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MCQs

Total Questions : 66 | Page 4 of 7 pages
Question 31. Calculate the flux (kg/sq.m sec) if
Mass of dry solid = 8 kg; Wet surface area = 4 sq.m; Change in moisture content with time is 0.4 /sec;
  1.    0.4
  2.    0.6
  3.    0.8
  4.    0.9
 Discuss Question
Answer: Option C. -> 0.8
Answer: (c).0.8
Question 32. Find the gas phase mass transfer co-efficient for a unbound moisture to remove if the flux is 5 kg/sq.m sec and the difference in humidity of the liquid and the main stream is 0.5 units.
  1.    5
  2.    10
  3.    20
  4.    30
 Discuss Question
Answer: Option B. -> 10
Answer: (b).10
Question 33. The other part than the constant rate period in the Batch- Drying curve is falling rate period.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 34. The value of _________ remains constant while drying if speed and direction of gas flow never change.
  1.    Mass transfer co-efficient
  2.    Humidity
  3.    Moisture
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Mass transfer co-efficient
Answer: (a).Mass transfer co-efficient
Question 35. If the dry spot appears in the substance in the batch drying curve at ___________
  1.    Critical moisture content
  2.    Equilibrium moisture content
  3.    Bound moisture
  4.    Unbound moisture
 Discuss Question
Answer: Option A. -> Critical moisture content
Answer: (a).Critical moisture content
Question 36. After critical moisture content _________ starts.
  1.    Saturated drying region
  2.    Unsaturated dryinG ᵣegion
  3.    Constant drying region
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Saturated drying region
Answer: Unsaturated drying region
Question 37. After the unsaturated drying completed ________ starts to evaporate.
  1.    Bound
  2.    Unbound
  3.    Equilibrium
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Bound
Answer: (a).Bound
Question 38. Find the period if the initial and the final moisture content are 50% and 20%. Also the critical moisture content is 30%.
  1.    Constant rate period
  2.    Falling rate period
  3.    saturated period
  4.    None of the mentioned
 Discuss Question
Answer: Option B. -> Falling rate period
Answer: (b).Falling rate period
Question 39. Find the period if the initial and the final moisture content are 60% and 40%. Also the critical moisture content is 30%.
  1.    Constant rate period
  2.    Falling rate period
  3.    Unsaturated period
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Constant rate period
Answer: (a).Constant rate period
Question 40. Find the time taken to dry 50% to 40% of moisture (dry basis) if critical moisture content is 30%. If the weight of the wet solid is 5 kg and the product of area and the constant rate is 0.5 kg/min.
  1.    20 sec
  2.    40 sec
  3.    60 sec
  4.    80 sec
 Discuss Question
Answer: Option C. -> 60 sec
Answer: (c).60 sec

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