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SSC-JE ME || Heat Transfer Quiz - 2

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Question 1

Heat transfer through radiation takes place in form of:

Question 2

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

Question 3

For a glass plate transmissivity and reflectivity are specified as 0.76 and 0.08 respectively, the absorptivity of the glass plate is ___________.

Question 4

The total emissive power of a surface is 500 W/m² at a temperature T₁ and 1200 W/m² at a temperature T₂, where the temperatures are in Kelvin Assuming the emissivity of the surface to be constant, the ratio of the temperatures is

Question 5

The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 μm. If the peak wavelength of emitted radiation changes to 2.90 μm, then the temperature (in K) of the black body is___.

Question 6

The number of radiation shield screens in case of radiation heat transfer to reduce the radiation heat exchange by 80% is __________.

Question 7

A solid sphere 1 of radius ‘r’ is placed inside a hollow, closed hemispherical surface 2 of radius ‘4r’. The shape factor F_2-1 is

Question 8

The temperature of solid surface changes from 27 °C to 627 °C. The emissive power changes would then confirm to the ratio ________.

Question 9

Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the outer cylinder is R₀ and that of the inner cylinder is R_i. The radiation view factor of the outer cylinder onto itself is

Question 10

For a diffused body, emissivity is given as 0.5 and emissive power of the black body is given as 20W/m². Calculate the intensity of radiation of body? (in W/m²)

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Aug 17AE & JE Exams