Fuels and Combustion MCQs with answers Page - 13

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A

Admin • 833K Points
Coach

Q. Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).

  • (A) 150
  • (B) 1500
  • (C) 3500
  • (D) 5000

A

Admin • 833K Points
Coach

Q. Coal containing large quantity of __________ are difficult to wash.

  • (A) Ash
  • (B) Inherent mineral matter
  • (C) Free impurities
  • (D) Volatile matter

A

Admin • 833K Points
Coach

Q. Preheating of __________ the flame temperature.

  • (A) The gaseous fuel before combustion decreases
  • (B) Combustion air decreases
  • (C) Either the fuel or the air or both, increases
  • (D) Either the fuel or the air does not affect

A

Admin • 833K Points
Coach

Q. Gross heating value of coal is __________ the net heating value.

  • (A) Higher than
  • (B) Lower than
  • (C) Same as
  • (D) None of these

A

Admin • 833K Points
Coach

Q. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3/ton of dry coal.

  • (A) 60
  • (B) 160
  • (C) 500
  • (D) 750

A

Admin • 833K Points
Coach

Q. Yield of blast furnace gas is about __________ Nm3/ton of pig iron.

  • (A) 300
  • (B) 2000
  • (C) 5000
  • (D) 10000

A

Admin • 833K Points
Coach

Q. Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.

  • (A) Colour
  • (B) Moisture content
  • (C) Ash content
  • (D) Volatile matter

A

Admin • 833K Points
Coach

Q. Anthracite can be used for

  • (A) Recarbonising steel
  • (B) Making carbon electrodes
  • (C) Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
  • (D) All of the above

A

Admin • 833K Points
Coach

Q. Anthracite coal

  • (A) Burns with short, bluish, yellow-tipped flame producing very little smoke
  • (B) Contains more volatile matter than bituminous coal
  • (C) Ignites more easily than bituminous coal
  • (D) Is essentially a coking coal

A

Admin • 833K Points
Coach

Q. Ignition temperature decreases progressively from anthracite to lignite, because

  • (A) Volatile matter content increases
  • (B) Carbon content decreases
  • (C) Moisture content increases
  • (D) Ash content increases

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