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  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

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  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

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  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

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  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

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  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

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  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

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  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

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

  16. A.

     Septic tank

    B.

     Oxidation well

    C.

     Digestor

    D.

     Lagoon

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  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

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  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

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