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Engineering Materials - Section 6

  1. The alloying element which reduces the formation of iron sulphide in steel is

    2. A.
    chromium
    B.
    nickel
    C.
    vanadium
    D.
    manganese

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  2. For a steel containing 0.8% carbon

    3. A.
    there is no critical point
    B.
    there is only one critical point
    C.
    there are two critical points
    D.
    there can be any number of critical points

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  3. In high speed steels, manganese is used to tougher the metal and to increase its

    4. A.
    yield point
    B.
    critical temperature
    C.
    melting point
    D.
    hardness

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  4. The machinability of aluminium increases when __________ is added to aluminium.

    5. A.
    copper
    B.
    magnesium
    C.
    silicon
    D.
    lead and bismuth

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  5. Body centred cubic space lattice is found in

    6. A.
    zinc, magnesinm, cobalt, cadmium, antimony and bismuth
    B.
    gamma-iron, aluminium, copper, lead, silver and nickel
    C.
    alpha-iron, tungsten, chromium and molybdenum
    D.
    none of the above

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  6. When a low carbon steel is heated upto lower critical temperature,

    7. A.
    there is no change in grain size
    B.
    the average grain size is a minimum
    C.
    the grain size increases very rapidly
    D.
    the grain size first increases and then decreases very rapidly

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  7. Grey cast iron is __________ than white cast iron.

    8. A.
    softer
    B.
    harder

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  8. Corrosion resistance of steel is increased by adding nickel and chromium.

    9. A.
    Agree
    B.
    Disagree

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  9. The silicon steel is widely used for

    10. A.
    connecting rods
    B.
    cutting tools
    C.
    generators and transformers in the form of laminated cores
    D.
    motor car crankshafts

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  10. Ball bearings are, usually, made from

    11. A.
    low carbon steel
    B.
    high carbon steel
    C.
    medium carbon steel
    D.
    chrome steel

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