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MCQs

Total Questions : 1628 | Page 163 of 163 pages
Question 1621. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.
  1.    Fixed charges initially
  2.    Running cost of cooling water for condenser
  3.    Running cost of steam for reboiler
  4.    Vapour & liquid load both
 Discuss Question
Answer: Option A. -> Fixed charges initially
Question 1622. Liquid gradient over a tray can be minimised by
  1.    Using split flow, radial flow or cascade flow for column diameter large than 4 ft
  2.    Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must
  3.    Providing a higher skirt clearance or a higher weir
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 1623. Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around
  1.    100 and 250
  2.    3 and 5
  3.    250 and 600
  4.    25 and 60
 Discuss Question
Answer: Option D. -> 25 and 60
Question 1624. Needle valves are generally not used for
  1.    Very large diameter pipes
  2.    Very accurate flow control
  3.    Smaller sizes of pipe
  4.    High pressure throttling service
 Discuss Question
Answer: Option A. -> Very large diameter pipes
Question 1625. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
  1.    Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
  2.    Are less prone to fouling
  3.    None of these
  4.    Are easier to clean
 Discuss Question
Answer: Option A. -> Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
Question 1626. In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
  1.    Diamond
  2.    Chain
  3.    None of these
  4.    Zig-zag
 Discuss Question
Answer: Option B. -> Chain
Question 1627. Tube height in a calendria type evaporator is normally less than __________ metres.
  1.    3.5
  2.    5.5
  3.    1
  4.    2
 Discuss Question
Answer: Option D. -> 2
Question 1628. The units of Young's modulus of elasticity and __________ are the same.
  1.    None of these
  2.    Strain
  3.    Stress
  4.    Modular ratio
 Discuss Question
Answer: Option C. -> Stress

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