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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 1
16.
Fouling factor
is a dimensionless quantity.
does not provide a safety factor for design.
accounts for additional resistances to heat flow.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient
increases
decreases
is not affected
may increase or decrease; depends on the feed
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
The steam ejector is used to
remove condensate from the steam pipelines.
create vacuum.
superheat the steam.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
increases
decreases
remains constant
passes through a maxima
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
(COP)R = (COP)HP = 0.6
(COP)R = 2.5; (COP)HP = 1.5
(COP)R = 1.5; (COP)HP = 2.5
(COP)R = (COP)HP = 2.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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