Fuels and Combustion MCQs with answers Page - 3

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A

Admin • 802.91K Points
Coach

Q. Calorific value of bituminous coal may be around __________ Kcal/kg.

  • (A) 500
  • (B) 1500
  • (C) 6500
  • (D) 20000

A

Admin • 802.91K Points
Coach

Q. Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

  • (A) 1000
  • (B) 4000
  • (C) 8000
  • (D) 15000

A

Admin • 802.91K Points
Coach

Q. Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

  • (A) 6
  • (B) 12
  • (C) 18
  • (D) 24

A

Admin • 802.91K Points
Coach

Q. Pick out the wrong statement.

  • (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
  • (B) Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
  • (C) Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
  • (D) None of these

A

Admin • 802.91K Points
Coach

Q. Pick out the wrong statement.

  • (A) Cokes of high reactivity are obtained from weakly coking coals
  • (B) Cokes of high reactivity are obtained from strongly coking coals
  • (C) Reactivity of coke is inversely proportional to its absolute density
  • (D) Abrasion index of the coke is a measure of its hardness

A

Admin • 802.91K Points
Coach

Q. The pyragallol solution used in orsat apparatus can absorb

  • (A) Only O2
  • (B) Both O2 and CO2
  • (C) Both O2 and CO
  • (D) All of the above

A

Admin • 802.91K Points
Coach

Q. Use of preheated air for combustion of fuel in the furnace, increases the

  • (A) Scale losses of the furnace stock
  • (B) Calorific value of the fuel
  • (C) Flame temperature
  • (D) None of these

A

Admin • 802.91K Points
Coach

Q. C.V. (kcal/Nm3 ) of gaseous fuels __________ with increase in molecular weight.

  • (A) Decreases
  • (B) Increases
  • (C) Remains constant
  • (D) May increase or decrease, depends on combustibles

A

Admin • 802.91K Points
Coach

Q. Volatile matter content of metallurgical coke may be around __________ percent.

  • (A) 1-2
  • (B) 10-15
  • (C) 22-26
  • (D) 30-33

A

Admin • 802.91K Points
Coach

Q. Which of the following is not a binder for coal briquetting?

  • (A) Coal tar
  • (B) Bitumen
  • (C) Molasses
  • (D) None of these

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