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Chemical Engineering :: Chemical Engineering Basics-2

  1. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than

  2. A.

     5

    B.

     10

    C.

     20

    D.

     35


  3. With increase in impurities in metals, their corrosion resistances

  4. A.

     Increase

    B.

     Decrease

    C.

     Remain same

    D.

     May increase or decrease ; depending on the type of metal


  5. Uniform ramming of sand in green sand moulding process leads to

  6. A.

     Reduced chance of gas porosity

    B.

     Greater dimensional stability of the casting

    C.

     Uniform flow of molten metal into the mould cavity

    D.

     Less sand expansion type of casting defect


  7. Pick out the wrong statement. Termination of polymerisation reaction occurs, if the

  8. A.

     Catalyst supply is stopped

    B.

     Monomer supply is exhausted

    C.

     Impurities present in monomers interfere with the chemical reaction

    D.

     Two ends of a chain of molecules join


  9. Statistical quality control was developed by __________ , an American scientist during world war II.

  10. A.

     Water shewhart

    B.

     Fredric Taylor

    C.

     John Wright

    D.

     Woolmer


  11. Most important property of steels for use in automobile bodies is the

  12. A.

     Formability

    B.

     Yield strength

    C.

     Toughness

    D.

     Resilience


  13. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

  14. A.

     Fluidity

    B.

     Basicity

    C.

     Acidity

    D.

     Viscosity


  15. In a titration involving weak acid and strong base, the preferred indicator is

  16. A.

     Methyl orange

    B.

     Phenolphthalein

    C.

     Ethyl orange

    D.

     Fehling's solution


  17. Projection welding & stud welding is categorised as the __________ welding.

  18. A.

     Pressure

    B.

     Thermit

    C.

     Resistance

    D.

     Arc


  19. Filler metal is not used in the __________ welding.

  20. A.

     Seam

    B.

     Electric spot

    C.

     Projection

    D.

     All of the above