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AE-JE (ME) || Heat Transfer Quiz - 3

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Question 1

The value of reflectivity for gases and white bodies respectively are.

Question 2

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 3

Black body is the body which should be

1) Black in colour

2) Ideal emitter

3) Perfect absorber

4) Perfect reflector

5) Diffusive in nature

Question 4

A flat plate has one side surface area 5 m². The area shown to observer at angle 60° to horizontal to surface is.

Question 5

Consider the graph below.

The ratio of T₁ by T₂ at point A is __________. [T₂ > T₁]

Question 6

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 7

For an opaque plane surface the irradiation radiosity and emissive power are respectively 25, 15, and 12 W/m². What is the emissivity of the surface?

Question 8

What will be the view factor F₂₁ for the geometry as shown in the figure below (sphere within a cube)?

Question 9

Two radiating surfaces A₁ = 10 m² and A₂ = 5 m² have the shape factor F_1–2 = 0.2; the shape factor F_{2 – 1} will be __________.

Question 10

If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of

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AE & JE Exams Mechanical Engineering

Dec 27AE & JE Exams