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Chemical Engineering :: Chemical Engineering Basics

  1. Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?

  2. A.
    Copper
    B.
    Zinc
    C.
    both 'a' & 'b'
    D.
    neither 'a' nor 'b'

  3. 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.

  4. A.
    convection
    B.
    nucleate boiling
    C.
    radiation
    D.
    conduction

  5. Piezoelectric is a material

  6. A.
    whose properties is midway between the constituent materials.
    B.
    which gets polarised, when stressed.
    C.
    in which magnetising force reduces when current flowing through it is in-cresed.
    D.
    which changes dimensions due to applied field.

  7. Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.

  8. A.
    18
    B.
    16
    C.
    14
    D.
    12

  9. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.

  10. A.
    enthalpy
    B.
    relative humidity
    C.
    wet bulb temperature
    D.
    dew point temperature

  11. Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity.

  12. A.
    50
    B.
    250
    C.
    450
    D.
    850

  13. Ceramic tips for the cutting tool are prepared from __________ powder.

  14. A.
    carbon
    B.
    silicon carbide
    C.
    aluminium oxide
    D.
    tungsten

  15. Fatigue strength of a metal is improved by

  16. A.
    overstressing.
    B.
    scratching the surface.
    C.
    raising the temperature.
    D.
    understressing.

  17. Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2 . Then the outcoming steam will be

  18. A.
    wet
    B.
    saturated
    C.
    superheated
    D.
    none of these

  19. An "orange peel" effect is observed

  20. A.
    as a defect during metal casting/ welding.
    B.
    during deep drawing of metallic sheet having large grain size.
    C.
    during faulty heat treatment of steel.
    D.
    during extrusion of metal through a die.