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GATE ME: Heat Transfer Champion Quiz 5

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Question 1

The following figure was generated from experimental data relating spectral black body emissive power to wave length at three temperatures T₁, T₂ and T₃ (T₁> T₂ <T₃).
$Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2005_files\image041.png$
The conclusion is that the measurements are

Question 2

With an increase in thickness of insulation around a circular pipe, heat loss to surroundings due to

Question 3

The spectral energy distribution for a body at temperature T is shown in figure. Now if the temperature of the body is increased

Question 4

The object shape is affected in heat transfer by:

Question 5

For the circular tube of equal length and diameter shown below, the view factor F₁₃ is 0.17. The view factor F₁₂ in this case will be

Question 6

Two large parallel plates having a gap of 10 mm in between them are maintained at temperature T₁= 1000 K and T₂= 400 K. Given emissivity values,

=0.5,

=0.25 and Stefan-Boltzmann constant

the heat transfer between the plates (in kW/m²) is ______

Question 7

Two large diffuse gray parallel plates, separated by a small distance, have surface temperatures of 400 K and 300 K. If the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 × 10^-8W/m²K⁴, the net radiation heat exchange rate in kW/m² between the two plates is

Question 8

A hemispherical furnace of 1 m radius has the inner surface (ϵ =1) of its roof maintained at 800 K, while its floor (ϵ = 0.5)is kept at 600 K. Stefan-Boltzmann constant is 5.668×10^-8W/m²K⁴. The net radiative heat transfer (in kW) from the roof to the floor is

Question 9

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 10

Four rods with different rail r and length $Description: Description:ISROME2009_files\image018.png$ are connected to two reservoirs at different temperature. Which one of them will conduct most heat?

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ESE & GATE ME Heat Transfer

Oct 6ESE & GATE ME