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Chemical Engineering :: Chemical Engineering Basics-2

  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


  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


  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


  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


  9. Filler metal is used in __________ welding.

  10. A.

     Braze

    B.

     Electric spot

    C.

     Projection

    D.

     Seam


  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


  13. Disposable patterns are made of

  14. A.

     Metal

    B.

     Polystyrene

    C.

     Rubber

    D.

     Wood


  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


  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


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

  20. A.

     Internal energy

    B.

     Enthalpy

    C.

     Entropy

    D.

     Temperature