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MCQs

Total Questions : 2441 | Page 23 of 245 pages
Question 221. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
  1.    Sulphur
  2.    Oxygen
  3.    Hydrogen
  4.    Carbon
 Discuss Question
Answer: Option B. -> Oxygen
Question 222. Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
  1.    H₂
  2.    CH₄
  3.    CO₂
  4.    N₂
 Discuss Question
Answer: Option B. -> CH₄
Question 223. Insitu theory and drift theory are related to the
  1.    Origin of petroleum oil
  2.    Origin of coal
  3.    Coalification
  4.    Variation of coal quality with depth
 Discuss Question
Answer: Option B. -> Origin of coal
Question 224. During the carbonisation of coal
  1.    All tar is evolved at < 600°C
  2.    Evolution of H₂ and formation of methane and aromatics occur at > 700°C
  3.    Hard semi-coke starts shrinking at 600°C
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 225. Ultimate analysis of coal determines its __________ content.
  1.    Carbon, hydrogen, nitrogen & sulphur
  2.    Carbon, ash, sulphur & nitrogen
  3.    Carbon, sulphur, volatile matter & ash
  4.    Carbon, volatile matter, ash & moisture
 Discuss Question
Answer: Option A. -> Carbon, hydrogen, nitrogen & sulphur
Question 226. Proximate analysis of coal determines its __________ content.
  1.    Moisture, ash, sulphur & volatile matter
  2.    Moisture, volatile matter, ash & fixed carbon
  3.    Moisture, sulphur, nitrogen & fixed carbon
  4.    None of these
 Discuss Question
Answer: Option B. -> Moisture, volatile matter, ash & fixed carbon
Question 227. Which of the following is not a micro component present in coal?
  1.    Micrinite
  2.    Clarain
  3.    Fusinite
  4.    Liptinite
 Discuss Question
Answer: Option B. -> Clarain
Question 228. Narrow coke ovens as compared to wider coke ovens
  1.    Produce smaller coke
  2.    Produce stronger coke
  3.    Require less time of carbonisation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 229. With increases in carbonisation temperature
  1.    Coke even gas yield increases
  2.    Tar yield increases
  3.    Hydrogen percentage in the coke oven gas decreases
  4.    Methane percentage in the coke oven gas increases
 Discuss Question
Answer: Option A. -> Coke even gas yield increases
Question 230. Coke ovens in steel plant are heated by
  1.    Electricity
  2.    Coke oven gas
  3.    Mixed gas
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C

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