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  1. Stainless steel is welded with difficulty because of

  2. A.
    its high melting temperature.
    B.
    chances of cracking.
    C.
    oxide film formation.
    D.
    chromium carbide formation.

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  3. For preparation of porous bearings by powder metallurgy, preferred particle shape is

  4. A.
    spherical
    B.
    nodular
    C.
    irregular
    D.
    no preferred shape

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  5. The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.

  6. A.
    0.5
    B.
    3
    C.
    10
    D.
    25

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  7. High speed steel tools retain their hardness upto a temperature of __________ °C.

  8. A.
    500
    B.
    750
    C.
    900
    D.
    1100

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  9. Wrought iron does not have

  10. A.
    uniform strength in all directions.
    B.
    ability to hold protective coating.
    C.
    high ductility & corrosion resistance.
    D.
    easily weldable characteristics.

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  11. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when

  12. A.
    strain rate is increased.
    B.
    grain size is increased.
    C.
    prior cold deformation is increased.
    D.
    not affected by any of the above parameters.

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  13. __________ are normally subjected to sub-zero treatment.

  14. A.
    Highly stressed parts
    B.
    Gauges or precision parts
    C.
    Cold rolled sheets
    D.
    Non machinable materials

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  15. Induced draft fans provided in large thermal power plant boilers have __________ blades.

  16. A.
    forward curved
    B.
    backward curved
    C.
    double curved
    D.
    radial or straight

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  17. Which of the following has the highest value of refractive index ?

  18. A.
    Brine (sea water)
    B.
    Diamond
    C.
    Distilled water
    D.
    Glass

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  19. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

  20. A.
    1
    B.
    10
    C.
    30
    D.
    45

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