Fuels and Combustion MCQs with answers Page - 17

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Q. While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at

  • (A) Dankuni (West Bengal)
  • (B) Dhanbad
  • (C) Singreni (A.P.)
  • (D) Raniganj

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Q. The maximum adiabatic flame temperature is attained, when the fuel is burnt with

  • (A) Theoretically required amount of oxygen
  • (B) Less than theoretically required amount of air
  • (C) More than theoretically required amount of air
  • (D) Theoretically required amount of air

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Q. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

  • (A) Large heaps with small surface to volume ratio
  • (B) Closed space without any ventilation facility
  • (C) Fine sizes without the presence of any lump
  • (D) Shallow and small piles

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Q. Which of the following is not applicable to fluidised bed combustion of coal?

  • (A) Less heat transfer surface area is required in boilers
  • (B) It can not burn low grade coal
  • (C) It achieves higher fuel combustion efficiency
  • (D) None of these

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Q. Size of blast furnace grade coke is __________ mm.

  • (A) 0-15
  • (B) 15-25
  • (C) 25-80
  • (D) >100

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Q. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

  • (A) The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
  • (B) It reduces its calorific value tremendously
  • (C) It reduces its flame temperature tremendously
  • (D) There are chances of explosion during preheating

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Q. Pick out the wrong statement.

  • (A) LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals
  • (B) The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point
  • (C) Each ton of petroleum oil on distillation produces about 30 - 50 Nm3 of gas
  • (D) Maximum yield of naphthalene is obtained on distillation of crude oil

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Q. Benzene is used

  • (A) As a motor fuel
  • (B) As an explosive
  • (C) For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)
  • (D) As a perfume

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Q. Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

  • (A) Electrode manufacture
  • (B) Absorption of gases and vapor
  • (C) Solvent recovery from air and gases
  • (D) Decolourisation of sugar

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Q. Bright coal

  • (A) Contains more than 90% durain
  • (B) Contains more than 90% fussain
  • (C) Is non-coking
  • (D) Contains mainly vitrain & clarain and is generally coking

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