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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 3
31.
In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.
increases
decreases
does not affect
may increase or decrease, depends on the type of baffle
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)
∝ t
∝ 1/t
∝ t
independent of 't'
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
Heat transfer co-efficient (h1) for liquids increases with
increasing temperature.
decreasing temperature.
decreasing Reynolds number.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
A diathermaneous substance __________ the thermal radiation completely.
absorbs
reflects
transmits
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
A hot body will radiate heat most rapidly, if its surface is
white & rough
black & rough
white & polished
black & polished
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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