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MCQs

Total Questions : 1628 | Page 17 of 163 pages
Question 161. Safety valves are provided in chemical equipments to guard against excessive
  1.    Temperature
  2.    Pressure/pressure fluctuation
  3.    Turbulence
  4.    Noise
 Discuss Question
Answer: Option B. -> Pressure/pressure fluctuation
Question 162. The stress developed in a material without any permanent set is called the
  1.    Ultimate stress
  2.    Yield stress
  3.    Elastic limit
  4.    Breaking stress
 Discuss Question
Answer: Option C. -> Elastic limit
Question 163. Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).
  1.    250
  2.    450
  3.    650
  4.    750
 Discuss Question
Answer: Option C. -> 650
Question 164. In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.
  1.    0.5 to 1.5
  2.    2.5 to 4.0
  3.    5 to 10
  4.    10 to 15
 Discuss Question
Answer: Option B. -> 2.5 to 4.0
Question 165. A claming section before the liquid flows into the downcomer is privided to
  1.    Permit release of entrained vapour in the liquid
  2.    Reduce the discharge fluctuation
  3.    Ensure better vapour-liquid contact
  4.    Cool the liquid before it flows down
 Discuss Question
Answer: Option A. -> Permit release of entrained vapour in the liquid
Question 166. The function of manholes provided in the shell of a distillation column is to
  1.    Keep a check on the liquid gradient over the plate by direct visual observation
  2.    Give access to the individual trays for cleaning, maintenance and installation
  3.    Guard against foaming & entrainment by dumping antifoaming agent through it
  4.    All of the above
 Discuss Question
Answer: Option B. -> Give access to the individual trays for cleaning, maintenance and installation
Question 167. In the agitators, the power required will be changed with the increase of diameter of agitator (D) as
  1.    D²
  2.    D⁵
  3.    D
  4.    D⁹
 Discuss Question
Answer: Option B. -> D⁵
Question 168. Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is
  1.    More
  2.    Same
  3.    Less
  4.    Twice
 Discuss Question
Answer: Option C. -> Less
Question 169. Pick out the wrong statement.
  1.    If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour
  2.    The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding
  3.    The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 170. Fresh water carrying pipelines in chemical industries are coloured with __________ color.
  1.    Sea green
  2.    Brown
  3.    Yellow
  4.    Red
 Discuss Question
Answer: Option A. -> Sea green

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