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GATE 2023 || Heat Transfer || Quiz 50

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Question 1

For a non-black surface, absorptivity is 0.37 & reflectivity 0.29. Then the emissivity of the surface when the body is in thermal equilibrium with surrounding is

Question 2

The shields used between two surface is usually reduce the heat transfer by radiation between the two surfaces by

Question 3

Two infinitely large parallel plates 1 and 2 are held at temperatures 800 K and 500 K respectively and placed at a distance 50 mm apart in vaccum. A third large infinite flat radiation shield is introduced in between the plates 1 and 2. Consider emissivity of all the plates are equal. The ratio of the steady state radiative heat flux with and without the shield is

Question 4

Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If D₁ and D₂ are the diameters of the inner and outer tubes respectively, then the view factor F₂₂ is given by

Question 5

For Grey body, mono chromatic emissivity is _________.

Question 6

Calculate the total emissive power of a black body whose temperature is 573 ºC and Area is 5m²____.

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ESE & GATE ME Heat Transfer

Jun 24ESE & GATE ME