Chemical Engineering - Process Equipment and Plant Design

6.
Back-trapping in a distillation column results due to
low gas velocity.
high gas velocity.
excessive liquid gradient over the tray.
low reflux ratio.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

7.
For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used ?
0.8
0.9
1.0
(0.8)0.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.

8.
Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
less
more
same
either (a) or (b); no generalisation can be made
Answer: Option
Explanation:
No answer description is available. Let's discuss.

9.
The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.
5
15
7.5
50
Answer: Option
Explanation:
No answer description is available. Let's discuss.

10.
Lap joints are preferred for plates having thickness __________ mm.
< 12.5
> 3
> 5
5-10
Answer: Option
Explanation:
No answer description is available. Let's discuss.