All Courses
Get the App Signup / Login
Sign in Open App
Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Heat Transfer  >  Test: Absorptivity - Mechanical Engineering MCQ

Test: Absorptivity - Mechanical Engineering MCQ


Test Description

10 Questions MCQ Test Heat Transfer - Test: Absorptivity

Test: Absorptivity for Mechanical Engineering 2024 is part of Heat Transfer preparation. The Test: Absorptivity questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Absorptivity MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Absorptivity below.
Solutions of Test: Absorptivity questions in English are available as part of our Heat Transfer for Mechanical Engineering & Test: Absorptivity solutions in Hindi for Heat Transfer course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Absorptivity | 10 questions in 10 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Heat Transfer for Mechanical Engineering Exam | Download free PDF with solutions
Test: Absorptivity - Question 1
Save

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

Detailed Solution for Test: Absorptivity - Question 1

Rate os transmission = (0.5455) (640)/3 = 116.37 W/m2.

Test: Absorptivity - Question 2
Save

The absorptivity of a surface depends upon
(i) Direction of reflected radiation
(ii) Temperature of the surface
(iii) Composition
Identify the correct statements

Detailed Solution for Test: Absorptivity - Question 2

It depend upon the direction of incident radiation. Absorptivity is the fraction of total energy absorbed by the body.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Absorptivity - Question 3
Save

What is the absorptivity of gray body?

Detailed Solution for Test: Absorptivity - Question 3

Gray body absorbs a certain fixed percentage of impinging radiations.

Test: Absorptivity - Question 4
Save

A body that reflects all the incident thermal radiations is called a
Detailed Solution for Test: Absorptivity - Question 4

In this case reflection is regular. For such bodies reflectivity is unity and transmissivity is equal to zero.

Test: Absorptivity - Question 5
Save

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 absorption
Detailed Solution for Test: Absorptivity - Question 5

Rate of absorption = (0.5455) (640) = 349.12 W/m2.

Test: Absorptivity - Question 6
Save

Let 220 W/m2 of radiant energy is absorbed by a convex surface, 90 W/m2 is reflected and 40 W/m2 is transmitted through it. What is the value of absorptivity?
Detailed Solution for Test: Absorptivity - Question 6

It is the ratio of incident energy flow to that of absorbed radiations. Absorptivity = 220/(220 + 90 + 40) = 0.62.

Test: Absorptivity - Question 7
Save

For a grey surface
Detailed Solution for Test: Absorptivity - Question 7

Emissivity is constant only for grey surfaces because grey surface radiates much more than any of the other surface.

Test: Absorptivity - Question 8
Save

Which quantity can be neglected for gases?
Detailed Solution for Test: Absorptivity - Question 8

Gases are known to reflect very little of the radiation incident on their surface.

Test: Absorptivity - Question 9
Save

Absorptivity of a body is equal to its emissivity
Detailed Solution for Test: Absorptivity - Question 9

In most case absorptivity of a body is equal to its emissivity under thermal equilibrium conditions.

Test: Absorptivity - Question 10
Save

Electromagnetic waves strikes a hot body maintained at 900 degree Celsius which has a reflectivity of 0.66 and a transmissivity of 0.022. Let the absorbed flux be 60 W/m2. Determine the rate of incident flux
Detailed Solution for Test: Absorptivity - Question 10

Absorptivity + Reflectivity + Transmissivity = 1. So, incident flux = 60/0.318 = 188.67 W/m2.

57 videos|77 docs|86 tests
Join Course
Information about Test: Absorptivity Page
In this test you can find the Exam questions for Test: Absorptivity solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Absorptivity, EduRev gives you an ample number of Online tests for practice

Top Courses for Mechanical Engineering

57 videos|77 docs|86 tests
Join Course
Download as PDF

Top Courses for Mechanical Engineering

Important Questions for Absorptivity

Find all the important questions for Absorptivity at EduRev.Get fully prepared for Absorptivity with EduRev's comprehensive question bank and test resources. Our platform offers a diverse range of question papers covering various topics within the Absorptivity syllabus. Whether you need to review specific subjects or assess your overall readiness, EduRev has you covered. The questions are designed to challenge you and help you gain confidence in tackling the actual exam. Maximize your chances of success by utilizing EduRev's extensive collection of Absorptivity resources.

Absorptivity MCQs with Answers

Prepare for the Absorptivity within the Mechanical Engineering exam with comprehensive MCQs and answers at EduRev. Our platform offers a wide range of practice papers, question papers, and mock tests to familiarize you with the exam pattern and syllabus. Access the best books, study materials, and notes curated by toppers to enhance your preparation. Stay updated with the exam date and receive expert preparation tips and paper analysis. Visit EduRev's official website today and access a wealth of videos and coaching resources to excel in your exam.

Online Tests for Absorptivity Heat Transfer

Practice with a wide array of question papers that follow the exam pattern and syllabus. Our platform offers a user-friendly interface, allowing you to track your progress and identify areas for improvement. Access detailed solutions and explanations for each test to enhance your understanding of concepts. With EduRev's Online Tests, you can build confidence, boost your performance, and ace Absorptivity with ease. Join thousands of successful students who have benefited from our trusted online resources.
© EduRev
Education Revolution
Follow Us
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup