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Chemical Engineering :: Chemical Engineering Basics-2

  1. Pick out the wrong statement.

  2. A.

     For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1

    B.

     For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work

    C.

     Longitudinal joint is normally made butt joint to maintain the circularity of the vessel

    D.

     Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm

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  3. Diamagnetic materials

  4. A.

     Are magnetised by eddy currents only

    B.

     Are non-magnetic and can not be magnetised

    C.

     Are magnetised in direction opposite to the magnetic field

    D.

     Can be magnetised in one direction only

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  5. Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

  6. A.

     9100

    B.

     13000

    C.

     7000

    D.

     2550

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  7. Which of the following is an acidic constituent of B.F. slag ?

  8. A.

     SiO₂

    B.

     FeO

    C.

     MgO

    D.

     CaO

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  9. Dielectric

  10. A.

     Is an electrical insulating material

    B.

     Of low resistivity is preferred

    C.

     Should have high thermal conductivity

    D.

     Need not defy the corrosive action of chemicals

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  11. Largest application of laser welding is in __________ welding.

  12. A.

     Microspot

    B.

     Under water

    C.

     Precious metals

    D.

     Heavy structure

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  13. Nitriding of steel is a process for

  14. A.

     Case hardening

    B.

     Spheroidising

    C.

     Normalising

    D.

     Annealing

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  15. A dense structure of grinding wheel is not used for the

  16. A.

     Ductile material

    B.

     Hard materials

    C.

     Brittle materials

    D.

     Finishing cuts

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  17. The hardness of a grinding wheel is specified by the

  18. A.

     Alphabetical letter

    B.

     Rockwell hardness number

    C.

     Brinell hardness number

    D.

     None of these

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  19. Addition of silicon to cast iron

  20. A.

     Promotes graphite module formation

    B.

     Improves its ductility

    C.

     Does not promote graphite flakes formation

    D.

     Increases the fluidity of molten metal

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