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Chemical Engineering :: Chemical Engineering Basics

  1. Lowering of recrystallisation temperature of metals can be achieved by its

  2. A.
    grain refinement.
    B.
    purification.
    C.
    working at lower temperature.
    D.
    all a, b & c.

  3. An example of a buffer solution is

  4. A.
    mercury
    B.
    lime water
    C.
    human blood
    D.
    concentrated nitric acid

  5. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

  6. A.
    370
    B.
    340
    C.
    320
    D.
    300

  7. Name the safety device used to protect the boiler, when the water level falls below a minimum level.

  8. A.
    Blow down valve
    B.
    Blow off cock
    C.
    Fusible plug
    D.
    Safety valve

  9. Cold chiesel's hammers are made of

  10. A.
    high speed steel
    B.
    high carbon steel
    C.
    forged steel
    D.
    mild steel

  11. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be

  12. A.
    higher, as it gives higher wavelength.
    B.
    lower, as it gives higher wavelength.
    C.
    higher, as it gives shorter wavelength.
    D.
    lower, as it gives shorter wavelength.

  13. Atomic __________ is a whole number for an element.

  14. A.
    number
    B.
    weight
    C.
    radius
    D.
    none of these

  15. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.

  16. A.
    +4000
    B.
    -4000
    C.
    10000
    D.
    - 10000

  17. Highest cutting speed is achieved by the __________ tool material.

  18. A.
    high speed steel
    B.
    carbide
    C.
    cast alloy
    D.
    plain carbon steel