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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 1
26.
Pick out the wrong statement.
Orifice baffles are never used in a shell and tube heat exchanger.
Pressure drop on the shell side of a heat exchanger depends upon tube pitch also.
In a horizontal tube evaporator, surface blanketing by air is avoided.
Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.
laminar
transition
both 'a' & 'b'
highly turbulent
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
The actual temperature drop across the heating surface in an evaporator depends on the
feed.
depth of liquid over heating surface.
pressure difference between steam chest and vapour space.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Which of the following is not used as a medium for high temperature heating ?
Dowtherm
mercury
liquid metal (e.g. molten sodium)
fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Presence of a non-condensing gas in a condensing vapour
increases the rate of condensation.
decreases thermal resistance.
is desirable to increase the film co-efficient.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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