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  1. In extrusion of metals, which of the following statement is true ?

  2. A.
    speed of the extruded material is same as that of ram speed.
    B.
    Redundant work is a function of the die angle.
    C.
    Relative motion between the billet surface and the container wall is always present.
    D.
    Hollow ram is used for indirect extrusion.

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  3. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.

  4. A.
    20
    B.
    200
    C.
    500
    D.
    1000

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  5. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

  6. A.
    Emissivity of pipe surface.
    B.
    Diameter & length of the pipe.
    C.
    Temperature of hot pipe surface & that of air in the room.
    D.
    none of these.

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  7. Machinability of hard alloys and tool steels is improved by

  8. A.
    spherodising
    B.
    annealing
    C.
    tempering
    D.
    normalising

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  9. Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

  10. A.
    cementite
    B.
    austenite
    C.
    martensite
    D.
    pearlite

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  11. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

  12. A.
    grey
    B.
    black
    C.
    opaque
    D.
    white

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  13. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

  14. A.
    compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
    B.
    maintaining vacuum on tube side is more difficult than that on the shell side.
    C.
    water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
    D.
    condenser can act as a storage unit for condensed steam.

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  15. Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.

  16. A.
    X-rays
    B.
    γ-rays
    C.
    α-rays
    D.
    β-rays

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  17. Absolute zero pressure can be attained at a temperature of

  18. A.
    0°C
    B.
    50°K
    C.
    0°R
    D.
    none of these

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  19. The product out from a cupola is called

  20. A.
    wrought iron
    B.
    pig iron
    C.
    cast iron
    D.
    none of these

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