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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 6
16.
Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then
U1 = U2
U2 > U1
U1 > U2
U1 = dirt factor - U2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
In SI units, thermal conductivity is expressed in
Watt/m.°K
Watt/m2. °K
Watt/m2. °K
Watt/m4. °K
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.
boiling point (at the same pressure)
viscosity
density
thermal conductivity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.
average
geometric mean
product
sum
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?
0.5
< 0.5
> 0.6
< 0.1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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