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MCQs

Total Questions : 2441 | Page 29 of 245 pages
Question 281. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
  1.    Gaseous
  2.    Solid
  3.    Liquid
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 282. Air/gas ratio for complete combustion will be the highest for
  1.    LPG
  2.    Gobar gas
  3.    Coke oven gas
  4.    Carburetted water gas
 Discuss Question
Answer: Option A. -> LPG
Question 283. Which of the following coal gasification processes will produce gas having maximum methane content?
  1.    Winkler process
  2.    Lurgi process
  3.    Kopper-Totzek process
  4.    All of the above
 Discuss Question
Answer: Option B. -> Lurgi process
Question 284. Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
  1.    4
  2.    96
  3.    20
  4.    40
 Discuss Question
Answer: Option C. -> 20
Question 285. Washing of coal
  1.    Reduces its sulphur and ash content
  2.    Controls its ash fusibility and increases its calorific value
  3.    Improves its coking properties
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 286. Washing of coal
  1.    Reduces its ash & sulphur content
  2.    Improves its coking properties
  3.    Increase the fusion point of its ash by removing chlorine compounds
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 287. Washing of coal decreases its
  1.    Caking index
  2.    Mineral matter content
  3.    Ash content
  4.    Both B and C
 Discuss Question
Answer: Option B. -> Mineral matter content
Question 288. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
  1.    Propane and acetylene
  2.    Propane and LPG
  3.    Sewage gas and gobar gas
  4.    B.F. gas and coke oven gas
 Discuss Question
Answer: Option A. -> Propane and acetylene
Question 289. Low temperature oxidation of stored coal results in the
  1.    Decrease in its caking power & calorific value
  2.    Decrease in its carbon & hydrogen content
  3.    Increase in its oxygen content
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 290. Adiabatic flame temperature of a fuel is dependent on the initial temperature of
  1.    Fuel
  2.    Air
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B

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