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## Marks 1

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Steady one-dimensional heat conduction takes place across the faces $$1$$ and $$3$$ of a composite slab consisting of sl...
GATE ME 2016 Set 3
A hollow cylinder has length $$L,$$ inner radius $${{r_1}}$$, outer radius $${{r_2}}$$, and thermal conductivity $$k.$$ ...
GATE ME 2016 Set 2
A plastic sleeve of outer radius $${r_0} = 1\,\,mm$$ covers a wire (radius $$r = 0.5$$ $$mm$$) carrying electric current...
GATE ME 2016 Set 1
If a foam insulation is added to a $$4cm$$ outer diameter pipe as shown as figure, the critical radius of insulation (i...
GATE ME 2015 Set 2
As the temperature increases, the thermal conductivity of a gas
GATE ME 2014 Set 4
Consider a long cylindrical tube of inner and outer radii, $${r_i}$$ and $${r_0}$$ , respectively, length, $$L$$ and the...
GATE ME 2014 Set 3
Consider one-dimensional steady state heat conduction along x-axis $$\left( {0 \le x \le L} \right),$$ through a planewa...
GATE ME 2013
Consider one-dimensional steady state heat conduction, without heat generation, in a plane wall; with boundary condition...
GATE ME 2013
A pipe of $$25$$ $$mm$$ outer diameter carries steam. The heat transfer coefficient between the cylinder and surrounding...
GATE ME 2011
In a composite slab, the temperature at the interface (Tinter) between two materials is equal to the average of the temp...
GATE ME 2006
In case of one dimensional heat conduction in a medium with constant properties, $$T$$ is the temperature at position $$... GATE ME 2005 One dimensional unsteady state heat transfer equation for a sphere with heat generation at the rate$$'{q_g}',$$can be ... GATE ME 2004 In descending order of magnitude, the thermal conductivity of$$(a)$$Pure iron,$$(b)$$liquid water,$$(c)$$saturated... GATE ME 2001 For a given heat flow and for the same thickness, the temp drop across the material will be maximum for GATE ME 1996 Two insulting materials of thermal conductivity$$K$$and$$2K$$are available for lagging a pipe carrying a hot fluid. ... GATE ME 1994 Thermal conductivity is lower for GATE ME 1990 ## Marks 2 More Heat is generated uniformly in a long solid cylindrical rod ( diameter$$ = 10\,\,mm$$) at the rate of$$4 \times {10^7}...
GATE ME 2017 Set 1
A brick wall $$\,\left( {k = 0.9{W \over {m.K}}} \right)$$ of thickness $$0.18$$ $$m$$ separates the warm air in a room ...
GATE ME 2015 Set 3
A cylindrical uranium fuel rod of radius 5 mm in a nuclear reactor is generating heat at the rate of $$4 \times {10^7}\,... GATE ME 2015 Set 2 A$$10mm$$diameter electrical conductor is covered by an insulation of$$2mm$$thickness. The conductivity of... GATE ME 2015 Set 1 A plane wall has a thermal conductivity of$$1.15W/m.K.$$If the inner surface is at$${1100^ \circ }C$$and the ou... GATE ME 2014 Set 4 Heat transfer through a composite wall is shown in figure. Both the sections of the wall have equal thickness$$\left( \...
GATE ME 2014 Set 3
A material $$P$$ of thickness $$1$$ $$mm$$ is sandwiched between two steel slabs, as shown in the figure below. $$A$$ he...
GATE ME 2014 Set 2
Consider steady-state heat conduction across the thickness in a plane composite wall as shown in fig exposed to convecti...
GATE ME 2009
For the three dimensional object shown in the fig below. Five faces are insulated. The sixth face $$(PQRS),$$ which is n...
GATE ME 2008
Steady two dimensional heat conduction takes place in the body shown in the fig below. The normal temperature gradients ...
GATE ME 2008
Building has to be maintained at $${21^ \circ }C$$ (dry bulb) and $${14.5^ \circ }C$$ (wet bulb). The dew point temp und...
GATE ME 2007
Consider steady one-dimensional heat flow in a plate of $$20mm$$ thickness with a uniform heat generation of $$80MW/{m^3... GATE ME 2007 Consider steady one-dimensional heat flow in a plate of$$20mm$$thickness with a uniform heat generation of$$80MW/{m^3...
GATE ME 2007
A $$100$$ $$W$$ electric bulb was switched on in a $$2.5 \times 3 \times 3m$$ size thermally insulated room having tempe...
GATE ME 2006
With an increase in the thickness of insulation around a circular pipe, heat loss to surroundings due to
GATE ME 2006
Heat flows through a composite slab, as shown below. The depth of the slab is $$1$$ $$m.$$ the $$k$$ values are in $$W/m... GATE ME 2005 Heat is being transferred by convection from water at$${48^ \circ }C$$to a glass plate whose surface that is exposed t... GATE ME 2003 Heat is being transferred by convection from water at$${48^ \circ }C$$to a glass plate whose surface that is exposed t... GATE ME 2003 It is proposed to coat a$$1mm$$diameter wire with enamel paint$$\left( {k\,\,\,\, = 0.1W/m} \right.$$-$$\left. K \r...
GATE ME 1999
The temp variation under steady heat conduction across a composite slab of two materials with thermal conductivies $${K_... GATE ME 1998 For a current carrying wire of$$20mm$$diameter and having$$k=0.5W/mK$$is exposed to air$$\left( {h = 20W/{m^2}...
GATE ME 1996
Match the property with their units Property $$A.$$ Bulk modulus $$B.$$ Thermal conductivity $$C.$$ Heat transfer coe...
GATE ME 1991

## Marks 5

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A copper tube of $$20$$ $$mm$$ outer diameter, $$1$$ $$mm$$ thickness and $$20$$ $$m$$ long (Thermal conducti-vity$$= 4... GATE ME 2002 A composite wall, having unit length normal to the plane of paper, is insulated at the top and bottom as shown in the fi... GATE ME 2001 A gas filled tube has$$2mm$$inside diameter and$$25cm$$length. The gas is heated by an electrical wire of ... GATE ME 1998 An electric hot plate is maintained at a temperature of$${350^ \circ }C,$$and is used to keep a solution boiling at$$...
GATE ME 1993
Steam is flowing through an insulated steel pipe shown in the fig, is losing heat to the surroundings. The details are a...
GATE ME 1988

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