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  1. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

  2. A.
    fluidity
    B.
    basicity
    C.
    acidity
    D.
    viscosity

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  3. The thermodynamic law, PVy = constant, is not followed by the

  4. A.
    free expansion of an ideal gas.
    B.
    adiabatic expansion of steam in turbine.
    C.
    adiabatic compression of air.
    D.
    ideal compression of air.

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  5. Pick out the wrong statement about the machinability of metals. Machinability of a metal

  6. A.
    decreases with increase in strain hardening tendencies.
    B.
    decreases with increase in hardness, in general.
    C.
    depends on the composition, microstructure and physical & mechanical properties.
    D.
    decreases with increases in tensile strength & decrease in grain size.

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  7. The refrigerant freon-12 is chemically

  8. A.
    CCl2F2
    B.
    CCl3F
    C.
    CClF3
    D.
    CCl4F

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  9. Which of the following phenomenon will exhibit the minimum heat transfer?

  10. A.
    Boiling.
    B.
    Forced convection in air.
    C.
    Free convection in air.
    D.
    Conduction in air.

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  11. Upto the critical radius of insulation, added insulation, will

  12. A.
    increase the heat loss.
    B.
    decrease heat loss and will have no effect beyond that.
    C.
    decrease heat flux.
    D.
    reduce convection heat loss compared to conduction heat less.

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  13. Limestone is added in the blast furnace (during pig iron manufacture) to

  14. A.
    form slag by combining with impurities.
    B.
    supply heat by undergoing exothermic reaction with impurities.
    C.
    reduce the coke consumption.
    D.
    reduce slag viscosity.

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  15. Cementite is in the lamellar form in the __________ phase of steel.

  16. A.
    martensitic
    B.
    bainitic
    C.
    pearlitic
    D.
    ferritic

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  17. To improve the machinability of steel, it is generally subjected to

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

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  19. Silicon in steel

  20. A.
    makes it usable in almost all magnetic circuits where alternating current is used.
    B.
    increases its electrical resistivity and decreases the hysteresis loss.
    C.
    is present upto 5% & 4% respectively when used in transformers & motor armatures.
    D.
    all 'a', 'b' & 'c'.

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