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Mechanical Engineering :: Engineering Materials

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Engineering Materials - Section 6

  1. Which of the following statement is true about brittle fracture?

    2. A.
    High temperature and low strain rates favour brittle fracture
    B.
    Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
    C.
    Brittle fracture is always preceded by noise
    D.
    Cup and cone formation is characteristic for brittle materials

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  2. Grey cast iron has

    3. A.
    carbon in the form of free graphite
    B.
    high tensile strength
    C.
    low compressive strength
    D.
    all of these

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  3. Induction hardening is basically a

    4. A.
    carburising process
    B.
    surface hardening process
    C.
    core-hardening process
    D.
    none of these

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  4. When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

    5. A.
    white cast iron
    B.
    nodular cast iron
    C.
    malleable cast iron
    D.
    alloy cast iron

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  5. The strength is the ability of a material to resist

    6. A.
    deformation under stress
    B.
    externally applied forces with breakdown or yielding
    C.
    fracture due to high impact loads
    D.
    none of these

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  6. The material widely used for making pendulums of clocks is

    7. A.
    stainless steel
    B.
    high speed steel
    C.
    heat resisting steel
    D.
    nickel steel

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  7. The stiffness is the ability of a material to resist

    8. A.
    deformation under stress
    B.
    fracture due to high impact loads
    C.
    externally applied forces with breakdown or yielding
    D.
    none of the above

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  8. The blade of a power saw is made of

    9. A.
    boron steel
    B.
    high speed steel
    C.
    stainless steel
    D.
    malleable cast iron

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  9. In induction hardening __________ is high.

    10. A.
    current
    B.
    voltage
    C.
    frequency
    D.
    temperature

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  10. The metal suitable for bearings subjected to light loads, is

    11. A.
    silicon bronze
    B.
    white metal
    C.
    monel metal
    D.
    phosphor bronze

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