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  1. When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is

  2. A.
    cooled and dehumified.
    B.
    heated and humidified.
    C.
    cooled and humidified.
    D.
    heated and dehumidified.

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  3. The hardness of the lathe bed material is measured by the

  4. A.
    shore sceleroscope.
    B.
    Brinnel hardness tester.
    C.
    Vicker's hardness tester.
    D.
    Rockwell hardness tester.

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  5. RADAR is

  6. A.
    acronym for Radio Detection and Ranging.
    B.
    name of technique for locating distant objects.
    C.
    name of instrument for locating distant objects.
    D.
    all (a), (b) & (c)

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  7. In the floatation process, pine oil is used as the

  8. A.
    collector
    B.
    activator
    C.
    frother
    D.
    depressant

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  9. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.

  10. A.
    impact strength
    B.
    percent elongation
    C.
    hardness
    D.
    both 'b' & 'c'

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  11. Pick out the correct statement.

  12. A.
    A base is always soluble in water.
    B.
    Hydrogen is released whenever a metal reacts with an acid.
    C.
    Sodium hydroxide is both a base and an alkali.
    D.
    All indicators give red solution with an acid.

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  13. Ageing of steel refers to the

  14. A.
    degradation of steel by corrosion.
    B.
    failure of steel structure by overstress-ing.
    C.
    return of sharp yield point in temper rolled low carbon sheet after a period of time.
    D.
    decarburisation of steel by overheating.

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  15. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

  16. A.
    partial pressure of water vapour is less than the total pressure.
    B.
    humidity is < 100% & dew point temperature of air has not reached.
    C.
    dew point temperature of air has not reached & air is not saturated fully.
    D.
    air is fully saturated.

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  17. When metals are heated to high temperature, their __________ increases in general.

  18. A.
    atomic vibration
    B.
    creep strength
    C.
    yield stress & ultimate tensile strength
    D.
    toughness & stiffness

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  19. A friction lighter is normally used for lighting gas welding torch, because of the reason that

  20. A.
    its initial cost is very low.
    B.
    duration of spark created is very small.
    C.
    safety of welder is ensured.
    D.
    it is easier to operate & maintain.

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