Chemical Engineering - Heat Transfer

16.
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it
decreases the pressure drop.
decreases the outlet temperature of cooling medium.
increases the overall heat transfer coefficient.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

17.
When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.
pool
nucleate
transition
film
Answer: Option
Explanation:
No answer description is available. Let's discuss.

18.
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)
0.2 D
0.5 D
0.66 D
0.80 D
Answer: Option
Explanation:
No answer description is available. Let's discuss.

19.
Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K )
t4
T4
1/t4
1/T4
Answer: Option
Explanation:
No answer description is available. Let's discuss.

20.
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is
2.36
4.36
120.36
dependent on NRe only
Answer: Option
Explanation:
No answer description is available. Let's discuss.