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Chemical Engineering :: Fuels and Combustion

  1. Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3.

  2. A.
    2
    B.
    4
    C.
    6
    D.
    1

  3. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.

  4. A.
    gaseous
    B.
    solid
    C.
    liquid
    D.
    both (b) and (c)

  5. As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air.

  6. A.
    decreases
    B.
    increases
    C.
    remains same
    D.
    may increase or decrease depending on the type of fuel

  7. Which of the following fuel gases has the highest calorific value ?

  8. A.
    Natural gas.
    B.
    Coal bed methane (CBM).
    C.
    Liquefied petroleum gas (LPG).
    D.
    Sewage gas.

  9. Calorific value as determined by bomb calorimeter is the

  10. A.
    higher calorific value at constant volume.
    B.
    gross calorific value at constant pressure.
    C.
    lower calorific value at constant pressure.
    D.
    net calorific value at constant volume.

  11. Which of the following can be made into briquettes without the use of a binder ?

  12. A.
    lignite
    B.
    Bituminous coal
    C.
    Anthracite coal
    D.
    None of these

  13. As the equilibrium moisture content of the coal increases, its

  14. A.
    calorific value increases.
    B.
    swelling number decreases.
    C.
    swelling number increases.
    D.
    bulk density decreases.

  15. Which of the following is a measure of the agglutinating (i.e., binding) property of coal?

  16. A.
    Thickness of plastic layer
    B.
    Caking index
    C.
    Swelling index
    D.
    Gray-king index

  17. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

  18. A.
    density
    B.
    porosity
    C.
    electrical resistivity
    D.
    none of these

  19. Blast furnace gas burns with a bluish flame, because of the presence of

  20. A.
    CO
    B.
    CH4
    C.
    CO2
    D.
    S