Fuels and Combustion MCQs with answers Page - 2

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A

Admin • 833K Points
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Q. Which of the following combustibles is absent in blast furnace gas?

  • (A) H2
  • (B) CH4
  • (C) CO
  • (D) None of these

A

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Q. Which of the following would require maximum amount of % excess air for complete combustion?

  • (A) Coke oven gas
  • (B) Furnace oil
  • (C) Pulverised coal
  • (D) Lump coal (fixed on chain grate)

A

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Q. Calorific value of gobar gas (containing CH4 = 60%, H2 = 10%, CO2 = 30%) may be about __________ Kcal/Nm3 .

  • (A) 1800
  • (B) 3200
  • (C) 5400
  • (D) 10200

A

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Q. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

  • (A) 1000
  • (B) 4000
  • (C) 6000
  • (D) 8000

A

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Q. If oxygen content in the flue gas rises too high, fuel is being wasted by

  • (A) Incomplete combustion
  • (B) Dry gas/stack gas loss
  • (C) Moisture loss
  • (D) None of these

A

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Q. Coking time in beehive coke oven is about

  • (A) 12 hours
  • (B) 2-3 days
  • (C) One week
  • (D) Two weeks

A

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Q. Too much of excess air in combustion results in high

  • (A) Percentage of oxygen in flue gases
  • (B) Fuel consumption for the same heat load
  • (C) Stack gas temperature
  • (D) All of the above

A

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Q. Catalyst used in Fischer-Tropsch process is

Code:
  • (A) Nickel
  • (B) Zinc oxide
  • (C) Alumina
  • (D) Thorium oxide

A

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Q. The cuprous chloride used in orsat apparatus can absorb

  • (A) Only CO
  • (B) Both CO and CO2
  • (C) Both CO and O2
  • (D) All of the above

A

Admin • 833K Points
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Q. Calorific value of dry wood may be around __________ Kcal/kg.

  • (A) 5
  • (B) 50
  • (C) 500
  • (D) 5000

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