Pick out the wrong statement?
A. If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in the downcomer, it may entrain some vapour
B. The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding
C. The discharge end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble c
D. None of these
A. 1 to 5
B. 10 to 20
C. 30 to 40
D. 40 to 50
Pick out the wrong statement pertaining to the design of a horizontal tube evaporator ?
A. It is unsuitable for concentrating those liquids, which form a scale or deposit salt
B. It is suitable for process, in which the final product is a liquor instead of solid
C. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres
D. Liquor flows inside the tube, while the steam is outside submerging the tube
A. 1.3 to 2
B. 1.6 to 2
C. 2.5
D. 1.5 to 3
______________ closure is the weakest enclosure for cylindrical vessels?
A. Hemispherical
B. Torispherical
C. Conical or flat plate
D. Elliptical