Chemical Engineering - Heat Transfer

31.
The unit of conductance in SI unit is
W/m
W/m2
W/°K
W/m°K
Answer: Option
Explanation:
No answer description is available. Let's discuss.

32.
In a shell and tube heat exchanger, square pitch compared to triangular pitch
gives a higher shell side pressure drop.
gives a lower shell side pressure drop.
can pack more surface area into a shell of given diameter.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

33.
Which of the following has maximum thermal conductivity ?
Iron
Coal
Nitrogen
Tar
Answer: Option
Explanation:
No answer description is available. Let's discuss.

34.
A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
6
12
18
24
Answer: Option
Explanation:
No answer description is available. Let's discuss.

35.
The film co-efficient between condensing vapour and metal wall increases with
increasing temperature of the vapour.
decreasing temperature of the vapour.
increasing viscosity of the film of condensate.
increasing temperature drop.
Answer: Option
Explanation:
No answer description is available. Let's discuss.