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  1. Diamagnetic materials

  2. A.
    are magnetised by eddy currents only.
    B.
    are non-magnetic and can not be magnetised.
    C.
    are magnetised in direction opposite to the magnetic field.
    D.
    can be magnetised in one direction only.

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  3. In connection with corrosion of metals, passivation is the process that

  4. A.
    intensifies deterioration.
    B.
    changes the composition of the metal.
    C.
    inhibits further deterioration.
    D.
    none of these.

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  5. With increase in impurities in metals, their corrosion resistances

  6. A.
    increase
    B.
    decrease
    C.
    remain same
    D.
    may increase or decrease ; depending on the type of metal

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  7. Most important property of steels for use in automobile bodies is the

  8. A.
    formability
    B.
    yield strength
    C.
    toughness
    D.
    resilience

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  9. Consideration of the creep is the most important in case of the

  10. A.
    blades of gas turbine.
    B.
    piston of an I. C. engine.
    C.
    flywheel of steam engine.
    D.
    cycle chain.

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  11. Non-ferrous alloys used for making cutting tools need not have high

  12. A.
    abrasion resistance
    B.
    toughness
    C.
    red hardness
    D.
    cutting speed

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  13. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

  14. A.
    forging
    B.
    cold rolling
    C.
    hot rolling
    D.
    casting

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  15. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be

  16. A.
    more
    B.
    less
    C.
    same
    D.
    either more or less; depends on the climatic conditions.

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  17. Glycerene is used as a coolant in cooling of some engines instead of water, because

  18. A.
    its higher boiling point (290°C) increases its heat carrying capacity.
    B.
    compartively less weight of coolant is required.
    C.
    smaller radiator can be used.
    D.
    all a, b & c.

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  19. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

  20. A.
    cold
    B.
    work
    C.
    age
    D.
    induction

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