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MCQs

Total Questions : 3241 | Page 28 of 325 pages
Question 271. The critical moisture content in case of drying indicates the __________ rate period.
  1.    Beginning of falling
  2.    Beginning of constant
  3.    End of falling
  4.    None of these
 Discuss Question
Answer: Option A. -> Beginning of falling
Question 272. Rayleigh's equation applies to __________ distillation.
  1.    Continuous
  2.    Steam
  3.    Differential
  4.    Flash
 Discuss Question
Answer: Option C. -> Differential
Question 273. When the solvent dissolves very little of solute, then
  1.    Solvent of low latent heat of vaporisation should be used
  2.    Solvent of low freezing point should be used
  3.    Large quantity of solvent is required to extract the solute
  4.    Very small quantity of solvent is required
 Discuss Question
Answer: Option C. -> Large quantity of solvent is required to extract the solute
Question 274. For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.
  1.    Unsaturated surface
  2.    Constant rate
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 275. Ion exchange process is similar to
  1.    Absorption
  2.    Adsorption
  3.    Extraction
  4.    Leaching
 Discuss Question
Answer: Option B. -> Adsorption
Question 276. Mechanism of moisture removal in case of freeze drying of food stuff is by
  1.    Evaporation
  2.    Sublimation
  3.    Dehydration
  4.    Adsorption
 Discuss Question
Answer: Option B. -> Sublimation
Question 277. The caking of crystals can be prevented by
  1.    Maintaining high critical humidity
  2.    Maintaining low critical humidity
  3.    Coating the product with inert material
  4.    Both A and C
 Discuss Question
Answer: Option D. -> Both A and C
Question 278. A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids?
  1.    0
  2.    1
  3.    2
  4.    3
 Discuss Question
Answer: Option A. -> 0
Question 279. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
  1.    6.89
  2.    8.89
  3.    10
  4.    8.25
 Discuss Question
Answer: Option B. -> 8.89
Question 280. In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.
  1.    Molecular
  2.    Azeotropic
  3.    Extractive
  4.    Flash
 Discuss Question
Answer: Option C. -> Extractive

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