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MCQs

Total Questions : 2441 | Page 24 of 245 pages
Question 231. Combustion reaction of fuels is a/an __________ reaction.
  1.    Auto catalytic
  2.    Exothermic
  3.    Endothermic
  4.    None of these
 Discuss Question
Answer: Option B. -> Exothermic
Question 232. Which of the following has the highest flame velocity?
  1.    H₂
  2.    CO
  3.    CH₄
  4.    C₂H₆
 Discuss Question
Answer: Option A. -> H₂
Question 233. Which of the following gaseous fuels has the lowest calorific value?
  1.    Gobar gas
  2.    Refinery gas
  3.    Converter gas
  4.    Blast furnace gas
 Discuss Question
Answer: Option D. -> Blast furnace gas
Question 234. As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.
  1.    Decreases
  2.    Increases
  3.    Remains same
  4.    May increase or decrease depending on the type of fuel
 Discuss Question
Answer: Option B. -> Increases
Question 235. Which of the following would require least amount of secondary air for combustion?
  1.    Coke breeze containing 25% ash and 2% volatile matter
  2.    Anthracite containing 10% volatile matter and 8% ash
  3.    Bituminous coal containing 20% ash and 25% volatile matter
  4.    Semi-bituminous coal containing 25% ash and 20% volatile matter
 Discuss Question
Answer: Option A. -> Coke breeze containing 25% ash and 2% volatile matter
Question 236. The function of secondary combustion air is to
  1.    Pneumatically convey the pulverised coal
  2.    Completely burn the volatile matter
  3.    Burn the lumpy coal
  4.    None of these
 Discuss Question
Answer: Option B. -> Completely burn the volatile matter
Question 237. KOH solution used in orsat apparatus absorbs
  1.    CO₂
  2.    SO₂
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 238. When the coal is heated in absence of air, it is called its
  1.    Deoxidation
  2.    Gasification
  3.    Coalification
  4.    Carbonisation
 Discuss Question
Answer: Option D. -> Carbonisation
Question 239. During combustion of gaseous fuels, deficiency of air
  1.    Lengthens the flame
  2.    Tends to shorten the flame
  3.    Does not affect the flame length
  4.    Increases the flame temperature
 Discuss Question
Answer: Option A. -> Lengthens the flame
Question 240. Soft coke is not
  1.    Produced by low temperature carbonisation of coal
  2.    A domestic fuel
  3.    Used in blast furnaces
  4.    None of these
 Discuss Question
Answer: Option C. -> Used in blast furnaces

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