Test: Wien’s Displacement Law

# Test: Wien’s Displacement Law

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## 10 Questions MCQ Test Heat Transfer | Test: Wien’s Displacement Law

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

### The relationship (Wavelength) MAX T = constant, between the temperature of a black body and the wavelength at which maximum value of monochromatic emissive power occurs is known as

Detailed Solution for Test: Wien’s Displacement Law - Question 1

This is the Wien’s law. From the spectral distribution of black body emissive power, it is apparent that the wavelength associated with maximum rate of emission depends up on the absolute temperature of the radiating surface.

Test: Wien’s Displacement Law - Question 2

### A body at 500 K cools by radiating heat to ambient atmosphere maintained at 300 K. When the body has cooled to 400 K, the cooling rate as a percentage of original rate is about

Detailed Solution for Test: Wien’s Displacement Law - Question 2

Q2/Q1 = (400)4 – (300)4/ (500)4 – (300)4 = 0.32.

Test: Wien’s Displacement Law - Question 3

### Two spheres A and B of same material have radius 1 m and 4 m, and temperatures 4000 K and 2000 K respectively. Then the energy radiated by sphere A is

Detailed Solution for Test: Wien’s Displacement Law - Question 3

E A/E B = (1)2 (4000)4/ (4)2 (2000)4 = 1.

Test: Wien’s Displacement Law - Question 4

A small body has a total emissive power of 4.5 kW/m2. Determine its surface temperature of maximum emission

Detailed Solution for Test: Wien’s Displacement Law - Question 4

E = σ T4. So, T = 530.77 K.

Test: Wien’s Displacement Law - Question 5

A small black body has a total emissive power of 4.5 k W/m2. In which range of the spectrum does this wavelength fall?

Detailed Solution for Test: Wien’s Displacement Law - Question 5

(Wavelength) T = 2.8908 * 10-3. This must be the wavelength of infrared region.

Test: Wien’s Displacement Law - Question 6

The sun emits maximum radiation of 0.52 micron meter. Assuming the sun to be a black body, Calculate the surface temperature of the sun

Detailed Solution for Test: Wien’s Displacement Law - Question 6

T = 2.8908 * 10 -3/0.52 * 10 -6 = 5573 K.

Test: Wien’s Displacement Law - Question 7

Consider the previous problem, determine the maximum monochromatic emissive power of the sun’s surface

Detailed Solution for Test: Wien’s Displacement Law - Question 7

(E) MAX = 1.285 * 10-5T5 = 6.908 * 1013 W/m2.

Test: Wien’s Displacement Law - Question 8

A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the wavelength at which emission is maximum

Detailed Solution for Test: Wien’s Displacement Law - Question 8

(Wavelength) T = 2.8908 * 10 -3. So, wavelength = 1.449 * 10 -6 m.

Test: Wien’s Displacement Law - Question 9

Four identical pieces of copper painted with different colors of paints were heated to the same temperature and then left in the environment to cool. Which of the following paint will give fast cooling?

Detailed Solution for Test: Wien’s Displacement Law - Question 9

The emissivity of black paint is highest i.e. unity. Consequently, the emitted radiant energy will be maximum when painted black.

Test: Wien’s Displacement Law - Question 10

A surface for which emissivity is constant at all temperatures and throughout the entire range of wavelength is called

Detailed Solution for Test: Wien’s Displacement Law - Question 10

Foe grey surface, emissivity is constant. Grey surface radiates much more because of constant wavelength throughout its entire surface.

## Heat Transfer

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## Heat Transfer

58 videos|70 docs|85 tests