Fuels and Combustion MCQs with answers Page - 5

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A

Admin • 833K Points
Coach

Q. Combustion of pulverised coal as compared to that of lump coal

  • (A) Provides a lower rate of heat release
  • (B) Can be done with less excess air
  • (C) Develops a low temperature flame
  • (D) Develops a non-luminous flame

A

Admin • 833K Points
Coach

Q. The calorific value of producer gas is around __________ kcal/Nm3.

  • (A) 500
  • (B) 1300
  • (C) 4500
  • (D) 9000

A

Admin • 833K Points
Coach

Q. Yield of pitch from distillation of high temperature tar is around __________ percent.

  • (A) 10
  • (B) 25
  • (C) 65
  • (D) 90

A

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Coach

Q. Supply of excess air for complete combustion of fuel is necessitated to facilitate

  • (A) Its thorough mixing with air
  • (B) Attainment of chemical equilibrium
  • (C) Attainment of high temperature
  • (D) None of these

A

Admin • 833K Points
Coach

Q. In high temperature carbonisation of coal compared to low temperature carbonisation

  • (A) Calorific value of the coke oven gas is lower
  • (B) H2 content in the coke oven gas is more
  • (C) Aromatic content of tar is low
  • (D) Yield of ammonia is less

A

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Coach

Q. Mott and Wheeler test is conducted on coke to find its

  • (A) Reactivity with O2
  • (B) Abradability
  • (C) Volatile matter content
  • (D) Phosphorus content

A

Admin • 833K Points
Coach

Q. Main constituent of natural gas is

  • (A) H2
  • (B) C3H8
  • (C) C2H6
  • (D) CH4 (upto 90%)

A

Admin • 833K Points
Coach

Q. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

  • (A) Back draughting
  • (B) Banking
  • (C) Under pressurising
  • (D) None of these

A

Admin • 833K Points
Coach

Q. Increase in ash content of blast furnace coke

  • (A) Decreases its hardness and abrasion resistance
  • (B) Does not affect its consumption in the furnace
  • (C) Increases its consumption in the furnace
  • (D) Reduces its consumption in the furnace

A

Admin • 833K Points
Coach

Q. Pick out the wrong statement.

  • (A) Main constituents of LPG are propane and butane
  • (B) C.V. of natural gas is about 10000 kcal/Nm3
  • (C) C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)
  • (D) LPG is lighter than air

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