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Chemical Engineering :: Chemical Engineering Basics-2

  1. Which of the following will resist maxi-mum shock & vibration without cracking?

  2. A.

     Grey cast iron

    B.

     White cast iron

    C.

     Malleable iron

    D.

     Graphite


  3. Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

  4. A.

     1.5

    B.

     3

    C.

     5

    D.

     7


  5. The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.

  6. A.

     Pulverised fuel

    B.

     Travelling grate stoker firing

    C.

     Circulating fluidised bed

    D.

     Fluidised bed


  7. Isotropic materials have the same __________ in all directions.

  8. A.

     Induced stresses

    B.

     Density

    C.

     Elastic properties

    D.

     Thermal properties


  9. Carbon is present in the form of __________ in grey cast iron.

  10. A.

     Spheroids

    B.

     Nodular aggregates of graphite

    C.

     Flakes

    D.

     Cementite


  11. First empirical temperature scale conceived is the __________ temperature scale.

  12. A.

     Absolute

    B.

     Reaumer

    C.

     Farenhite

    D.

     Celcius


  13. If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase.

  14. A.

     Convection

    B.

     Nucleate boiling

    C.

     Radiation

    D.

     Conduction


  15. Pick out the wrong statement.

  16. A.

     Molecules with symmetrical arrangements (.e.g. CH₄ or CCl₄) are nonpolar

    B.

     Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise

    C.

     Most of the hydrocarbons are nonpolar

    D.

     None of these


  17. Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

  18. A.

     Conductor

    B.

     Insulator

    C.

     Semi-conductor

    D.

     None of these


  19. Alloys having more than 80% copper are generally more

  20. A.

     Abrasion resistant

    B.

     Corrosion resistant

    C.

     Prone to season cracking

    D.

     Machinable