Fuels and Combustion MCQs with answers Page - 1

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A

Admin • 799.53K Points
Coach

Q. Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.

  • (A) CO content
  • (B) Dew point
  • (C) CO2 content
  • (D) O2 content

A

Admin • 799.53K Points
Coach

Q. High sulphur content in a fuel __________ of the flue gases.

  • (A) Decreases the dew point
  • (B) Increases the dew point
  • (C) Reduces the combustion efficiency by limiting the permissible temperature reduction
  • (D) Both B & C

A

Admin • 799.53K Points
Coach

Q. Fusion point of coal ash generally varies from 1000 to 1700°C. Ash having fusion point less than __________ °C is liable to form clinker.

  • (A) 1100
  • (B) 1250
  • (C) 1350
  • (D) 1400

A

Admin • 799.53K Points
Coach

Q. Coal tar fuel - 200 (CTF 200) is a mixture of

  • (A) Pitch and creosote oil
  • (B) Light oil and pitch
  • (C) Anthracene and crecosote oil
  • (D) Solar oil and pitch

A

Admin • 799.53K Points
Coach

Q. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.

  • (A) Fluidised
  • (B) Fixed
  • (C) Moving
  • (D) Entrained

A

Admin • 799.53K Points
Coach

Q. During combustion of coal on grate, clinker formation is increased by the

  • (A) Use of thick fire bed
  • (B) Low fusion point of ash (< 1100°C)
  • (C) Use of preheated primary air
  • (D) All of the above

A

Admin • 799.53K Points
Coach

Q. A good quality coal should have

  • (A) Low fusion point of ash
  • (B) High ash content
  • (C) High sulphur
  • (D) None of these

A

Admin • 799.53K Points
Coach

Q. Coke oven gas is stripped of its H2 S and mercaptans content by

  • (A) Absorption in wash oil
  • (B) Adsorption on bog iron bed
  • (C) Bubbling it through dilute sulphuric acid
  • (D) Adsorption on silica gel

A

Admin • 799.53K Points
Coach

Q. Which of the following has the highest flame speed?

  • (A) CO
  • (B) H2
  • (C) CH4
  • (D) C2 H6

A

Admin • 799.53K Points
Coach

Q. A good coking coal should have high __________ content.

  • (A) Ash
  • (B) Sulphur & phosphorus
  • (C) Moisture
  • (D) None of these

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