Fuels and Combustion MCQs with answers Page - 9

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A

Admin • 833K Points
Coach

Q. Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?

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

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Q. Tar is a better fuel than furnace oil, because of its

  • (A) Higher calorific value
  • (B) Lower sulphur content
  • (C) Higher emissivity (0.8 - 0.9) resulting in higher radiation heat transfer rate
  • (D) Both A & B

A

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Q. When incomplete combustion loss is high, the flue gas analysis shows large amount of

  • (A) CO2
  • (B) CO
  • (C) O2
  • (D) C

A

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Q. Pick out the wrong statement.

  • (A) Percentage of ash in coke produced from medium coking coal is more than that in coal
  • (B) The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it by cryogenic method
  • (C) Ash is normally removed as
  • (D) Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P.) employ Kopper-Totzek process of coal gasification

A

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Q. Low temperature carbonisation of coal takes place at __________ °C.

  • (A) 150
  • (B) 300
  • (C) 700
  • (D) 1100

A

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Q. High temperature carbonisation of coal takes place at __________ °C.

  • (A) 600
  • (B) 1100
  • (C) 1600
  • (D) 2000

A

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Q. Actual flame temperature is always lower than the adiabatic flame temperature, because there is

  • (A) No possibility of obtaining complete combustion at high temperature
  • (B) Always loss of heat from the flame
  • (C) Both A & B
  • (D) Neither A nor B

A

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Q. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

  • (A) 1
  • (B) < 1
  • (C) > 1
  • (D) Unpredicatable

A

Admin • 833K Points
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Q. A coal containing very high percentage of durain is called __________ coal.

  • (A) Bright
  • (B) Splint
  • (C) Non-banded
  • (D) Boghead

A

Admin • 833K Points
Coach

Q. Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

  • (A) 0.5
  • (B) 2.5
  • (C) 10
  • (D) 20

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