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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 7
46.
The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as
(ΔT)1/4
ΔT1/2
(ΔT)5/4
(ΔT)3/4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.
increase
decrease
not affect
increase the condensing film co-efficient as well as
Answer: Option
Explanation:
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48.
Prandtl and Reynold's analogies are identical for Prandtl number value of
0
0.5
1
5
Answer: Option
Explanation:
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49.
The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
its evaporation loss
excessive corrosion
uneconomic LMTD
decrease in heat exchanger efficiency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
In evaporators, lowering the feed temperature
increases the heating area required.
reduces the economy.
both (a) and (b).
decreases the heating area required.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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