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Chemical Engineering :: Chemical Engineering Basics-2

  1. Which of the following has the highest density and the lowest melting point ?

  2. A.

     Stainless steel

    B.

     Titanium

    C.

     Lead

    D.

     Aluminium

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  3. Machinability of hard alloys and tool steels is improved by

  4. A.

     Spherodising

    B.

     Annealing

    C.

     Tempering

    D.

     Normalising

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  5. A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will

  6. A.

     Increase

    B.

     Decrease

    C.

     Remain unaffected

    D.

     May increase or decrease; depends on the thickness of each layer

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  7. In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be

  8. A.

     Conduction

    B.

     Radiation

    C.

     Natural convection

    D.

     Forced convection

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  9. Annealing of cast iron

  10. A.

     Softens it to facilitate machining

    B.

     Decreases the free carbon

    C.

     Increases the strength

    D.

     None of these

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  11. The dimensions of Planck's constant is the same as that of the

  12. A.

     Kinetic energy

    B.

     Momentum

    C.

     Electrostatic potential

    D.

     None of these

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  13. Sulphur is melted in the sulphuric acid plant most commonly by employing

  14. A.

     Electrical heater

    B.

     Steam heater

    C.

     Direct fuel oil fired heater

    D.

     Gas fired furnace

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  15. With increase in carbon percentage in steel, its

  16. A.

     Yield stress decreases

    B.

     Elongation percent increases

    C.

     Tensile strength increases

    D.

     Impact strength increases

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  17. Coating provided on the electrodes used in the arc welding is not expected to

  18. A.

     Add alloying elements

    B.

     Prevent electrode from contamination

    C.

     Stabilise the arc

    D.

     Provide protective atmosphere to weld

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  19. Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

  20. A.

     Vicker's hardness test

    B.

     Shore sceleroscope test

    C.

     Brinell hardness test

    D.

     Rockwell hardness test

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