Fuels And Combustion(Chemical Engineering ) Questions and Answers

Question 1. A coal with high __________ content, would ignite most easily.
  1.    Fixed carbon
  2.    Volatile matter
  3.    Ash
  4.    Oxygen
Explanation:-
Answer: Option B. -> Volatile matter
Question 2. Preheating of a gaseous fuel results in increased
  1.    Flame length
  2.    Flame temperature
  3.    Quantity of flue gas
  4.    Ignition temperature
Explanation:-
Answer: Option B. -> Flame temperature
Question 3. The shift conversion reaction taking place during water gas manufacture is given by
  1.    C + H₂O ⟷ CO + H₂
  2.    C + 2H₂O ⟷ CO₂ + 2H₂
  3.    CO + H₂O ⟷ CO₂ + H₂
  4.    None of these
Explanation:-
Answer: Option C. -> CO + H₂O ⟷ CO₂ + H₂
Question 4. Main constituents of purified Lurgi gas are
  1.    H₂, CmHn & CO₂
  2.    CO, H₂ & CH₄
  3.    CO₂, O₂ & CO
  4.    N₂, H₂ & CO₂
Explanation:-
Answer: Option B. -> CO, H₂ & CH₄
Question 5. In high temperature carbonisation (as compared to low temperature carbonisation) of coal
  1.    Coke oven gas yield is more
  2.    Tar yield is less but free carbon in tar is more
  3.    Calorific value of coke oven gas is less
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 6. Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
  1.    1kg mole
  2.    22.4 Nm³
  3.    32 kg
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 7. One kg of carbon for theoretically complete combustion requires __________ kg of air.
  1.    11.5
  2.    0.5
  3.    23
  4.    12
Explanation:-
Answer: Option A. -> 11.5
Question 8. 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
Explanation:-
Answer: Option B. -> Origin of coal
Question 9. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
  1.    Sulphur
  2.    Oxygen
  3.    Hydrogen
  4.    Carbon
Explanation:-
Answer: Option B. -> Oxygen
Question 10. 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
Explanation:-
Answer: Option B. -> CH₄
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