46.
For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?

47.
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

49.
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

50.
Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency