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  1. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

  2. A.

     Partial pressure of water vapour is less than the total pressure

    B.

     Humidity is < 100% & dew point temperature of air has not reached

    C.

     Dew point temperature of air has not reached & air is not saturated fully

    D.

     Air is fully saturated

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  3. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

  4. A.

     Partial pressure of water vapour is less than the total pressure

    B.

     Humidity is < 100% & dew point temperature of air has not reached

    C.

     Dew point temperature of air has not reached & air is not saturated fully

    D.

     Air is fully saturated

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  5. Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.

  6. A.

     18

    B.

     16

    C.

     14

    D.

     12

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  7. A pycnometer is used for the measurement of

  8. A.

     Flow rate of molten metal

    B.

     Specific gravity of a liquid

    C.

     Composition of alloys

    D.

     Concentration of a solution

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  9. Filler metal is used in __________ welding.

  10. A.

     Braze

    B.

     Electric spot

    C.

     Projection

    D.

     Seam

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  11. A colloidal system, in which a liquid is dispersed in gas is called a/an

  12. A.

     Gel

    B.

     Aerosol

    C.

     Foam

    D.

     Emulsion

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  13. Disposable patterns are made of

  14. A.

     Metal

    B.

     Polystyrene

    C.

     Rubber

    D.

     Wood

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  15. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

  16. A.

     X1.5

    B.

     X0.8

    C.

     X-1.5

    D.

     X-0.8

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  17. With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.

  18. A.

     Supercharging

    B.

     Wall temperature

    C.

     Compression ratio

    D.

     Engine speed

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  19. If a solid is compressed adiabatically in its elastic range, its __________ remains constat

  20. A.

     Internal energy

    B.

     Enthalpy

    C.

     Entropy

    D.

     Temperature

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