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MCQs

Total Questions : 2525 | Page 7 of 253 pages
Question 61. If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.
  1.    Parabolic
  2.    Hyperbolic
  3.    Linear
  4.    Logarithmic
 Discuss Question
Answer: Option A. -> Parabolic
Question 62. In a single effect evaporator, the economy is
  1.    1
  2.    < 1
  3.    > 1
  4.    None of these
 Discuss Question
Answer: Option B. -> < 1
Question 63. Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.
  1.    Long tube
  2.    Falling film
  3.    High pressure
  4.    None of these
 Discuss Question
Answer: Option B. -> Falling film
Question 64. Dropwise condensation is promoted on a/an __________ surface.
  1.    Glazed
  2.    Oily
  3.    Coated
  4.    Smooth
 Discuss Question
Answer: Option B. -> Oily
Question 65. Film condensation is promoted on a/an __________ surface.
  1.    Oily
  2.    Coated
  3.    Clean & smooth
  4.    Dirty
 Discuss Question
Answer: Option C. -> Clean & smooth
Question 66. In a backward feed multiple effect evaporator
  1.    Feed is introduced in the first effect
  2.    Feed flows from low pressure to high pressure
  3.    No pumps are required between successive effects
  4.    None of these
 Discuss Question
Answer: Option B. -> Feed flows from low pressure to high pressure
Question 67. Which type of heat exchanger is preferred for heavy heat loads?
  1.    Double pipe
  2.    Plate fine
  3.    Series and parallel set of shell and tube
  4.    None of these
 Discuss Question
Answer: Option C. -> Series and parallel set of shell and tube
Question 68. Boiling point elevation of an ideal solution
  1.    Increases rapidly with temperature rise
  2.    Decreases rapidly with temperature rise
  3.    In independent of pressure
  4.    Both B and C
 Discuss Question
Answer: Option A. -> Increases rapidly with temperature rise
Question 69. A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.
  1.    5 minutes
  2.    10 minutes
  3.    20 minutes
  4.    40 minutes
 Discuss Question
Answer: Option A. -> 5 minutes
Question 70. The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is
  1.    2
  2.    1/2
  3.    4
  4.    1/4
 Discuss Question
Answer: Option D. -> 1/4

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