Fuels and Combustion MCQs with answers Page - 10

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Q. The reaction, C + CO2 ⟷ 2CO, taking place during coal gasification is called the __________ reaction.

  • (A) Neumann reversal
  • (B) Shift conversion
  • (C) Boudouard
  • (D) Reduction

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Q. Sometimes water is sprayed during coal charging in the coke oven, which helps in

  • (A) Prevention of clinker formation in the oven
  • (B) Controlling the dust nuisance while charging the coal
  • (C) Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)
  • (D) All of the above

A

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Q. The main drawback of supplying more excess air in the combustion of fuel is the

  • (A) Excessive power requirement of air blower
  • (B) Enhanced sensible heat loss in the flue gas
  • (C) Intermittant and uncontrolled combustion of the fuel
  • (D) High exit flue gas temperature from the furnace

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Q. Which of the following fuel gases has the highest calorific value?

  • (A) Natural gas
  • (B) Coal bed methane (CBM)
  • (C) Liquefied petroleum gas (LPG)
  • (D) Sewage gas

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Q. Which of the following has the highest calorific value?

  • (A) Lignite
  • (B) Anthracite
  • (C) Peat
  • (D) Sub-bituminous coal

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Q. Which of the following coke has the least percentage of ash?

  • (A) Petroleum coke
  • (B) Beehive coke
  • (C) Foundary coke
  • (D) Metallurgical coke

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Q. Dust content in raw blast furnace gas is about __________ gm/Nm3, hence it is cleaned to the dust level of about < 10 mg/Nm3 before use.

  • (A) 1 - 2
  • (B) 15 - 30
  • (C) 70 - 100
  • (D) 150 - 200

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Q. Coke oven gas is a better fuel than blast furnace gas, because of its higher

  • (A) Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
  • (B) Adiabatic flame temperature
  • (C) Heat release rate (thus requiring smaller combustion chamber)
  • (D) All of the above

A

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Q. The main advantage of forced draft over natural draft is that

  • (A) Furnace control is easier
  • (B) Combustion of fuel is complete
  • (C) Smaller height chimney can be used
  • (D) All of the above

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Q. A particular coal is said to be free burning when it

  • (A) Shows little or no fusing action
  • (B) Burns completely
  • (C) Gives smokeless burning
  • (D) None of these

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