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.
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
Q52.
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
Q53.
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
Q54.
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
Q55.
Which one is true regarding gases?

a.

Reflectivity is unity

b.

Absorptivity is zero

c.

Reflectivity is zero

d.

Transmissivity is zero

Discuss
Answer: (c).Reflectivity is zero
Q56.
Thin glass plate is an example of

a.

Transparent body

b.

Opaque body

c.

Black body

d.

White body

Discuss
Answer: (a).Transparent body
Q57.
Radiant energy with an intensity of 800 W/m² strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of reflection

a.

518.20 W/m²

b.

418.20 W/m²

c.

318.20 W/m²

d.

218.20 W/m²

Discuss
Answer: (d).218.20 W/m²
Q58.
Which one is true for opaque body?

a.

Transmissivity is zero

b.

Reflectivity is zero

c.

Absorptivity is zero

d.

Reflectivity is unity

Discuss
Answer: (a).Transmissivity is zero
Q59.
Energy strikes a vertical hemispherical plate with an intensity of 640 W/m². The absorptivity is thrice the transmissivity and twice the reflectivity. Determine the rate of transmission

a.

236.74 W/m²

b.

116.37 W/m²

c.

187.87 W/m²

d.

456.09 W/m²

Discuss
Answer: (b).116.37 W/m²
Q60.
The absorptivity of a surface depends upon

(i) Direction of reflected radiation
(ii) Temperature of the surface
(iii) Composition

Identify the correct statements

a.

1, 2 and 3

b.

1 and 3

c.

2 only

d.

2 and 3

Discuss
Answer: (d).2 and 3
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