Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

The critical pressure of a liquid is the pressure
A:
above which a liquid will remain a liquid
B:
above which a liquid will explode
C:
above which a liquid will always convert into a vapour
D:
below which a liquid will always be in vapour form
Answer: A
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Free convection flow depends on
A:
density
B:
coefficient of viscosity
C:
gravitational force
D:
all of these
Answer: D
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The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to
A:
-1/3
B:
-2/3
C:
1
D:
-1
Answer: A
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Which of the following would lead to a reduction in thermal resistance?
A:
In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
B:
In convection, stirring of the fluid and cleaning the heating surface.
C:
In radiation, increasing the temperature and reducing the emissivity.
D:
all of the above
Answer: D
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The emissivity for a black body is
A:
0
B:
0.5
C:
0.75
D:
1
Answer: D
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