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 on Bissoy. Bissoy App

• 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
• 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
• 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
• The weathering index of a coal
  ক

  Gives an idea of the fusion temperature of ash

  খ

  Is related to its calorific value

  গ

  Is a measure of its size stability, when stored & exposed to weather

  ঘ

  Is a measure of its caking tendency
• The fuel ratio of a coal is
  ক

  The ratio of its percentage of fixed carbon to that of volatile matter

  খ

  Helpful in estimation of its rank

  গ

  Both A and B

  ঘ

  Neither A nor B
• The hottest part of the flame lies in its____zone.
  ক

  Non-luminous

  খ

  Luminous

  গ

  Yellow

  ঘ

  Unburnt gases
• Out of the following, which is the most important parameter for the blast furnace grade coke?
  ক

  CSR & CRI

  খ

  Ash content

  গ

  Moisture content

  ঘ

  Volatile matter content
• A fuel with high heat release rate will
  ক

  Require smaller combustion chamber

  খ

  Have high calorific value

  গ

  Have high adiabatic flame temperature

  ঘ

  None of these