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  1. Hot extrusion of aluminium is done in the temperature range of __________ °C.

  2. A.
    550-600
    B.
    450-500
    C.
    350-400
    D.
    250-300

  3. Stellite is a __________ material.

  4. A.
    ferrous
    B.
    ceramic
    C.
    cemented carbide
    D.
    non ferrous cast alloy cutting tool

  5. Percentage of argon (by volume) in dry atmospheric air is about

  6. A.
    0.09
    B.
    0.3
    C.
    0.57
    D.
    0.94

  7. An abrupt and sudden fall in the readinp of barometer is an indication of the

  8. A.
    storm
    B.
    rain
    C.
    clear weather
    D.
    cold wave

  9. Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.

  10. A.
    70 & 30
    B.
    30 & 70
    C.
    50 & 50
    D.
    90 & 10

  11. With increase in temperature, the electrical conductivity of a __________ decreases.

  12. A.
    semi-conductor
    B.
    metal or alloy
    C.
    dielectric
    D.
    none of these

  13. All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

  14. A.
    deuterium
    B.
    hydrogen
    C.
    neon
    D.
    helium

  15. Which of the following gases cause global warming ?

  16. A.
    Carbon monoxide
    B.
    Carbon dioxide
    C.
    Nitrogen
    D.
    Ozone

  17. Multistage compression of air as compared to single stage compression offers the advantage of

  18. A.
    power saving per unit weight of air delivered.
    B.
    moisture elimination in the inter-stage cooler.
    C.
    increased volumetric efficiency.
    D.
    all (a), (b) & (c).

  19. Fine grained steels have

  20. A.
    high brittleness
    B.
    higher tendency to distort
    C.
    high ductility
    D.
    none of these