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Test: Spectral & Spatial Energy Distribution


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10 Questions MCQ Test Heat Transfer | Test: Spectral & Spatial Energy Distribution

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

The distribution of radiant energy is non uniform with respect to

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 1

It should be non-uniform with respect to both wavelength and direction.

Test: Spectral & Spatial Energy Distribution - Question 2

“Spatial distribution is also known as directional distribution”. Choose the correct option

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 2

Spatial or directional both are same.

Test: Spectral & Spatial Energy Distribution - Question 3

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 absorptivity for the surface material

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 3

Absorptivity = 250/350 = 0.714.

Test: Spectral & Spatial Energy Distribution - Question 4

Thermal radiation strikes a surface which has a reflectivity of 0.55 and transmissivity of 0.032. A quantity known as flux is found out to be 95 W/m 2. Determine the rate of incident flux.

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 4

Incident flux = 95/1 – 0.032 – 0.55 = 227.27 W/m2.

Test: Spectral & Spatial Energy Distribution - Question 5

What is the wavelength for visible light?

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 5

This is the maximum and minimum wavelength for visible light.

Test: Spectral & Spatial Energy Distribution - Question 6

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 absorption

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 6

Rate of absorption = 0.5455 * 800 = 436.40 W/m2.

Test: Spectral & Spatial Energy Distribution - Question 7

A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at the rate of 2 W. If heat transfer coefficient on both surfaces of the plate is stated to be 87.5 W/m 2 K, workout the reflectivity of the plate

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 7

Heat loss by convection from both sides of the plates = 2 h A d t = 1.1 W. Energy lost by reflection = 2.0 – 1.1 = 0.9 W.

Test: Spectral & Spatial Energy Distribution - Question 8

On clear night there is radiation from earth’s surface to the space. On such a night, the water particles on the plant leaves radiate to the sky whose temperature may be taken as 200 K. The water particles receive heat by convection from the surrounding air, the convection heat transfer coefficient has a value of 30 W/m2 K. If the water should not freeze, make calculations for the air temperature

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 8

Heat radiated to sky = Heat received by convection. So, temperature of air = 224.22/30 + 273 = 280.474 K.

Test: Spectral & Spatial Energy Distribution - Question 9

“Isothermal furnaces, with small apertures, approximate a black body and are frequently used to calibrate heat flux gauges”. Chose the correct answer

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 9

A small hole leading into a cavity thus acts very nearly as a black body.

Test: Spectral & Spatial Energy Distribution - Question 10

A surface element emits radiation in all directions, the intensity of radiation is however same in different directions. Choose the correct answer

Detailed Solution for Test: Spectral & Spatial Energy Distribution - Question 10

It must be different in different directions.

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