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## Marks 1

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The emissive power of a blackbody is $$P.$$ If its absolute temperature is doubled, the emissive power becomes
GATE ME 2017 Set 2
Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the out...
GATE ME 2016 Set 2
For an opaque surface, the absorptivity $$\left( \alpha \right),$$ transmissivity $$\left( \tau \right)$$ and reflecti...
GATE ME 2012
The following figure was generated from experimental data relating spectral black body emissive power to wave length at ...
GATE ME 2005
A plate having $$10\,\,c{m^2}$$ area each side is hanging in the middle of a room of $$100\,\,{m^2}$$ total surface area...
GATE ME 2003
The shape factors with themselves of two infinitely long black body concentric cylinders with a dia ratio of $$3$$ are ....
GATE ME 1994
GATE ME 1991
For a glass plate transitivity and reflectivity are specified as $$0.86$$ and $$0.08$$ respectively, the absorptivity of...
GATE ME 1988

## Marks 2

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Two black surfaces, $$AB$$ and $$BC,$$ of lengths $$5m$$ and $$6m,$$ respectively, are oriented as shown. Both surfaces ...
GATE ME 2017 Set 1
Two large parallel plates having a gap of $$10$$ $$mm$$ in between them are maintained at temperatures $${T_1} = 1000\,\... GATE ME 2016 Set 3 An infinitely long furnace of$$0.5m \times 0.4m$$cross-section is shown in the figure below. Consider all surfaces of ... GATE ME 2016 Set 1 A solid sphere$$1$$of radius$$'r'$$is placed inside a hollow, closed hemispherical surface$$2$$of radius$$'4r'.$$... GATE ME 2015 Set 3 The total emissive power of a surface is$$500W/{m^2}$$at a temperature$${T_1}$$and$$1200W/{m^2}$$at a te... GATE ME 2015 Set 2 A hemispherical furnace of$$1m$$radius has the inner surface (emissivity,$$\varepsilon = 1$$) of its roof maint... GATE ME 2014 Set 2 Two infinite parallel plates are placed at a certain distance apart. An infinite radiation shield is inserted between th... GATE ME 2014 Set 4 A solid sphere of radius$${r_1} = 20\,\,mm$$is placed concentrically inside a hollow sphere of radius$${r_2} = 30\,\,m...
GATE ME 2014 Set 3
Two large diffuse gray parallel plates, separated by a small distance, have surface temperatures of $$400$$ $$K$$ and $$... GATE ME 2013 Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If$${D_1}$$and$$...
GATE ME 2012
Radiative heat transfer is intended between the inner surfaces of two very largen isothermal parallel metal plates. Whil...
GATE ME 2009
Radiative heat transfer is intended between the inner surfaces of two very largen isothermal parallel metal plates. Whil...
GATE ME 2009
A hollow enclosure is formed between two infinitely concentric cylinders of radii $$1m$$ and $$2m$$ respectively. Radiat...
GATE ME 2008
A solid cylinder (surface $$2$$) is located at the center of a hollow sphere (surface $$1$$). The diameter of the sphere...
GATE ME 2005
What is the value of the view factor for two inclined flat plates having common edge of equal width, and with an angle o...
GATE ME 2002
For the circular tube of equal length and diameter shown in fig below, the view factor $${F_{13}}$$ is $$0.17.$$ The vi...
GATE ME 2001
The radiative heat transfer rate per unit area $$\left( {W/{m^2}} \right)$$ between two plane parallel gray surfaces (em...
GATE ME 1993

## Marks 5

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A thin metal plate is exposed to solar radiation. The air and the surroundings are at $${30^ \circ }C\,.$$ The heat tran...
GATE ME 2000
Consider two large parallel plates, one at $${T_1} = {727^ \circ }C$$ with emissivity $${\varepsilon _1} = 0.8$$ and the...
GATE ME 1995
An object has the shape of cubical box of side $$10cm,$$ with no top cover. The box is placed inside a room whose dimens...
GATE ME 1991
Two black plates, each one meter square, are placed parallel to each other in such a way that the radiation shape factor...
GATE ME 1989

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