1
GATE ME 1994
MCQ (Single Correct Answer)
+1
-0.3
Two insulting materials of thermal conductivity $$K$$ and $$2K$$ are available for lagging a pipe carrying a hot fluid. If the radial thickness of each material is same
A
Material with higher thermal conductivity should be used for inner layer and one with lower thermal conductivity for the outer.
B
Material with lower thermal conductivity should be used for the inner layer and one with higher thermal conductivity for the outer.
C
It is immaterial in which sequence the insulating materials are used
D
It is not possible to judge unless numerical values of dimensions are given
2
GATE ME 1994
True or False
+1
-0
When the fluid velocity is doubled the thermal time constant of a thermometer used for measuring the fluid temperature reduces by a factor of $$2$$
A
TRUE
B
FALSE
3
GATE ME 1994
True or False
+1
-0
For air near atmospheric condition flowing over a flat plate the laminar thermal boundary layer is thicker than hydrodynamic boundary layer
A
TRUE
B
FALSE
4
GATE ME 1994
Fill in the Blanks
+1
-0
The shape factors with themselves of two infinitely long black body concentric cylinders with a dia ratio of $$3$$ are ....... For the inner and ..... for the outer
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