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 14 of 21

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Q131.
When Stefan-Boltzmann law is applied to a black body, it takes the form
Discuss
Answer: (d).E = ฯƒ Tโด
Q132.
When the emissivity of non-black surface is constant at all temperatures and throughout the entire range of wavelength, the surface is called
Discuss
Answer: (a).Gray body
Q133.
The emissivity of the gray surface may be expressed as
Discuss
Answer: (c).ฯƒ / ฯƒb
Q134.
If a black body at 1000 K and a gray body at 1250 K emit the same amount of radiation, what should be the emissivity of the gray body?
Discuss
Answer: (b).0.4096
Q135.
The radiant heat transfer from a plate of 2.5 cm² area at 1250 K to a very cold enclosure is 5.0 W. Determine the emissivity of the plate at this temperature
Discuss
Answer: (d).0.144
Q136.
A 100 W light bulb has a tungsten filament (emissivity = 0.30) which is required to operate at 2780 K. If the bulb is completely evacuated, calculate the minimum surface area of the tungsten filament
Discuss
Answer: (a).0.98 * 10¯โด m²
Discuss
Answer: (d).Steradian and its maximum value is ฯ€
Q138.
A gray body (E = 0.8) emits the same amount of heat as a black body at 1075 K. Find out the required temperature of the gray body
Discuss
Answer: (b).1136.72 K
Q139.
The heat energy absorbed by a known area in a fixed time is determined with the help of an instrument called
Discuss
Answer: (b).Pyrheliometer
Q140.
The value of solar constant varies between
Discuss
Answer: (d).1335 and 1815 W/m²