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Chemical Engineering Basics-2 - Section-1
  1. Which of the following is not an ore of iron?

    2. A.

     Chalcopyrite
    B.

     Magnetite
    C.

     Hemetite
    D.

     Limonite

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  2. Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?

    3. A.

     Cobalt: It contributes to rerl hardness by hardening ferrite
    B.

     Molybdenum: It forms abrasion resisting particles
    C.

     Phosphorous: It improves machinability in free cutting steels
    D.

     Silicon: It reduces oxidation resistance

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  3. Corrosion of metals can not be prevented by its

    4. A.

     Tempering
    B.

     Chromising
    C.

     Aluminising
    D.

     Alloying

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  4. Which of the following materials has the least scrap value?

    5. A.

     Aluminium
    B.

     Stainless steel
    C.

     Brass
    D.

     Copper

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  5. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons.

    6. A.

     Lack of free
    B.

     Excess of
    C.

     Decrease in
    D.

     None of these

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  6. Inertial forces are obtained, when the elastic forces are multiplied by __________ number.

    7. A.

     Mach
    B.

     Froude
    C.

     Reynolds
    D.

     Euler

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  7. Lubricants can be used to

    8. A.

     Transmit power hydraulically
    B.

     Form a seal in compressors
    C.

     Remove contaminants by flushing and to insulate transformers, switchgears etc
    D.

     All of the above

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  8. Lubrication is done to control

    9. A.

     Friction
    B.

     Wear
    C.

     Temperature
    D.

     All of the above

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  9. In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is

    10. A.

     1
    B.

     1.4
    C.

     1.5
    D.

     Y = Cp/Cv

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  10. Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.

    11. A.

     Flanged iron
    B.

     Collar
    C.

     Flexible
    D.

     Expansion

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