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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 6
36.
Nusselt number is the ratio of the
temperature gradient of the wall to that across the entire pipe.
temperature difference to the temperature gradient at the wall.
heat flux at the wall to that across the entire pipe.
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Prandtl number is the ratio of
momentum diffusivity to mass diffusivity.
momentum diffusivity to thermal diffusivity.
thermal diffusivity to mass diffusivity.
thermal diffusivity to momentum diffusivity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger ?
Tube side pressure drop and the heat transfer rate.
Convective heat transfer co-efficient.
Effective tube surface area for convective heat transfer.
All (a) (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
Long vertical evaporator
Horizontal tube evaporator
Agitated film evaporator
Calenderia vertical tube evaporator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
"The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law.
Kirchoffs
Planck's
Wien's displacement
Stefan-Boltzman
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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