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MCQs

Total Questions : 65 | Page 5 of 7 pages
Question 41. What is the value of overall heat transfer coefficient for air to heavy tars and liquid?
  1.    As low as 45 W/m² K
  2.    As low as 40 W/m² K
  3.    As low as 35 W/m² K
  4.    As low as 30 W/m² K
 Discuss Question
Answer: Option A. -> As low as 45 W/m² K
Answer: (a).As low as 45 W/m² K
Question 42. Which one is having lowest value of overall heat transfer coefficient?
  1.    Steam
  2.    Air condensers
  3.    Air to heavy tars
  4.    Ammonia condensers
 Discuss Question
Answer: Option C. -> Air to heavy tars
Answer: (c).Air to heavy tars
Question 43. What is the value of overall heat transfer coefficient for air to low viscosity liquid?
  1.    As high as 900 W/m² K
  2.    As high as 800 W/m² K
  3.    As high as 700 W/m² K
  4.    As high as 600 W/m² K
 Discuss Question
Answer: Option D. -> As high as 600 W/m² K
Answer: (d).As high as 600 W/m² K
Question 44. What is the value of overall heat transfer coefficient for air condensers?
  1.    350-780 W/m² K
  2.    250 -900 W/m² K
  3.    200-350 W/m² K
  4.    200-1950 W/m² K
 Discuss Question
Answer: Option A. -> 350-780 W/m² K
Answer: (a).350-780 W/m² K
Question 45. What is the value of overall heat transfer coefficient ammonia condensers?
  1.    800-1400 W/m² K
  2.    200-750 W/m² K
  3.    250-2500 W/m² K
  4.    1500-1750 W/m² K
 Discuss Question
Answer: Option A. -> 800-1400 W/m² K
Answer: (a).800-1400 W/m² K
Question 46. Identify the correct expression for effectiveness
  1.    4 – exponential (- NTU)
  2.    3 – exponential (- NTU)
  3.    2 – exponential (- NTU)
  4.    1 – exponential (- NTU)
 Discuss Question
Answer: Option D. -> 1 – exponential (- NTU)
Answer: (d).1 – exponential (- NTU)
Question 47. In a gas turbine recuperator, the expression for effectiveness for the parallel flow configuration reduces to
  1.    1 – exponential (- NTU)/3
  2.    1 – exponential (- NTU)/4
  3.    1 – exponential (- 2 NTU)/2
  4.    1 – exponential (- NTU)/6
 Discuss Question
Answer: Option C. -> 1 – exponential (- 2 NTU)/2
Answer: (c).1 – exponential (- 2 NTU)/2
Question 48. What is the maximum efficiency for parallel flow heat exchanger?
  1.    5%
  2.    10%
  3.    20%
  4.    50%
 Discuss Question
Answer: Option A. -> 5%
Answer: (a).5%
Question 49. In a gas turbine recuperator, the capacity ratio becomes
  1.    2
  2.    1
  3.    4
  4.    3
 Discuss Question
Answer: Option B. -> 1
Answer: (b).1
Question 50. The curve of effectiveness versus NTU parameters indicates the relationship between
(i) Effectivenes
(ii) NTU MAX
(iii) C MIN/C MAX
Identify the correct statements
  1.    1 and 2
  2.    1, 2 and 3
  3.    2 only
  4.    3 only
 Discuss Question
Answer: Option B. -> 1, 2 and 3
Answer: (b).1, 2 and 3

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