# Radiation · Heat Transfer · GATE ME

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## Marks 1

GATE ME 2017 Set 2
The emissive power of a blackbody is $$P.$$ If its absolute temperature is doubled, the emissive power becomes
GATE ME 2016 Set 2
Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the outer cylinder is $${R_0}$$ and t...
GATE ME 2012
For an opaque surface, the absorptivity $$\left( \alpha \right),$$ transmissivity $$\left( \tau \right)$$ and reflectivity $$\left( \rho \right)$$ ...
GATE ME 2005
The following figure was generated from experimental data relating spectral black body emissive power to wave length at three temperatures $${T_1},{T_... GATE ME 2003 A plate having$$10\,\,c{m^2}$$area each side is hanging in the middle of a room of$$100\,\,{m^2}$$total surface area. The plate temperature and em... GATE ME 1994 The shape factors with themselves of two infinitely long black body concentric cylinders with a dia ratio of$$3$$are ....... For the inner and ........ GATE ME 1991 A diffuse radiation surface has GATE ME 1988 For a glass plate transitivity and reflectivity are specified as$$0.86$$and$$0.08$$respectively, the absorptivity of the glass plate is ## Marks 2 GATE ME 2017 Set 1 Two black surfaces,$$AB$$and$$BC,$$of lengths$$5m$$and$$6m,$$respectively, are oriented as shown. Both surfaces extend infinitely into the thi... GATE ME 2016 Set 3 Two large parallel plates having a gap of$$10mm$$in between them are maintained at temperatures$${T_1} = 1000\,\,K$$and$${T_2} = 400\,\,K$$... GATE ME 2016 Set 1 An infinitely long furnace of$$0.5m \times 0.4m$$cross-section is shown in the figure below. Consider all surfaces of the furnace to be black. The t... GATE ME 2015 Set 3 A solid sphere$$1$$of radius$$'r'$$is placed inside a hollow, closed hemispherical surface$$2$$of radius$$'4r'.$$The shape factor$${F_{2 - 1}...
GATE ME 2015 Set 2
The total emissive power of a surface is $$500$$ $$W/{m^2}$$ at a temperature $${T_1}$$ and $$1200$$ $$W/{m^2}$$ at a temperature $${T_2}$$, where the...
GATE ME 2014 Set 4
Two infinite parallel plates are placed at a certain distance apart. An infinite radiation shield is inserted between the plates without touching any ...
GATE ME 2014 Set 2
A hemispherical furnace of $$1$$ $$m$$ radius has the inner surface (emissivity, $$\varepsilon = 1$$) of its roof maintained at $$800K,$$ while its f...
GATE ME 2014 Set 3
A solid sphere of radius$${r_1} = 20\,\,mm$$ is placed concentrically inside a hollow sphere of radius $${r_2} = 30\,\,mm$$ as shown in the figure. ...
GATE ME 2013
Two large diffuse gray parallel plates, separated by a small distance, have surface temperatures of $$400$$ $$K$$ and $$300$$ $$K.$$ If the emissiviti...
GATE ME 2012
Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If $${D_1}$$ and $${D_2}$$ are the diameters of t...
GATE ME 2009
Radiative heat transfer is intended between the inner surfaces of two very largen isothermal parallel metal plates. While the upper plate (designated ...
GATE ME 2009
Radiative heat transfer is intended between the inner surfaces of two very largen isothermal parallel metal plates. While the upper plate (designated ...
GATE ME 2008
A hollow enclosure is formed between two infinitely concentric cylinders of radii $$1m$$ and $$2m$$ respectively. Radiative heat exchange takes place ...
GATE ME 2005
A solid cylinder (surface $$2$$) is located at the center of a hollow sphere (surface $$1$$). The diameter of the sphere is $$1m,$$ while the cylinder...
GATE ME 2002
What is the value of the view factor for two inclined flat plates having common edge of equal width, and with an angle of $$20$$ degrees?
GATE ME 2001
For the circular tube of equal length and diameter shown in fig below, the view factor $${F_{13}}$$ is $$0.17.$$ The view factor $${F_{12}}$$ in this...
GATE ME 1993
The radiative heat transfer rate per unit area $$\left( {W/{m^2}} \right)$$ between two plane parallel gray surfaces (emissivity $$=0.9$$) maintained ...

## Marks 5

GATE ME 2000
A thin metal plate is exposed to solar radiation. The air and the surroundings are at $${30^ \circ }C\,.$$ The heat transfer coefficient by free conve...
GATE ME 1995
Consider two large parallel plates, one at $${T_1} = {727^ \circ }C$$ with emissivity $${\varepsilon _1} = 0.8$$ and the other at $${T_2} = {227^ \cir... GATE ME 1991 An object has the shape of cubical box of side$$10cm,$$with no top cover. The box is placed inside a room whose dimensions are much larger than thos... GATE ME 1989 Two black plates, each one meter square, are placed parallel to each other in such a way that the radiation shape factor for the system is$$0.4. If...
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