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  1. Titanium is added to molten aluminium alloys before casting for the purpose of

  2. A.
    grain refinement.
    B.
    increasing corrosion resistance.
    C.
    reducing porosity.
    D.
    improving fluidity.

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  3. Cemented carbide tools are not suitable for cutting

  4. A.
    aluminium
    B.
    brass
    C.
    cast iron
    D.
    steel

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  5. The difference between gross & net calorific values of fuel is due to the

  6. A.
    sensible heat carried away by the flue gases.
    B.
    heat carried away by the steam from the moisture content of the fuel.
    C.
    heat lost by radiation.
    D.
    heat carried away by steam from the combustion of hydrogen in the fuel.

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  7. Which of the following is preferred for rivetting ?

  8. A.
    Lap joint
    B.
    Butt joint
    C.
    Either (a) or (b)
    D.
    Neither (a) nor (b)

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  9. Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

  10. A.
    tempering
    B.
    hardening
    C.
    annealing
    D.
    normalising

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  11. Mild steel has __________ crystal lattice structure.

  12. A.
    face centred cubic (fcc)
    B.
    body centred cubic (bcc)
    C.
    orthorhombic
    D.
    cubic

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  13. Which of the following does not have a sharp melting point ?

  14. A.
    Thoria
    B.
    Glass
    C.
    Ice
    D.
    Pig iron

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  15. Aluminium is extracted from

  16. A.
    chalcocite
    B.
    bauxite
    C.
    galena
    D.
    none of these

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  17. __________ fluid force is not considered in the Navier-Stokes equation.

  18. A.
    Turbulent
    B.
    Viscous
    C.
    Gravity
    D.
    Pressure

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  19. Tin is not present as an alloying element in

  20. A.
    phosphor bronze
    B.
    gun metal
    C.
    fusible metal
    D.
    white metal

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