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Test: Transmissivity


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10 Questions MCQ Test Heat Transfer | Test: Transmissivity

Test: Transmissivity for Chemical Engineering 2022 is part of Heat Transfer preparation. The Test: Transmissivity questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Transmissivity MCQs are made for Chemical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Transmissivity below.
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Test: Transmissivity - Question 1

The value of transmissivity may vary from

Detailed Solution for Test: Transmissivity - Question 1

This is very small quantity. The response of the body to incident radiations is, however, completely independent of and unaffected by the simultaneous emission from the body.

Test: Transmissivity - Question 2

Of the radiant energy 350W/m2 incident upon a surface 250W/m2 is absorbed, 60W/m2 is reflected and the remainder is transmitted through the surface. Workout the value for reflectivity for the surface material

Detailed Solution for Test: Transmissivity - Question 2

Reflectivity = fraction of total energy reflected by the body = 60/350 = 0.171.

Test: Transmissivity - Question 3

“Transmissivity can also be defined as ratio of transmitted radiation to that of incident energy flow”. True or false

Detailed Solution for Test: Transmissivity - Question 3

It is the ratio of incident energy flow to that of transmitted radiations.

Test: Transmissivity - Question 4

A cavity with a small hole will always behave as a

Detailed Solution for Test: Transmissivity - Question 4

No radiation passing in and out will have any effect upon the equilibrium of radiation inside the cavity.

Test: Transmissivity - Question 5

What is the wavelength band of gamma rays?

Detailed Solution for Test: Transmissivity - Question 5

This is the maximum and minimum wavelength for gamma rays.

Test: Transmissivity - Question 6

Transmissivity is defined as

Detailed Solution for Test: Transmissivity - Question 6

It is fraction of total energy transmitted by the body.

Test: Transmissivity - Question 7

A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation

Detailed Solution for Test: Transmissivity - Question 7

The total heat exchange can be expressed as, Q = U A d t where U is the overall coefficient of heat transfer.

Test: Transmissivity - Question 8

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 transmission

Detailed Solution for Test: Transmissivity - Question 8

Rate of transmission = TQ= 145.47 W/m2.

Test: Transmissivity - Question 9

With respect to incident radiation, transmissivity varies with

Detailed Solution for Test: Transmissivity - Question 9

For transparent body, transmissivity is equal to unity.

Test: Transmissivity - Question 10

A body through which all the incident radiations passes, is called

Detailed Solution for Test: Transmissivity - Question 10

For transparent body, transmissivity is unity.

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