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Chemical Engineering :: Furnace Technology

  1. In order to maintain a reducing atmosphere in a furnace, it should have

  2. A.
    no O2 in flue gas
    B.
    CO in flue gas
    C.
    high excess air
    D.
    none of these

  3. Which is the most thermally efficient furnace ?

  4. A.
    Reheating furnace
    B.
    Reverberatory furnace
    C.
    Rotary kilns
    D.
    Boiler furnace

  5. The heat recoverable from flue gases of furnaces depends on the

  6. A.
    thermal efficiency of furnace.
    B.
    quantity of flue gases.
    C.
    flue gas temperature drop through the furnace.
    D.
    all (a), (b) and (c).

  7. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.

  8. A.
    250
    B.
    650
    C.
    850
    D.
    1000

  9. Which is a continuous furnace ?

  10. A.
    Coke ovens
    B.
    Annealing furnace
    C.
    Glass tank furnace
    D.
    None of these

  11. Which of the following is the most suitable for preheating combustion air above 650°C ?

  12. A.
    Regenerator
    B.
    Metallic recuperator
    C.
    Ceramic recuperator
    D.
    None of these

  13. Soaking pits are meant for heating steel

  14. A.
    ingots
    B.
    coils
    C.
    sheets
    D.
    slabs

  15. The purpose of controlling the furnace atmosphere is to prevent surface attack by

  16. A.
    oxidation/scaling
    B.
    decarburising
    C.
    sulphur penetration
    D.
    either of the above

  17. Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

  18. A.
    20
    B.
    40
    C.
    65
    D.
    80

  19. In producer gas making furnace, steam is added along with air to mainly control the

  20. A.
    fusion of coal ash & clinker formation.
    B.
    C. V. of producer gas.
    C.
    temperature of producer gas.
    D.
    tar content in producer gas.