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GATE 2019: Heat Transfer Quiz 5

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Question 1

A energy transfer from a gray body is considered. A equivalent electrical network for heat radiation is produced, the resistance in an electrical circuit corresponds to;

Question 2

Find the view factor of the surface 2 w.r.t.surrounding. Given A₁ (area. = 6, A₂ = 5 and F₁₂ (view factor of surface 2 w.r.t surface 1) = 0.5

Question 3

Match list-I (Surface with orientations) with List-II (Equivalent emissivity) and select the correct answer using the codes given below the lists :
List-I
A- Infinite parallel planes
B- Body 1 completely enclosed by body 2 but body 1 is very small
C- Radiation exchange between two small gray bodies.
D- Two concentric cylinders with large lengths.
List-II
1- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image024.png$
2- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image025.png$
3- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image026.png$
4- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image027.png$

Question 4

Two black surfaces, AB and BC, of lengths 5m and 6m, respectively, are oriented as shown. Both surfaces extend infinitely into the third dimension. Given that view factor F12=0.5, T1=800K, T2=600K, T_surrounding=300K and Stefan Boltzmann constant

the heat transfer rate from Surface 2 to the surrounding environment is ____________ kW/m

Question 5

Consider a hemispherical furnace of diameter D = 5 m with a flat base. The dome of the furnace is black, and the base has an emissivity of 0.7. The base and dome of the furnace are maintained at uniform temperature of 400K and 1000K, respectively, the net rate of radiation heat transfer from the dome to the base surface during steady operation is ____________ kW.

Question 6

Two very large parallel plane with emissivities 0.3 and 0.8 exchange radiative energy. The percentage reduction in radiative energy transfer when a polished aluminium radiation shield ( $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image069.png$ ) is placed between them is __________%.

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ESE & GATE ME Heat Transfer

Nov 26ESE & GATE ME