1
GATE ME 2016 Set 3
Numerical
+1
-0
Steady one-dimensional heat conduction takes place across the faces $$1$$ and $$3$$ of a composite slab consisting of slabs $$A$$ and $$B$$ in perfect contact as shown in the figure, where $${k_A},\,\,{k_B}$$ denote the respective thermal conductivities. Using the data as given in the figure, the interface temperature $${T_2}$$ $$\left( {in\,{\,^ \circ }C\left. \, \right)} \right.$$ is ______________. 2
GATE ME 2015 Set 2
Numerical
+1
-0
If a foam insulation is added to a $$4cm$$ outer diameter pipe as shown as figure, the critical radius of insulation (in $$cm$$) is ________. 3
GATE ME 2014 Set 4
+1
-0.3
As the temperature increases, the thermal conductivity of a gas
A
increases
B
decreases
C
remains constant
D
increases up-to a certain temperature and then decreases
4
GATE ME 2014 Set 3
+1
-0.3
Consider a long cylindrical tube of inner and outer radii, $${r_i}$$ and $${r_0}$$ , respectively, length, $$L$$ and thermal conductivity, $$k.$$ Its inner and outer surfaces are maintained at $${T_i}$$ and $${T_0}$$ , respectively $$\left( {{T_i}\,\,\, > \,\,\,{T_0}} \right).$$ Assuming one-dimensional steady state heat conduction in the radial direction, the thermal resistance in the wall of the tube is
A
$${1 \over {2\pi kL}}\ell n\left( {{{{r_i}} \over {{r_0}}}} \right)$$
B
$${L \over {2\pi {r_i}k}}$$
C
$${L \over {2\pi kL}}\ell n\left( {{{{r_0}} \over {{r_i}}}} \right)$$
D
$${L \over {4\pi kL}}\ell n\left( {{{{r_0}} \over {{r_i}}}} \right)$$
GATE ME Subjects
Engineering Mechanics
Machine Design
Strength of Materials
Heat Transfer
Production Engineering
Industrial Engineering
Turbo Machinery
Theory of Machines
Engineering Mathematics
Fluid Mechanics
Thermodynamics
General Aptitude
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