7231. In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
Lewis
Grashoff
Sherwood
None of these
✅ The correct answer is option A.
Chemical Engineering
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7232. Flash distillation is
Same as differential distillation
Used for multicomponent systems like crude refining
Same as simple distillation
Most useful for handling binary systems
✅ The correct answer is option B.
7233. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)
Straight
Parallel
Both A & B
Neither A nor B
✅ The correct answer is option C.
7234. Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for
Constant molal overflow
Total reflux
Constant relative volatility
All of the above
✅ The correct answer is option D.
7235. Reverse osmosis is also called
Dialysis
Electrodilysis
Diffusion
Ultrafiltration
✅ The correct answer is option D.
7236. Operating velocity in a packed tower is usually __________ the flooding velocity.
Half
Twice
Equal to
More than
✅ The correct answer is option A.
7237. Refractory bricks are usually dried in a __________ dryer.
Tray
Tunnel
Conveyor
Festoon
✅ The correct answer is option B.
7238. In saturated gas, the
Vapour is in equilibrium with the liquid at the gas temperature
Vapour is in equilibrium with the liquid at the room temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
None of these
✅ The correct answer is option A.
7239. The commonly used solvent in supercritical extraction is
Methyl ethyl ketone
Water
Carbon tetrachloride
Carbon dioxide
✅ The correct answer is option D.
7240. An ideal tower packing should not
Have low weight per unit volume
Have large surface area per unit volume
Have large free cross-section
Hold up large amount of liquid in the packing
✅ The correct answer is option D.