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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 7
11.
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Thickness of the wall.
Area of the wall perpendicular to heat flow.
Material of the wall.
Temperature difference between the two surfaces of the wall.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Which of the following has the minimum thermal conductivity ?
Nitrogen
Steel
Carbon black
Tar
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
In a heat exchanger, one transfer unit means
a section of the exchanger in which change in temperature of one stream equals the average driving force in the section.
the size of the exchanger in which heat transfer rate is 1 kcal/hr.
both (a) and (b)
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then
hf = hd
hf > hd
hf < hd
hf could be greater or smaller than hd
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Pick out the wrong statement:
The capacity of an evaporator is reduced by the boiling point elevation.
Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger.
Steam jet ejector is used for vapor compression in a thermal recompression evaporator.
Heat sensitive materials should be concentrated in high pressure evaporators.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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