Surface geometrics
Identify the correct statements

Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 1

For black surface, it is necessary to determine what portion of radiation emitted by one will be intercepted by the other.

Test: Heat Exchange Between Black Bodies - Question 2
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The fraction of the radiative energy that is diffused from one surface element and strikes the other surface directly with no intervening reflections is called
(i) Radiation shape factor
(ii) Geometrical factor
(iii) Configuration factor
Choose the correct answer

Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 2

Radiation shape factor, geometrical factor and configuration factor are all same.

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Test: Heat Exchange Between Black Bodies - Question 3
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The interchange factor is also known as

Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 3

The interchange factor is also known as equivalent emissivity.

Test: Heat Exchange Between Black Bodies - Question 4
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For the same type of shapes, the value of radiation shape factor will be higher when
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 4

Obviously the value of radiation shape factor will be higher when surfaces are larger and held closer.

Test: Heat Exchange Between Black Bodies - Question 5
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A thin shield of emissivity E 3 on both sides is placed between two infinite parallel plates of emissivities E 1 and E 2 and temperatures T 1 and T 2. If E 1 = E 2 = E 3, then the fraction radiant energy transfer without shield takes the value
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 5

The ratio of radiant energy transfer without and with shield is given by
(1/E 1 + 1/E 2 – 1)/ [(1/E 1 + 1/E 3 – 1) + (1/E 3 + 1/E 2 – 1)].

Test: Heat Exchange Between Black Bodies - Question 6
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The grey body shape factor for radiant heat exchange between a small body (emissivity = 0.4) in a large enclosure (emissivity = 0.5) is
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 6

(F) 12 = 1/ (1 – E 1 + 1 + 0).

Test: Heat Exchange Between Black Bodies - Question 7
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Two long parallel surfaces, each of emissivity 0.7 are at different temperatures and accordingly have radiation exchange between them. It is desired to reduce 75% of this radiant heat transfer by inserting thin parallel shields of equal emissivity 0.7 on both sides. What should be the number of shields?
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 7

Without shields/with shield = 1/N + 1.

Test: Heat Exchange Between Black Bodies - Question 8
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An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers are
F 11 = 0.1
F 12 = 0.4
F 13 = 0.25
The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 8

F 11 + F 12 + F 13 + F 14 = 1.

Test: Heat Exchange Between Black Bodies - Question 9
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The value of shape factor depends on how many factors?
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 9

Geometry and orientation.

Test: Heat Exchange Between Black Bodies - Question 10
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Find the shape factor F12 for the arrangement shown in the figure. The areas A1 and A2 are perpendicular but do not share the common edge
Detailed Solution for Test: Heat Exchange Between Black Bodies - Question 10

A 5 = A 1 + A 3 and A 6 = A 2 + A 4. The sequence of the solution is, A 5 F 56 = A 1 F 16 + A 3 F 36.

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