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MCQs

Total Questions : 63 | Page 7 of 7 pages
Question 61. For laminar film condensation on a vertical plate, the velocity distribution at a distance δ from the top edge is given by
  1.    p g (δ y – y/2)/σ
  2.    p g (δ y – y²)/σ
  3.    p g (δ y – y²/2)/σ
  4.    p g (δ – y²/2)/σ
 Discuss Question
Answer: Option C. -> p g (δ y – y²/2)/σ
Answer: (c).p g (δ y – y²/2)/σ
Question 62. For laminar film condensation on a vertical plate, the gravitational acceleration g is replaced by
  1.    4 g sin α
  2.    3 g sin α
  3.    2 g sin α
  4.    g sin α
 Discuss Question
Answer: Option D. -> g sin α
Answer: (d).g sin α
Question 63. Mark the wrong statement with respect to laminar flow condensation on a vertical plate
  1.    The rate of condensation heat transfer is maximum at the upper edge of the plate and progressively decreases as the lower edge is approached
  2.    The average heat transfer coefficient is two third of the local heat transfer coefficient at the lower edge of the plate
  3.    At a definite point on the heat transfer, the film coefficient is directly proportional to thermal conductivity and inversely proportional to thickness of film at the point
  4.    The film thickness increases as the fourth root of the distance down the upper edge
 Discuss Question
Answer: Option B. -> The average heat transfer coefficient is two third of the local heat transfer coefficient at the lower edge of the plate
Answer: (b).The average heat transfer coefficient is two third of the local heat transfer coefficient at the lower edge of the plate

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