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.
A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at the rate of 2 W. If heat transfer coefficient on both surfaces of the plate is stated to be 87.5 W/m² K, workout the reflectivity of the plate

a.

0.35

b.

0.45

c.

0.55

d.

0.65

Discuss
Answer: (b).0.45
Q52.
On clear night there is radiation from earth’s surface to the space. On such a night, the water particles on the plant leaves radiate to the sky whose temperature may be taken as 200 K. The water particles receive heat by convection from the surrounding air, the convection heat transfer coefficient has a value of 30 W/m² K. If the water should not freeze, make calculations for the air temperature

a.

280.474 K

b.

345.645 K

c.

123.456 K

d.

874.387 K

Discuss
Answer: (a).280.474 K
Q53.
When a gas or vapor is in the process of oxidation and combustion, it is called as

a.

Oxidation

b.

Flame

c.

Reduction

d.

Combustion

Discuss
Answer: (b).Flame
Q54.
The monochromatic absorption coefficient depends upon

(i) Temperature

(ii) Time

(iii) Pressure

(iv) Wavelength

Identify the correct option

a.

1, 2 and 4

b.

2, 3 and 4

c.

1 and 2

d.

1, 3 and 4

Discuss
Answer: (d).1, 3 and 4
Q55.
Which one of the following is not extremely inert to thermal radiation?

a.

Orgon

b.

Oxygen

c.

Methane

d.

Nitrogen

Discuss
Answer: (c).Methane
Q56.
Consider a beam of monochromatic radiation at wavelength Ξ» that enters a layer of absorbing gas. As the beam passes through the gas layer, its intensity is given by

a.

d I Ξ» X = – K Ξ» I Ξ» X d x

b.

d I Ξ» X = – 2 K Ξ» I Ξ» X d x

c.

d I Ξ» X = – 3 K Ξ» I Ξ» X d x

d.

d I Ξ» X = – 4 K Ξ» I Ξ» X d x

Discuss
Answer: (a).d I Ξ» X = – K Ξ» I Ξ» X d x
Q57.
Which one is having highest value of fouling factor?

a.

Sea water

b.

Distilled water

c.

Liquid gasoline

d.

Clean river

Discuss
Answer: (c).Liquid gasoline
Q58.
What is the value of fouling factor for sea water?

a.

0.0001-0.0002 m² K/W

b.

0.0002-0.0003 m² K/W

c.

0.0003-0.0004 m² K/W

d.

0.0004-0.0005 m² K/W

Discuss
Answer: (a).0.0001-0.0002 m² K/W
Q59.
β€œIsothermal furnaces, with small apertures, approximate a black body and are frequently used to calibrate heat flux gauges”. Chose the correct answer

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q60.
β€œA surface element emits radiation in all directions, the intensity of radiation is however same in different directions. Choose the correct answer

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (b).False
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