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Chemical Engineering :: Furnace Technology

  1. Which is not accomplished in an underfired furnace ?

  2. A.
    Increase in heating capacity/m2 of floor space.
    B.
    Elimination of cold spot at the bottom of the charge.
    C.
    Reduction in the temperature of furnace gases.
    D.
    Portection of the periphery of the charge from excessive radiation.

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  3. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of

  4. A.
    use of non-preheated combustion air.
    B.
    use of pulverised solid fuels.
    C.
    imperfect mixing of fuel & air and infiltration of air.
    D.
    use of excessive positive draft in the furnace.

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  5. Rate of heat release in a furnace, which is the measure of heat intensity is defined as

  6. A.
    kcal/hr/m3 combustion space.
    B.
    kcal/m3 combustion space.
    C.
    kcal/hr.
    D.
    none of these.

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  7. Oxygen enrichment of combustion air does not result in increase of the

  8. A.
    flame temperature.
    B.
    oxygen in the flue gas.
    C.
    stack loss.
    D.
    heat transfer rate in the furnace.

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  9. An example of recuperative furnace is the

  10. A.
    soaking pit
    B.
    open hearth furnace
    C.
    coke ovens
    D.
    none of these

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  11. Pick out the wrong statement.

  12. A.
    Addition of methane to the furnace atmosphere reduces decarburising by hydrogen.
    B.
    Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures.
    C.
    Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness.
    D.
    none of these.

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  13. Which one is not an induced draught furnace?

  14. A.
    Blast furnace stove
    B.
    Sintering furnace
    C.
    High pressure boiler
    D.
    None of these

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  15. Overfire burning in a furnace is a phenomenon characterised by

  16. A.
    supply of excess fuel.
    B.
    supply of excess air.
    C.
    burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air.
    D.
    none of these.

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  17. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

  18. A.
    premix
    B.
    outside mixing type
    C.
    rotary
    D.
    diffusion

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  19. Neutral atmosphere is maintained in a/an __________ furnace.

  20. A.
    cold rolled steel coil annealing
    B.
    open hearth
    C.
    soaking pit
    D.
    walking beam reheating

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