Fuels and Combustion MCQs with answers Page - 15

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Admin • 833K Points
Coach

Q. A coal with high ash content is undesirable, as

  • (A) It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber
  • (B) The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash
  • (C) The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer
  • (D) All of the above

A

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Q. Fuel for a fast breeder nuclear reactor is

  • (A) Plutonium
  • (B) Uranium
  • (C) Radium
  • (D) Neptunium

A

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Q. Stack heat losses can be minimised by

  • (A) Using low c.v. fuels
  • (B) Controlling the excess air
  • (C) Oxygen enrichment of combustion air
  • (D) Maintaining proper draft in the furnace

A

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Q. The gas which contributes maximum to the heating value of natural gas is

  • (A) CO
  • (B) CO2
  • (C) H2
  • (D) CH4

A

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Q. Natural draft created by the chimney depends upon

  • (A) Temperature of the flue gas
  • (B) Its height
  • (C) Both A & B
  • (D) Neither A nor B

A

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Q. The cooling medium used in dry quenching of coke is

  • (A) Carbon dioxide
  • (B) Nitrogen
  • (C) Air
  • (D) Phenolic water

A

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Q. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

  • (A) 400-500
  • (B) 900-1000
  • (C) 1400-1500
  • (D) 1700-1800

A

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Q. Water gas constitutes mainly of

  • (A) CO & H2
  • (B) CO & N2
  • (C) CO2 & H2
  • (D) CH4 & H2

A

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Q. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be

  • (A) High
  • (B) Low
  • (C) Very high, if the fuel is of low calorific value
  • (D) None of these

A

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Q. C/H ratio is the maximum in case of

  • (A) Coal
  • (B) Furnace oil
  • (C) Natural gas
  • (D) Naphtha

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