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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 7
16.
For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.
high pressure
vacuum
backward feed
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Circulation pump is located below the evaporater to
avoid cavitation.
avoid frequent priming.
create more suction head.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.
Stefan-Boltzman's
Planck's
Wien's displacement
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low
hardness
dissolved soilds content
suspended solids content
all (a), (b) and(c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
At steady state the temperature variation in a plane wall, made of two different solids I & II is shown below :

The thermal conductivity of material I
is smaller than that of II.
is greater than that of II.
is equal to that of II.
can be greater than or smaller than that of II.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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