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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 7
1.
Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
basket type
horizontal tube
calendria
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Harmonic mean temperature difference is given by
ΔT1 . ΔT2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is
thin walled having the value of Ao Ai/< 2.
thick walled.
having the value of Ao/Ai > 2.
both (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for
cube
cylinder
sphere
equal for all the three
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about
50 -100 Kcal/hr.m2.°C
50 -100 W/m2 . °K
50 -100 BTU/hr. ft.2°F
1000 - 1500 BTU/hr. ft.2°F
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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