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Chemical Engineering :: Chemical Engineering Basics

  1. The most suitable material of construction for a sewer to carry sewage under high pressure is

  2. A.
    asbestos cement
    B.
    steel
    C.
    cement concrete
    D.
    stoneware

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  3. Filler material used in welding should have __________ as compared to the parent metal to be welded.

  4. A.
    lower melting temperature
    B.
    same melting temperature
    C.
    same composition
    D.
    both 'b' & 'c'

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  5. Oxygen cylinders used for autogenous (cutting/welding) purposes are

  6. A.
    seamless & made of steel.
    B.
    heat treated before use.
    C.
    made by sand casting.
    D.
    welded steel cylinders.

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  7. Identify the correct statement.

  8. A.
    Sphlerite is zinc oxide.
    B.
    The first law of the thermodynamics is stated as δE = δQ - δW.
    C.
    Lead can be produced in a blast furnace.
    D.
    T. ferrooxidans is a fungus that can be used for leaching chalcopyrite.

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  9. Dowtherm is a

  10. A.
    high temperature heating medium (a petroleum product).
    B.
    product of coal tar distillation.
    C.
    very heat sensitive material.
    D.
    none of these.

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  11. To counteract the bad effects of strain hardening on a cold formed part, it must be

  12. A.
    tempered
    B.
    normalised
    C.
    annealed
    D.
    hardened

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  13. The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then

  14. A.
    wet bulb temperature=dry bulb temperature.
    B.
    wet bulb temperature=dew point temperature.
    C.
    saturation temperature=dew point temperature.
    D.
    all 'a' , 'b' & 'c'

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  15. Galvanic corrosion can not be prevented by

  16. A.
    cathodic protection.
    B.
    anodic protection.
    C.
    usage of largest possible anodic area.
    D.
    any one of these.

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  17. Fire in fuel gas pipelines is extinguished most effectively by

  18. A.
    spraying water.
    B.
    blanketting the area with nitrogen atmosphere.
    C.
    fire fighting foam.
    D.
    none of these.

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  19. Which of the following is the most suitable abrasive for grinding high tensile strength materials ?

  20. A.
    Silicon carbide
    B.
    Corundum
    C.
    Aluminium oxide
    D.
    Boron carbide

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