291. At minimum reflux ratio for a given separation
Number of plates is zero
Number of plates is infinity
Minimum number of the theoretical plates is required
Separation is most efficient
✅ The correct answer is option B.
Mass Transfer MCQs
292. The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature.
Dew point
Wet bulb
Dry bulb
None of these
✅ The correct answer is option D.
293. Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?
Dew point
Humidity ratio
Wet bulb temperature
None of these
✅ The correct answer is option C.
294. Mechanism of moisture removal in case of freeze drying of food stuff is by
Evaporation
Sublimation
Dehydration
Adsorption
✅ The correct answer is option B.
295. Steam distillation is not recommended to be used, if the
Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
✅ The correct answer is option A.
296. The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is
0
∞
#REF!
#REF!
✅ The correct answer is option C.
297. Wetted wall tower experiment determines the
Molal diffusivity
Volumetric co-efficient
Mass transfer co-efficient
None of these
✅ The correct answer is option C.
298. Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?
Cooling and dehumidification
Heating and dehumidification at almost constant wet bulb temperature
Dehumidification with dry bulb temperature remaining constant
None of these
✅ The correct answer is option B.
299. For a distillation column operating at minimum reflux, the
Concentration of liquid and vapour leaving a plate will be same
Reflux ratio will be maximum
Number of plates required will be maximum
None of these
✅ The correct answer is option C.
300. For contacting a highly soluble gas with a liquid
Bubble the gas through liquid
Spray the liquid on gas stream
Either A or B would suffice
None of these
✅ The correct answer is option A.