Related Questions

Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?
A Grid tray tower
B Perforated tray tower
C Wetted wall tower
D Bubble cap tower
A passenger paid 50% customs duty on accompanied baggage items. He paid another 20% sales tax on the total value of the items plus the custom duty paid. The total custom duty and sales tax is Tk. 350. what is the value of the item custom duty and sales tax?
A Tk.400
B Tk. 450
C Tk. 500
D None these
Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness. Dry eyes were more frequently experienced by customers who wore contact lenses than by custorners who did not wear contact lenses. The pharmacists concluded that wearing contact lenses, by itself, can cause contact wearers to have dry eyes.
A An inherited condition can cause both weak eyesight and dry eyes
B Physical exertion causes dry eyes in many people who wear contact lenses.
C Most people who have dry eyes do not wear contact lenses.
D Most people who wear contact lenses do not have dry eyes.
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
Which of the following provides maximum contact surface for a liquid-vapour system?
A Packed tower
B Bubble-cap plate column
C Seive-plate column
D Wetted wall column
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
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
__________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.
A Sieve plate
B Packed
C Bubble cap plate
D None of these
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
A lower pair
B higher pair
C self-closed pair
D force-closed pair
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
A Sphere
B Cube
C Cylinder (L/D = 1)
D Raschig rings

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