Chemical Engineering - Heat Transfer

16.
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by
keeping the heat transfer surface clean.
enhancing the fluid pumping rate.
increasing the tube length.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

17.
Trap is used to remove __________ from steam pipe lines.
steam
condensate
non-condensables
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.

18.
A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is
125
133
150
160
Answer: Option
Explanation:
No answer description is available. Let's discuss.

19.
Tube pitch is the __________ of tube diameters and the clearances.
sum
difference
ratio
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.

20.
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer
decreases
increases
increases exponentially
remains unaffected
Answer: Option
Explanation:
No answer description is available. Let's discuss.