Fuels and Combustion MCQs with answers Page - 14

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A

Admin • 833K Points
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Q. Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.

  • (A) H2O
  • (B) CO2
  • (C) CO
  • (D) CH4

A

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Q. The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

  • (A) Much higher
  • (B) Much lower
  • (C) Same
  • (D) Either lower or higher, depends on the type of fuel

A

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Q. L.D. converter gas (produced in steel plant) comprises mainly of

  • (A) CO (upto 65%) & CO2
  • (B) CO2 & H2
  • (C) CO & O2
  • (D) CO2 & O2

A

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Q. Which of the following fuel gases is heavier than air?

  • (A) Water gas
  • (B) Natural gas
  • (C) Blast furnace gas
  • (D) Coke oven gas

A

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Q. Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

  • (A) 80 and 97
  • (B) 95 and 100
  • (C) 40 and 70
  • (D) 25 and 97

A

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Q. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

  • (A) Higher calorific value
  • (B) Lower hydrogen content
  • (C) Both A & B
  • (D) Neither A nor B

A

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Q. As the equilibrium moisture content of the coal increases, its

  • (A) Calorific value increases
  • (B) Swelling number decreases
  • (C) Swelling number increases
  • (D) Bulk density decreases

A

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Q. Coke made in narrower by-product coke ovens (as compared to wider ovens) is

  • (A) Less reactive
  • (B) Stronger
  • (C) Smaller in size
  • (D) All of the above

A

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Q. Ammonia content in raw coke oven gas is about __________ gm/Nm3.

  • (A) 1
  • (B) 15
  • (C) 50
  • (D) 100

A

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Q. Fusion point of coal ash increases with increase in its __________ content.

  • (A) Iron sulphate
  • (B) Iron silicate
  • (C) Lime and magnesia
  • (D) All of the above

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