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Chemical Engineering :: Chemical Engineering Basics-2

  1. A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid?

  2. A.

     Arsenic

    B.

     Antimony

    C.

     Lead

    D.

     None of these


  3. Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.

  4. A.

     Printing

    B.

     Developing

    C.

     Colour

    D.

     Fixation


  5. Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.

  6. A.

     1

    B.

     2.5

    C.

     4

    D.

     6


  7. Steel balls are manufactured by cold heading. After cold forming, they are subjected to

  8. A.

     Tempering

    B.

     Normalising

    C.

     Stress-relieving

    D.

     Artificial ageing


  9. __________ number is sometimes used in place of Grashoff number in free convection heat transfer.

  10. A.

     Stanton

    B.

     Brinkman

    C.

     Rayleigh

    D.

     Nusselt


  11. Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?

  12. A.

     Venturi scrubber

    B.

     Electrostatic precipitator

    C.

     Cyclone separator

    D.

     Fabric filter


  13. Volute casing of a centrifugal pump does not facilitate

  14. A.

     Uniform flow of fluid coming out of the impeller

    B.

     Increase in the pump efficiency

    C.

     Conversion of the part of the velocity head to the pressure head

    D.

     Conversion of the part of the pressure head to velocity head


  15. Function of gear box is to

  16. A.

     Reduce the speed

    B.

     Obtain variable speed

    C.

     Increase the speed

    D.

     Produce high torque


  17. Function of fusible plug in a boiler is to

  18. A.

     Drain out water and sludge from the boiler during repair

    B.

     Put off fire in the furnace when water level in the boiler falls to unsafe limit

    C.

     Guard the boiler in case of abnormal rise in steam pressure

    D.

     All of the above


  19. Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is

  20. A.

     3

    B.

     5

    C.

     0.5

    D.

     1.5