1
GATE ME 2008
MCQ (Single Correct Answer)
+1
-0.3
For flow of fluid over a heated plate, the following fluid properties are known: Viscosity $$=0.001Pa.s;$$ Specific heat at constant pressure $$=1$$ $$kJ/kgK;$$ Thermal conductivity $$=$$ $$W/mK,$$ The hydrodynamic boundary layer thickness at a specified location on the plate is $$1mm,$$ thermal boundary layer thickness at the same location is
A
$$0.001mm$$
B
$$0.01mm$$
C
$$1mm$$
D
$$1000mm$$
2
GATE ME 1998
MCQ (Single Correct Answer)
+1
-0.3
Heat transfer coefficients for free convection in gasses, forced convection in gases and vapors, and for boiling water lie, respectively, in the range of
A
$$5-15, 20-200$$ and $$3000-50000$$ $$W/{m^2}K$$
B
$$20-50, 200-500,$$ and $$50000-100000$$ $$W/{m^2}K$$
C
$$50-100, 500-1000$$ and $$100000-1000000$$ $$W/{m^2}K$$
D
$$20-100, 200-1000$$ and a constant $$1000000$$ $$W/{m^2}K$$
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 1990
MCQ (Single Correct Answer)
+1
-0.3
In pool boiling the highest $$HTC$$ occurs in
A
Sub-cooled boiling zone
B
Nucleate boiling zone
C
Partial film boiling zone
D
Film boiling zone
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