Heat Radiation MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Heat Radiation, a fundamental topic in the field of Heat Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Heat Radiation MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Heat Radiation mcq questions that explore various aspects of Heat Radiation problems. Each MCQ is crafted to challenge your understanding of Heat Radiation principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Heat Radiation MCQs are your pathway to success in mastering this essential Heat Transfer topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Heat Radiation. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Heat Radiation knowledge to the test? Let's get started with our carefully curated MCQs!

Heat Radiation MCQs | Page 6 of 21

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Q51.
The reciprocity theorem states that (Where symbols have their usual meanings)

a.

F 12 = F 21

b.

A 1 F 12 = A 2 F 21

c.

A 1 F 21 = A 2 F 12

d.

A 2 F 21 = A 1 F 12

Discuss
Answer: (b).A 1 F 12 = A 2 F 21
Q52.
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

a.

0.12

b.

0.18

c.

0.15

d.

0.10

Discuss
Answer: (c).0.15
Q53.
What is the value of shape factor for two infinite parallel surfaces separated by a distance x?

a.

0

b.

1

c.

x

d.

Infinity

Discuss
Answer: (b).1
Q54.
What is the shape factor of a sphere of diameter d inside a cubical box of length l = d?

a.

ฯ€/6

b.

2 ฯ€/6

c.

ฯ€/3

d.

ฯ€/4

Discuss
Answer: (a).ฯ€/6
Q55.
What is the shape factor of hemispherical surface closed by a plane surface of diameter d?

a.

0

b.

1.5

c.

1

d.

0.5

Discuss
Answer: (d).0.5
Q56.
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

a.

1 โ€“ d/ (4 h² + d)^1/2

b.

1 โ€“ d/ (4 h² + d ²)^1/2

c.

1 โ€“ d/ (4 h + d²)^1/2

d.

1 โ€“ d/ (h² + d²)^1/2

Discuss
Answer: (b).1 โ€“ d/ (4 h² + d ²)^1/2
Q57.
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

a.

1.5

b.

1

c.

0.5

d.

2.5

Discuss
Answer: (c).0.5
Q58.
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

a.

6.45 cm

b.

7.45 cm

c.

8.45 cm

d.

9.45 cm

Discuss
Answer: (a).6.45 cm
Q59.
In the given diagram let r be the length of the line of propagation between the radiating and the incident surfaces. What is the value of solid angle W?

a.

A sin ฮฑ

b.

A cos ฮฑ

c.

2A cos ฮฑ

d.

2A cos ฮฑ

Discuss
Answer: (b).A cos ฮฑ
Q60.
Consider two surfaces, one absolutely black and the other non-black. These surfaces are arranged parallel to each other and so close that the radiation of one falls totally on the other. Choose the correct option

a.

1 denotes the radiant energy E emitted by the non-black surface impinges on the black surface

b.

1 denotes the radiant energy E emitted by the black surface impinges on the non-black surface

c.

2 and 3 denotes the quantity ฮฑ E b

d.

4 denotes the quantity (1 โ€“ ฮฑ) E b

Discuss
Answer: (a).1 denotes the radiant energy E emitted by the non-black surface impinges on the black surface
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