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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 2
26.
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)
NPr
NPr1/3
NPr-1
NPr-1/3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.
0.38-0.78
0.5-50
100-1000
5-50
Answer: Option
Explanation:
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28.
Use of transverse baffles in a shell and tube heat exchanger is done to increase the
rate of heat transfer.
flow velocity.
turbulence of shell side fluid.
all (a), (b) and (c).
Answer: Option
Explanation:
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29.
The actual temperature drop across the heating surface of an evaporator depends on the
liquid depth over the heating surface.
solution being evaporated.
pressure difference between the steam chest and the vapor space above the boiling liquid.
all (a), (b) and (c)
Answer: Option
Explanation:
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30.
Economy of a multiple effect evaporator depends upon the
heat balance consideration
rate of heat transfer
both (a) and (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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