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Total Questions : 2441 | Page 3 of 245 pages
Question 21. In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by
  1.    Potassium hydroxide
  2.    Dilute potassium carbonate
  3.    Cuporus chloride
  4.    Alkaline pyragllol solution
 Discuss Question
Answer: Option A. -> Potassium hydroxide
Question 22. Fuel consumption in coke making can be reduced by
  1.    Preheating, blending and de-ashing the coal
  2.    Stamped charging of coal
  3.    Dry quenching of coke
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 23. For maximum discharge through a chimney, its height should be
  1.    200 meters
  2.    Infinitely long
  3.    More than 105.7 metres
  4.    Equal to the height of the hot gas column producing draught
 Discuss Question
Answer: Option D. -> Equal to the height of the hot gas column producing draught
Question 24. Blast furnace gas compared to coke oven gas has
  1.    Lower ignition temperature
  2.    Narrower limit of inflammability
  3.    Higher calorific value
  4.    Lower theoretical flame temperature
 Discuss Question
Answer: Option D. -> Lower theoretical flame temperature
Question 25. Combustion of pulverised coal as compared to that of lump coal
  1.    Develops a non-luminous flame
  2.    Develops a low temperature flame
  3.    Can be done with less excess air
  4.    Provides a lower rate of heat release
 Discuss Question
Answer: Option C. -> Can be done with less excess air
Question 26. Mott and Wheeler test is conducted on coke to find its
  1.    Reactivity with O₂
  2.    Abradability
  3.    Phosphorus content
  4.    Volatile matter content
 Discuss Question
Answer: Option A. -> Reactivity with O₂
Question 27. Main constituent of natural gas is
  1.    CH₄ (upto 90%)
  2.    C₂H₆
  3.    C₃H₈
  4.    H₂
 Discuss Question
Answer: Option A. -> CH₄ (upto 90%)
Question 28. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
  1.    Back draughting
  2.    Banking
  3.    Under pressurising
  4.    None of these
 Discuss Question
Answer: Option B. -> Banking
Question 29. Increase in ash content of blast furnace coke
  1.    Reduces its consumption in the furnace
  2.    Increases its consumption in the furnace
  3.    Does not affect its consumption in the furnace
  4.    Decreases its hardness and abrasion resistance
 Discuss Question
Answer: Option B. -> Increases its consumption in the furnace
Question 30. Pick out the wrong statement.
  1.    Main constituents of LPG are propane and butane
  2.    C.V. of natural gas is about 10000 KCal/Nm³
  3.    C.V. of LPG is about 26000 kcal/Nm³(11500 kcal/kg)
  4.    L.P.G. is lighter than air
 Discuss Question
Answer: Option D. -> L.P.G. is lighter than air

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