πŸ“Š Fuels And Combustion
Q. Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
  • (A) 1000
  • (B) 4000
  • (C) 8000
  • (D) 15000
πŸ’¬ Discuss
βœ… Correct Answer: (C) 8000
πŸ“Š Fuels And Combustion
Q. Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.
  • (A) 6
  • (B) 12
  • (C) 18
  • (D) 24
πŸ’¬ Discuss
βœ… Correct Answer: (D) 24
πŸ“Š Fuels And Combustion
Q. Pick out the wrong statement.
  • (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
  • (B) Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
  • (C) Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (D) None of these
πŸ“Š Fuels And Combustion
Q. Pick out the wrong statement.
  • (A) Cokes of high reactivity are obtained from weakly coking coals
  • (B) Cokes of high reactivity are obtained from strongly coking coals
  • (C) Reactivity of coke is inversely proportional to its absolute density
  • (D) Abrasion index of the coke is a measure of its hardness
πŸ’¬ Discuss
βœ… Correct Answer: (B) Cokes of high reactivity are obtained from strongly coking coals
πŸ“Š Fuels And Combustion
Q. The pyragallol solution used in orsat apparatus can absorb
  • (A) Only O2
  • (B) Both O2 and CO2
  • (C) Both O2 and CO
  • (D) All of the above
πŸ’¬ Discuss
βœ… Correct Answer: (B) Both O2 and CO2
πŸ“Š Fuels And Combustion
Q. Use of preheated air for combustion of fuel in the furnace, increases the
  • (A) Scale losses of the furnace stock
  • (B) Calorific value of the fuel
  • (C) Flame temperature
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (C) Flame temperature
πŸ“Š Fuels And Combustion
Q. C.V. (kcal/Nm3 ) of gaseous fuels __________ with increase in molecular weight.
  • (A) Decreases
  • (B) Increases
  • (C) Remains constant
  • (D) May increase or decrease, depends on combustibles
πŸ’¬ Discuss
βœ… Correct Answer: (D) May increase or decrease, depends on combustibles
πŸ“Š Fuels And Combustion
Q. 'Wobbe index' is a characteristic of
  • (A) Solid fuels
  • (B) Gaseous fuels
  • (C) Liquid fuels
  • (D) Fat coals
πŸ’¬ Discuss
βœ… Correct Answer: (B) Gaseous fuels
πŸ“Š Fuels And Combustion
Q. Volatile matter content of metallurgical coke may be around __________ percent.
  • (A) 1-2
  • (B) 10-15
  • (C) 22-26
  • (D) 30-33
πŸ’¬ Discuss
βœ… Correct Answer: (A) 1-2

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