Fuels and Combustion MCQs with answers Page - 18

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A

Admin • 833K Points
Coach

Q. For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

  • (A) 0.1
  • (B) 2
  • (C) 5
  • (D) 10

A

Admin • 833K Points
Coach

Q. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

  • (A) 70
  • (B) 85
  • (C) 105
  • (D) 145

A

Admin • 833K Points
Coach

Q. Fixed carbon in coal is defined as

  • (A) That present in volatile matters
  • (B) The total quantity of carbon present in the coal
  • (C) Hundred minus the percentage of volatile matter, ash and moisture
  • (D) The one which is present in the residue after combustion

A

Admin • 833K Points
Coach

Q. The most matured coal out of the following is

  • (A) Lignite
  • (B) Semi-anthracite
  • (C) Sub-bituminous
  • (D) Bituminous

A

Admin • 833K Points
Coach

Q. Yield of charcoal in high temperature carbonisation of wood is about __________ percent.

  • (A) 10
  • (B) 25
  • (C) 50
  • (D) 75

A

Admin • 833K Points
Coach

Q. Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

  • (A) 50
  • (B) 1000
  • (C) 5000
  • (D) 10000

A

Admin • 833K Points
Coach

Q. Caking coal is desirable for

  • (A) Burning on travelling grate
  • (B) Coke making
  • (C) Burning on firebars
  • (D) All of the above

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Admin • 833K Points
Coach

Q. When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the __________ of coal.

  • (A) Carbonisation
  • (B) Oxidation
  • (C) Coalification
  • (D) Gasification

A

Admin • 833K Points
Coach

Q. Calorific value of

  • (A) Light paraffinic fuel oils is equal to that of equivalent olefins
  • (B) N-paraffin is lower than that of iso-paraffins of the same compounds
  • (C) Light paraffinic fuel oils is higher than that of equivalent olefins
  • (D) Light paraffinic fuel oils is lower than that of equivalent olefins

A

Admin • 833K Points
Coach

Q. Use of excess of combustion air in the combustion of fuels results in

  • (A) Heat losses
  • (B) Long flame
  • (C) Condensation of water vapour from the fuel gas
  • (D) None of these

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