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Total Questions : 1628 | Page 4 of 163 pages
Question 31. Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around
  1.    25 and 60
  2.    3 and 5
  3.    100 and 250
  4.    250 and 600
 Discuss Question
Answer: Option A. -> 25 and 60
Question 32. The units of Young's modulus of elasticity and __________ are the same.
  1.    Strain
  2.    Stress
  3.    Modular ratio
  4.    None of these
 Discuss Question
Answer: Option B. -> Stress
Question 33. In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
  1.    Zig-zag
  2.    Chain
  3.    Diamond
  4.    None of these
 Discuss Question
Answer: Option B. -> Chain
Question 34. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the
  1.    Flow rates of each fluid
  2.    Type and size of packing
  3.    Concentration of each fluid
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 35. Tube height in a calendria type evaporator is normally less than __________ metres.
  1.    1
  2.    2
  3.    3.5
  4.    5.5
 Discuss Question
Answer: Option B. -> 2
Question 36. Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
  1.    Sorel-Lewis method
  2.    McCabe-Thiele's method
  3.    Ponchon-Savarit method
  4.    None of these
 Discuss Question
Answer: Option A. -> Sorel-Lewis method
Question 37. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.
  1.    Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates
  2.    Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap
  3.    Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features
  4.    Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range
 Discuss Question
Answer: Option C. -> Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features
Question 38. Le/D for fully open globe value may be around
  1.    10
  2.    25
  3.    75
  4.    300
 Discuss Question
Answer: Option D. -> 300
Question 39. In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.
  1.    2-3
  2.    5-8
  3.    10-15
  4.    20-25
 Discuss Question
Answer: Option B. -> 5-8
Question 40. __________ shapedroof is the most commonly used roof for cylinderical storage tanks.
  1.    Conical
  2.    Flat
  3.    Dome
  4.    Umbrella
 Discuss Question
Answer: Option A. -> Conical

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