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  1. In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of

  2. A.
    chromium, tungsten & vanadium.
    B.
    tungsten, chromium & vanadium.
    C.
    tungsten, vanadium & chromium.
    D.
    tungsten, chromium & molybdenum.

  3. Role of a "collector" in froth floatation is to

  4. A.
    form a water repelling film on the mineral surface.
    B.
    create and stabilise the froth.
    C.
    act as a surface.
    D.
    collect the minerals according to their specific gravity.

  5. For the running of power generating turbines, the steam used should be

  6. A.
    wet
    B.
    superheated
    C.
    at ordinary pressure
    D.
    none of these

  7. Creep consideration is the most important in case of the

  8. A.
    blades of gas turbines.
    B.
    steam engine flywheel.
    C.
    cast iron pipes.
    D.
    cycle chains.

  9. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10-16 m2 . S-1 and it is 1.94 x 10-14 m2 S-1 at 1200 K. The activation energy (in k. J.mole-1 ) for the diffusion of Ni in Cu is

  10. A.
    130
    B.
    180
    C.
    230
    D.
    250

  11. Which of the following has rotten eggy smell ?

  12. A.
    Hydrogen sulphide
    B.
    Styrene
    C.
    Phenol
    D.
    Dimethyl amine

  13. Freezing of 35% oleum during its shipment in winter is avoided by the addition of small amount of

  14. A.
    hydrochloric acid
    B.
    methyl alcohol
    C.
    formic acid
    D.
    nitric acid

  15. In hot working, dynamic recovery occurs in

  16. A.
    metals of low stacking fault energy.
    B.
    metals of high stacking fault energy e.g. α-iron.
    C.
    single crystal of Ni-based superalloys.
    D.
    none of these.

  17. Which of the following manufacturing processes produces the strongest components ?

  18. A.
    Forging
    B.
    Cold rolling
    C.
    Hot rolling
    D.
    Die casting

  19. Cast iron compared to steel is better in

  20. A.
    ductility
    B.
    strength
    C.
    malleability
    D.
    fluidity & castability