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 19 of 21

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Q181.
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
Q182.
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 – d/ (4 h² + d)^1/2

b.

1 – d/ (4 h² + d ²)^1/2

c.

1 – d/ (4 h + d²)^1/2

d.

1 – d/ (h² + d²)^1/2

Discuss
Answer: (b).1 – d/ (4 h² + d ²)^1/2
Q183.
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
Q184.
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
Q185.
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 α

b.

A cos α

c.

2A cos α

d.

2A cos α

Discuss
Answer: (b).A cos α
Q186.
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 α E b

d.

4 denotes the quantity (1 – α) E b

Discuss
Answer: (a).1 denotes the radiant energy E emitted by the non-black surface impinges on the black surface
Q187.
The solid angle is defined by a region by the rays of a sphere, and is measured as

a.

An/r²

b.

An/r

c.

An/r³

d.

An/r⁴

Discuss
Answer: (a).An/r²
Q188.
The plane angle is defined by a region by the rays of a circle, and is measured as

a.

3 L/ r

b.

2 L/ r

c.

L/ r

d.

4 L / r

Discuss
Answer: (c).L/ r
Q189.
When the incident surface is a sphere, the projection of surface normal to the line of propagation is the silhouette disk of the sphere which is a circle of the diameter of

a.

Parabola

b.

Sphere

c.

Triangle

d.

Hyperbola

Discuss
Answer: (b).Sphere
Q190.
If I n denotes the normal intensity and I α represents the intensity at angle α, then

a.

I α = 2 I n cos α

b.

I α = 3 I n cos α

c.

I α = 4 I n cos α

d.

I α = I n cos α

Discuss
Answer: (d).I α = I n cos α
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