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Test: Gaseous Radiations


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10 Questions MCQ Test Heat Transfer | Test: Gaseous Radiations

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

Which of the following have a continuous spectrum?

Detailed Solution for Test: Gaseous Radiations - Question 1

They emit and absorb radiant energy of all wavelength.

Test: Gaseous Radiations - Question 2

Which of the following is/are known as selective absorbers?

Detailed Solution for Test: Gaseous Radiations - Question 2

They emit and absorb radiant energy in definite parts of the spectrum called bands.

Test: Gaseous Radiations - Question 3

Which layers participated in the process of thermal radiation through solids and liquids?

Detailed Solution for Test: Gaseous Radiations - Question 3

Gases possess a much small radiating power and all their volumes participate in the radiation.

Test: Gaseous Radiations - Question 4

Some of the gases have low emissive power and absorptivity. They are considered practically diathermanous. Which of the following option is true?

Detailed Solution for Test: Gaseous Radiations - Question 4

Helium is monoatomic gas and is extremely inert to thermal radiation.

Test: Gaseous Radiations - Question 5

Consider an enclosure formed by three surfaces having the following values of shape factors, emissivities and temperatures 

 

Surface 1 i.e. curved cylindrical has an emissivity 0.75 and temperature 800 K
Surface 2 i.e. closing disc has an emissivity 0.8 and temperature 700 K
Surface 3 i.e. closing disc has an emissivity 0.8 and temperature 700 K
The closing flat discs are 25 mm in diameter and they have interspacing distance equal to 100 mm. If the shape factor between these two identical discs is 0.05, calculate the net rate of radiant heat flow from the curve surface to each of the closing end surface

Detailed Solution for Test: Gaseous Radiations - Question 5

 F 21 + F 23 + 1 and A = 0.00785 m2, A= 0.000491 m2. Then from reciprocity theorem, F 12 = 0.0594. Q12 = F 12 σ (T 1– T 2 4) = 3.561 W.

Test: Gaseous Radiations - Question 6

Consider a beam of monochromatic radiation at wavelength λ that enters a layer of absorbing gas. As the beam passes through the gas layer, its intensity

Detailed Solution for Test: Gaseous Radiations - Question 6

The decrease is given by d I λ X = – K λ λ X d x.

Test: Gaseous Radiations - Question 7

When a gas or vapor is in the process of oxidation and combustion, it is called as

Detailed Solution for Test: Gaseous Radiations - Question 7

It is known as flame.

Test: Gaseous Radiations - Question 8

The monochromatic absorption coefficient depends upon
(i) Temperature
(ii) Time
(iii) Pressure
(iv) Wavelength
Identify the correct option

Detailed Solution for Test: Gaseous Radiations - Question 8

It depends upon the state of gas and the wavelength.

Test: Gaseous Radiations - Question 9

Which one of the following is not extremely inert to thermal radiation?

Detailed Solution for Test: Gaseous Radiations - Question 9

Methane is a polyatomic gas.

Test: Gaseous Radiations - Question 10

Consider a beam of monochromatic radiation at wavelength λ that enters a layer of absorbing gas. As the beam passes through the gas layer, its intensity is given by

Detailed Solution for Test: Gaseous Radiations - Question 10

Its intensity gets reduced.

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