Fuels and Combustion MCQs with answers Page - 11

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Q. Main constituents of benzol are

  • (A) Anthracene & phenol
  • (B) Benzene, toluene & xylene
  • (C) Tar & creosote
  • (D) Ammonia & phenol

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Q. Which will have the least volatile matter and hence will be the most difficult to ignite?

  • (A) Bituminous coal
  • (B) Coke
  • (C) Semi-bituminous coal
  • (D) Aanthracite

A

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Q. Ratio of primary air to secondary air increases with increase in the rank of coal, because the

  • (A) Calorific value of the coal increases
  • (B) Oxygen content progressively decreases
  • (C) Ratio of fixed carbon to volatile matter increases
  • (D) High rank coals have higher amount of volatile matter

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Q. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

  • (A) Tar
  • (B) Coke oven gas
  • (C) Pitch
  • (D) Pulverised coke

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Q. Oxygen percentage (by weight) in atmospheric air is

  • (A) 19
  • (B) 21
  • (C) 23
  • (D) 29

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Q. Artificial draught produced by a fan can be controlled by the

  • (A) Speed of the fan
  • (B) Damper
  • (C) Variation in the pitch of the fan blades
  • (D) All of the above

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Q. A good metallurgical coke

  • (A) Should have high porosity
  • (B) Should be brittle
  • (C) Must contain moderate quantities of ash, moisture, sulphur and volatile matters
  • (D) Should have low fusion point of its ash

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Q. Fuel for a nuclear reactor (thermal) is

  • (A) Radium
  • (B) Uranium
  • (C) Plutonium
  • (D) None of these

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Q. Very __________ coals are completely devoid of cokability i.e, it is non coking.

  • (A) Young
  • (B) Mature
  • (C) Both A & B
  • (D) Neither A nor B

A

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Q. Which of the following can be made into briquettes without the use of a binder?

  • (A) Lignite
  • (B) Bituminous coal
  • (C) Anthracite coal
  • (D) None of these

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