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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Heat Transfer  >  Test: Shape Factor - Mechanical Engineering MCQ

Test: Shape Factor - Mechanical Engineering MCQ


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11 Questions MCQ Test Heat Transfer - Test: Shape Factor

Test: Shape Factor for Mechanical Engineering 2024 is part of Heat Transfer preparation. The Test: Shape Factor questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Shape Factor MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Shape Factor below.
Solutions of Test: Shape Factor questions in English are available as part of our Heat Transfer for Mechanical Engineering & Test: Shape Factor solutions in Hindi for Heat Transfer course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Shape Factor | 11 questions in 10 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Heat Transfer for Mechanical Engineering Exam | Download free PDF with solutions
Test: Shape Factor - Question 1
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Which of the followings is a wrong statement?

The shape factor is equal to one

Detailed Solution for Test: Shape Factor - Question 1

For a flat or convex surface, the shape factor with respect to itself is zero. This aspect stems from the fact that for any part of flat or convex surface, one cannot see any other part of the same surface.

Test: Shape Factor - Question 2
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Establish a relation for the shape factor of cylindrical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate

Detailed Solution for Test: Shape Factor - Question 2

F 11 + F 12 = 1 and F 21 + F 22 = 1. But F 22 = 0, so F 11 = 1 – A 2 / A 1.

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Test: Shape Factor - Question 3
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The reciprocity theorem states that

Where symbols have their usual meanings

Detailed Solution for Test: Shape Factor - Question 3

It indicates the net radiation exchange can be calculated by computing one way configuration factor from either surface to the other.

Test: Shape Factor - Question 4
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Two radiating surface A 1 = 6 m2 and A 2 = 4 m2 have shape factor F 12 = 0.1. Then the shape factor F 21 will be
Detailed Solution for Test: Shape Factor - Question 4

A 1 F 12 = A 2 F 21.

Test: Shape Factor - Question 5
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What is the value of shape factor for two infinite parallel surfaces separated by a distance x?
Detailed Solution for Test: Shape Factor - Question 5

All the radiation emitted by one falls on the other so shape factor is unity.

Test: Shape Factor - Question 6
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What is the shape factor of a sphere of diameter d inside a cubical box of length l = d?
Detailed Solution for Test: Shape Factor - Question 6

F 11 + F 12 = 1 or F 12 = 1. So, F 21 = π/6.

Test: Shape Factor - Question 7
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What is the shape factor of hemispherical surface closed by a plane surface of diameter d?
Detailed Solution for Test: Shape Factor - Question 7

F 11 + F 12 = 1 and F 21 = 1. Therefore, F 11 = 0.5.

Test: Shape Factor - Question 8
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What is the shape factor of hemispherical surface closed by a plane surface of diameter d?
Detailed Solution for Test: Shape Factor - Question 8

F 11 + F 12 = 1 and F 21 = 1. Therefore, F 11 = 0.5.

Test: Shape Factor - Question 9
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Establish a relation for shape factor for a conical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate
Detailed Solution for Test: Shape Factor - Question 9

F 11 = 1 – A 2 / A 1 = 1 – 2 sin α = 1 – d/ (4 h 2 + d 2) ½.

Test: Shape Factor - Question 10
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What is the shape factor for a hemispherical bowl with respect to itself of diameter d? The cavity is closed on its outer surface with a flat plate
Detailed Solution for Test: Shape Factor - Question 10

F 11 = 1 – A 2 / A 1 = 0.5.

Test: Shape Factor - Question 11
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Consider a system of concentric spheres of radius r 1 and r 2 (r 2 is greater than r 1). If r 1 = 5 cm, determine the radius r 2 if it is desired to have the value of shape factor F 21 equal to 0.6
Detailed Solution for Test: Shape Factor - Question 11

From reciprocity theorem, A 1 F 12 = A 2 F 21.

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Important Questions for Shape Factor

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Shape Factor MCQs with Answers

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