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Chemical Engineering :: Chemical Engineering Basics-2

  1. Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?

  2. A.

     High fusibility & fluidity

    B.

     High thermal conductivity

    C.

     Low density

    D.

     High chemical activity


  3. Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?

  4. A.

     Quartz

    B.

     Flourspar

    C.

     Dolomite

    D.

     Manganese ore


  5. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

  6. A.

     9.5:1

    B.

     12.5:1

    C.

     15.5 :1

    D.

     18.5 : 1


  7. Fog is an example of colloidal system of

  8. A.

     Solid dispersed in gas

    B.

     Solid dispersed in liquid

    C.

     Liquid dispersed in gas

    D.

     Gas dispersed in liquid


  9. Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

  10. A.

     Film

    B.

     Nucleate

    C.

     Transition

    D.

     All of the above


  11. In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.

  12. A.

     Film

    B.

     Nucleate

    C.

     Transition

    D.

     All of the above


  13. Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.

  14. A.

     0.01 to 0.10

    B.

     0.2 to 0.4

    C.

     0.5 to 0.7

    D.

     0.8 to 1.0


  15. The underground well of a biogas plant is called the

  16. A.

     Septic tank

    B.

     Oxidation well

    C.

     Digestor

    D.

     Lagoon


  17. Heat required to raise the temperature of a body by 1 °C is called its

  18. A.

     Heat capacity

    B.

     Specific heat capacity

    C.

     Thermal conductivity

    D.

     Water equivalent


  19. Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

  20. A.

     0.8

    B.

     7.8

    C.

     200

    D.

     10000