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Mechanical Engineering :: Engineering Materials

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Engineering Materials - Section 6

  1. Chromium when added to steel __________ the tensile strength.

    2. A.
    does not effect
    B.
    decreases
    C.
    increases

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  2. Which of the following is added in low carbon steels to prevent them from becoming porous?

    3. A.
    Sulphur
    B.
    Phosphorus
    C.
    Manganese
    D.
    Silicon

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  3. A steel with carbon __________ is known as hypo-eutectoid steel.

    4. A.
    0.8%
    B.
    below 0.8%
    C.
    above 0.8%

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  4. Free cutting steels

    5. A.
    contain carbon in free from
    B.
    require minimum cutting force
    C.
    is used where rapid machining is the prime requirement
    D.
    can be cut freely

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  5. The presence of hydrogen in steel causes

    6. A.
    reduced neutron absorption cross-section
    B.
    improved weldability
    C.
    embrittlement
    D.
    corrosion resistance

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  6. Tin base white metals are used where the bearings are subjected to

    7. A.
    large surface wear
    B.
    elevated temperatures
    C.
    light load and pressure
    D.
    high pressure and load

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  7. The charge of the blast furnace consists of

    8. A.
    calcined ore (8 parts ), coke (4 parts) and limestone (1 part)
    B.
    calcined ore (4 parts), coke (1 part) and limestone (8 parts)
    C.
    calcined ore (1 part), coke (8 part) and limestone (4 parts)
    D.
    calcined ore, coke and limestone all in equal parts

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  8. The ability of a material to resist fracture due to high impact loads, is called

    9. A.
    strength
    B.
    stiffness
    C.
    toughness
    D.
    brittleness

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  9. The purpose of heat treatment is to

    10. A.
    relieve the stresses set up in the material after hot or cold working
    B.
    modify the structure of the material
    C.
    change grain size
    D.
    any one of these

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  10. An alloy of copper, tin and zinc is known as

    11. A.
    brass
    B.
    bronze
    C.
    gun metal
    D.
    muntz metal

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