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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 8
21.
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
once
twice
thrice
four times
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is
free convection
entry length problem in laminar forced conduction (developing thermal boundary layer)
mixed convection (both free and forced)
forced convection
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The purpose of providing bleed points in the evaporator is to
admit the feed
remove the product
facilitate removal of non-condensable gases
create vacuum
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Water always boils when its
temperature reaches 100° C.
vapour pressure equals 76 cm of Hg.
saturated vapour pressure equals the external pressure on its surface.
saturated vapour pressure is less than the atmospheric pressure.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
lower heat transfer area.
lower steam economy.
higher steam economy.
higher solute concentration in the product.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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