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Mechanical Engineering :: Engineering Materials

  1. The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.

  2. A.
    True
    B.
    False

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  3. Muntz metal (Yellow brass) contains

  4. A.
    70% copper and 30% zinc
    B.
    60% copper and 40% zinc
    C.
    59% copper, 40% zinc and 1% tin
    D.
    60.45% copper, 35.2% zinc and 5.35% nickel

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  5. Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

  6. A.
    Diamond, Carbide, High speed steel
    B.
    Carbide, Diamond, High speed steel
    C.
    High speed steel, Carbide, Diamond
    D.
    High speed steel, Diamond, Carbide

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  7. The slag from the blast furnace

  8. A.
    is used as a ballast for rail road
    B.
    is mixed with tar for road making
    C.
    consists of calcium, aluminium and ferrous silicates
    D.
    all of the above

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  9. Which of the following is a mesomorphous material?

  10. A.
    Mica
    B.
    Silver
    C.
    Lead
    D.
    Brass

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  11. The casting ability of aluminium increases when __________ is added to aluminium.

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

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  13. Manganese bronze has

  14. A.
    good wearing qualities and high elasticity
    B.
    high yield point, high fatigue limit and excellent cold and hot corrosion resistance
    C.
    high resistance to corrosion
    D.
    valuable cold working property

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  15. A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as

  16. A.
    normalising
    B.
    annealing
    C.
    austempering
    D.
    martempering

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  17. Silicon bronze contains

  18. A.
    60% copper, 35% zinc and 5% manganese
    B.
    88% copper, 10% tin and 2% zinc
    C.
    96% copper, 3% silicon and 1% manganese
    D.
    76% copper, 20% silicon and 4% zinc

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  19. In acidic bessemer process, the furnace is lined with

  20. A.
    silica bricks
    B.
    a mixture of tar and burnt dolomite bricks
    C.
    either (a) or (b)
    D.
    none of these

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