A. Reducing scale deposition
B. Increasing pressure drop
C. Fixing the tubes
D. Creating turbulence
A. 0.1-0.2
B. 0.2-0.5
C. 0.4-0.9
D. 1.2-1.5
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. Overall plate efficiency
B. Murphree plate efficiency
C. Point efficiency
D. None of these
A. ∞
B. 1
C. 20.8
D. 2
A. The downcomer design and the residence time in the downcomer is almost same for sieve
plate and bubble cap columns
B. Weir length for a bubble cap plate is the same as that for the sieve plate
C. Weir height for a bubble cap plate column is the same as that for a sieve plate column
D. Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the
sieve plate
A. Larger dia vessel
B. Smaller dia vessel
C. Larger dia long vessel
D. Strength of the vessel is same irrespective of the diameter