Fuels and Combustion MCQ

Test your knowledge with important Fuels and Combustion MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Fuels and Combustion MCQs at Bissoy

• Efficiency of the combustion of a fuel is judged by the __________ the flue gas.
  ক

  % of CO₂ in

  খ

  % of O₂ in

  গ

  Temperature of

  ঘ

  Colour of
• Gobar gas is produced by the __________ of cown dung.
  ক

  Fermentation

  খ

  Oxidation

  গ

  Hydrogenation

  ঘ

  None of these
• Dry air required to burn 1 kg of carbon completely may be around __________ kg.
  ক

  11

  খ

  2

  গ

  20

  ঘ

  38
• Volatile matter content in coking coal may be about __________ percent.
  ক

  1

  খ

  7

  গ

  22

  ঘ

  46
• Carbon Content by weight in air dried wood may be about __________ percent.
  ক

  10

  খ

  25

  গ

  50

  ঘ

  80
• For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³), while the C.V. is same on weight basis (i.e., kcal/kg)?
  ক

  Propane and acetylene

  খ

  Propane and LPG

  গ

  Sewage gas and gobar gas

  ঘ

  B.F. gas and coke oven gas
• Washing of coal decreases its
  ক

  Caking index

  খ

  Mineral matter content

  গ

  Ash content

  ঘ

  Both B and C
• Washing of coal
  ক

  Reduces its sulphur and ash content

  খ

  Controls its ash fusibility and increases its calorific value

  গ

  Improves its coking properties

  ঘ

  All of the above
• Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
  ক

  4

  খ

  96

  গ

  20

  ঘ

  40
• Which of the following coal gasification processes will produce gas having maximum methane content?
  ক

  Winkler process

  খ

  Lurgi process

  গ

  Kopper-Totzek process

  ঘ

  All of the above
• Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
  ক

  Gaseous

  খ

  Solid

  গ

  Liquid

  ঘ

  Both B and C
• Air/gas ratio for complete combustion will be the highest for
  ক

  LPG

  খ

  Gobar gas

  গ

  Coke oven gas

  ঘ

  Carburetted water gas
• Presence of nitrogen in combustion air does not reduce the
  ক

  Amount of heat liberated

  খ

  Flame temperature

  গ

  Flue gas temperature

  ঘ

  Any of the above
• A gaseous fuel in order to develop luminousity on burning, must contain
  ক

  Carbon monoxide

  খ

  Hydrocarbons

  গ

  Hydrogen

  ঘ

  Oxygen
• In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
  ক

  CO

  খ

  CO₂

  গ

  O₂

  ঘ

  H₂O
• Which of the following fuels is the best for burning on chain grate stoker?
  ক

  Non-caking coal

  খ

  Caking coal

  গ

  Coking coal

  ঘ

  Pulverised coal
• Softening temperature of coal ash is a measure of the __________ of coal.
  ক

  Caking tendency

  খ

  Coking tendency

  গ

  Clinkering tendency

  ঘ

  Size stability
• In low temperature carbonisation of coal, the
  ক

  Yield of coke oven gas is 290 Nm³/ton dry coal

  খ

  Volatile matter in coke is zero

  গ

  Temperature maintained is 700°C

  ঘ

  Yield of tar is about 3% of dry coal
• By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of
  ক

  Tar

  খ

  Benzol

  গ

  Ammonia

  ঘ

  None of these
• Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
  ক

  Calorific value

  খ

  Higher C/H ratio

  গ

  Sulphur content

  ঘ

  Difference in gross & net calorific value
• Which is the heaviest fuel gas out of the following?
  ক

  Blast furnace gas

  খ

  Coke oven gas

  গ

  Water gas

  ঘ

  Carburetted water gas
• Main constituent of the gas produced from a gobar gas plant is
  ক

  CO₂

  খ

  CH₄

  গ

  H₂

  ঘ

  CO
• Moisture loss is determined by the
  ক

  Humidity of combustion air

  খ

  Moisture content of fuel

  গ

  Both A and B

  ঘ

  The water formed by combustion reaction
• Power alcohol as compared to straight run gasoline has lower
  ক

  Calorific value

  খ

  Octane number

  গ

  Specific gravity

  ঘ

  Viscosity
• Gross calorific value will be equal to the net calorific value for
  ক

  H₂

  খ

  C₂H₂

  গ

  CO

  ঘ

  C₂H₆
• A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
  ক

  More

  খ

  Less

  গ

  Same

  ঘ

  Data insufficient; can't be predicted
• Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?
  ক

  Ammonium sulphate

  খ

  Ammonium nitrate

  গ

  Ammonium phosphate

  ঘ

  None of these
• A coal having higher volatile matter content, has lower
  ক

  Smoking tendency on burning

  খ

  Coke oven gas yield on carbonisation

  গ

  Chance of catching fire during storage in open space

  ঘ

  Ignition temperature
• Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
  ক

  230 V AC

  খ

  60 KV AC

  গ

  230 V DC

  ঘ

  60 KV DC
• Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?
  ক

  50

  খ

  70

  গ

  85

  ঘ

  100