In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds. 17.5 12.5 5 2.5 TRUE ANSWER : ? YOUR ANSWER : ?
Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is pD/3t pD/4t pD/2t pD/6t TRUE ANSWER : ? YOUR ANSWER : ?
The LMTD correction factor (FT) is applied in __________ heat exchangers. 1-1 cocurrent All of these All multipass Double pipe TRUE ANSWER : ? YOUR ANSWER : ?
Baffles may be eliminated for None of these Low viscosity liquids (< 200 poise) High viscosity liquids (> 600 poise) Large diameter tanks TRUE ANSWER : ? YOUR ANSWER : ?
Generally, elliptical dished heads All of these Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m² TRUE ANSWER : ? YOUR ANSWER : ?
Vertical vessels are not supported by Skirts Brackets Columns Saddles TRUE ANSWER : ? YOUR ANSWER : ?
Excessive liquid gradient on a tray may result in the Back trapping Gas blowing beneath cap skit All of these Maldistribution of gas TRUE ANSWER : ? YOUR ANSWER : ?
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as D = 1.5 t D = 1.6 √t D = 1.1 t D = 3√t TRUE ANSWER : ? YOUR ANSWER : ?
Value of Peclet number = 0, is the representative of Plug flow Eddy diffusivity = 0 Laminar flow Complete back mixing TRUE ANSWER : ? YOUR ANSWER : ?
For high pressure process equipments/vessels, the connected nozzle should be Flanged Screwed Brazed Welded TRUE ANSWER : ? YOUR ANSWER : ?