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 13 of 21

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Q121.
A small black body has a total emissive power of 4.5 k W/m². In which range of the spectrum does this wavelength fall?

a.

Thermal region

b.

Cosmic region

c.

Visible region

d.

Infrared region

Discuss
Answer: (d).Infrared region
Q122.
The sun emits maximum radiation of 0.52 micron meter. Assuming the sun to be a black body, Calculate the surface temperature of the sun

a.

2345 K

b.

5573 K

c.

9847 K

d.

6492 K

Discuss
Answer: (b).5573 K
Q123.
A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the wavelength at which emission is maximum

a.

1.449 * 10¯โถ m

b.

2.449 * 10¯โถ m

c.

3.449 * 10¯โถ m

d.

4.449 * 10¯โถ m

Discuss
Answer: (a).1.449 * 10¯โถ m
Q124.
Four identical pieces of copper painted with different colors of paints were heated to the same temperature and then left in the environment to cool. Which of the following paint will give fast cooling?

a.

White

b.

Rough

c.

Black

d.

Shining

Discuss
Answer: (c).Black
Q125.
A surface for which emissivity is constant at all temperatures and throughout the entire range of wavelength is called

a.

Opaque

b.

Grey

c.

Specular

d.

Diathermanous

Discuss
Answer: (b).Grey
Q126.
If radiant energy EB emitted by the black surface strikes the non-black surface. If non-black surface has absorptivity ฮฑ, it will absorb how much radiations?

a.

ฮฑ EB

b.

2 ฮฑ EB

c.

3 ฮฑ EB

d.

4 ฮฑ EB

Discuss
Answer: (a).ฮฑ EB
Q127.
If two surfaces are at the same temperature, then the conditions correspond to mobile thermal equilibrium for which the resultant interchange of heat is zero are

a.

3 E โ€“ ฮฑ EB = 0

b.

2 E โ€“ ฮฑ EB = 0

c.

E โ€“ ฮฑ EB = 0

d.

½ E โ€“ ฮฑ EB = 0

Discuss
Answer: (c).E โ€“ ฮฑ EB = 0
Q128.
Consider radiant heat exchange between two non-black parallel surfaces. The surface 1 emits radiant energy E 1 which strikes the surface 2. Identify the correct option

a.

The value of B is ฮฑ E1

b.

The value of C is (1 โ€“ ฮฑ1) E 1

c.

The value of D is (1 โ€“ ฮฑ1) (1 โ€“ ฮฑ2)² E 1

d.

The value of E is (1 โ€“ ฮฑ1)² (1 โ€“ ฮฑ2) E 1

Discuss
Answer: (c).The value of D is (1 โ€“ ฮฑ1) (1 โ€“ ฮฑ2)² E 1
Q129.
Two large parallel planes with emissivity 0.4 are maintained at different temperatures and exchange heat only by radiation. What percentage change in net radiative heat transfer would occur if two equally large radiation shields with surface emissivity 0.04 are introduced in parallel to the plates?

a.

65.1%

b.

75.1%

c.

85.1%

d.

95.1%

Discuss
Answer: (d).95.1%
Q130.
A blind cylindrical hole of 2 cm diameter and 3 cm length is drilled into a metal slab having emissivity 0.7. If the metal slab is maintained at 650 K, make calculations for the radiation heat escape from the hole

a.

7 W

b.

3 W

c.

1 W

d.

9 W

Discuss
Answer: (b).3 W
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