Process Equipment and Plant Design Objective Questions and Answers

8. Vapor velocity in a distillation column for non-foaming mixture is in the range of __________ times the flooding velocity.

9. Pick out the correct statement.

A. When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower

B. Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency

C. The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty

D. None of these

Discussion

10. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.

11. __________ heat exchanger is also known as 'hair pin type' exchanger,

12. The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is

A. $$\frac{{{\text{pd}}}}{{2{\text{t}}}}$$

B. $$\frac{{{\text{pd}}}}{{4{\text{t}}}}$$

C. $$\frac{{{\text{pd}}}}{{\text{t}}}$$

D. $$\frac{{{\text{pd}}}}{{3{\text{t}}}}$$

Discussion

13. A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is

14. The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.

Chemical Engineering Objective Questions { Process Equipment and Plant Design }