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Test: Stefan Boltzmann Law


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10 Questions MCQ Test Heat Transfer | Test: Stefan Boltzmann Law

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

The Stefan-Boltzmann constant has units of

Detailed Solution for Test: Stefan Boltzmann Law - Question 1

According to Stefan-Boltzmann law, q = α A T4.

Test: Stefan Boltzmann Law - Question 2

According to Stefan-Boltzmann law of thermal radiation

Detailed Solution for Test: Stefan Boltzmann Law - Question 2

α is Stefan-Boltzmann constant whose value is 5.67 * 10 -8 W/m2 K4.

Test: Stefan Boltzmann Law - Question 3

Calculate the radiant flux density from a black surface at 400 degree Celsius?

Detailed Solution for Test: Stefan Boltzmann Law - Question 3

E = σ T4 = 5.67 * 10 –8 (400 + 273)4 = 11631.7 W/m2.

Test: Stefan Boltzmann Law - Question 4

If the emitted radiant energy is to be doubled, to what temperature surface of black body needs to be raised? Take radiant flux density as 11631.7 W/m2.

Detailed Solution for Test: Stefan Boltzmann Law - Question 4

2(11631.7) = 5.67 * 10 –8 T 4.

Test: Stefan Boltzmann Law - Question 5

A furnace having inside temperature of 2250 has a glass circular viewing of 6 cm diameter. If the transmissivity of glass is 0.08, make calculations for the heat loss from the glass window due to radiation

Detailed Solution for Test: Stefan Boltzmann Law - Question 5

Q = σ A T4 (t) = 328.53 W.

Test: Stefan Boltzmann Law - Question 6

The value of radiation coefficient or the Stefan-Boltzmann constant is

Detailed Solution for Test: Stefan Boltzmann Law - Question 6

q = α A T4.

Test: Stefan Boltzmann Law - Question 7

Measurements were made of the monochromatic absorptivity and monochromatic hemispherical irradiation incident on an opaque surface, and the variation of these parameters with wavelength may be approximated by the result shown below. Determine the total hemispherical absorptivity

Detailed Solution for Test: Stefan Boltzmann Law - Question 7

Incident flux = 800(8 – 2) – 4800 W/m2. Absorptivity = 3200/4800 = 0.667.

Test: Stefan Boltzmann Law - Question 8

What is the wavelength band for Ultraviolet rays?

Detailed Solution for Test: Stefan Boltzmann Law - Question 8

This is the maximum and minimum wavelength for Ultraviolet rays.

Test: Stefan Boltzmann Law - Question 9

A black body of total area 0.045 m2 is completely enclosed in a space bounded by 5 cm thick walls. The walls have a surface area 0.5 m 2 and thermal conductivity 1.07 W/ m K. If the inner surface of the enveloping wall is to be maintained at 215 degree Celsius and the outer wall surface at 30 degree Celsius, calculate the temperature of the black body

Detailed Solution for Test: Stefan Boltzmann Law - Question 9

Q= σ A (T b– Tw4), Q c = k A d t/δ = 1979.5 W. So temperature of black body is 955.9 K.

Test: Stefan Boltzmann Law - Question 10

What is the wavelength band for solar radiation?

Detailed Solution for Test: Stefan Boltzmann Law - Question 10

This is the maximum and minimum wavelength for solar radiation.

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