Related Questions

When one of the fluids is highly corrosive and has fouling tendency, it should
A Preferably flow inside the tube for its easier internal cleaning
B Perferably flow outside the tube
C Flow at a very slow velocity
D Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.
A Wetted wall
B Bubble cap
C Perforated tray
D Packed
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.
A Molal flow rate of vapour
B Vapour molecular weight
C Pressure and temperature
D All of the above
For contacting a highly soluble gas with a liquid
A Bubble the gas through liquid
B Spray the liquid on gas stream
C Either A or B would suffice
D None of these
The equipment used in the extraction of highly corrosive radio active liquids is
A Pulse column
B Spray column
C Mixer settler
D Baffle tower
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
A Sand bed filter
B Plate and frame filter press
C Vacuum filter
D Batch basket centrifuge
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
A Less than
B More than
C Same as
D Very much less
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
A > 4 :1
B > 8:1
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
A 10-15
B 30-40
C 70-80
D 90-100
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
A Is greater than
B Is lower than
C Is same as
D Cannot be predicted as data are insufficient

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