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Chemical Engineering :: Process Control and Instrumentation

  1. The symbol for "capillary line" in instrumentation diagram is

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  3. __________ is undesirable in thermocouples used in industries,

  4. A.
    Linear relation of emf to temperature
    B.
    Corrosion resistance
    C.
    Oxidation resistance
    D.
    Non-linear relation of emf to temperature

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  5. Select the correct statement from the following.

  6. A.
    The frequency response of a pure capacity process is unbounded.
    B.
    The phase lag of a pure time delay system decreases with increasing frequency.
    C.
    The amplitude ratio of a pure capacity process is inversely proportional to frequency.
    D.
    The amplitude ratio of a pure time delay system increases with frequency.

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  7. For an input forcing function, X(t) = 2t2, the Laplace transform of this function is

  8. A.
    2/s2
    B.
    4/s2
    C.
    2/s3
    D.
    4/s3

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  9. Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

  10. A.
    thermocouple
    B.
    reistance thermometer
    C.
    mercury in glass thermometer
    D.
    vapor pressure thermometer

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  11. The __________ of a vapor pressure thermometer is a secondary element.

  12. A.
    pointer
    B.
    Bourdon tube
    C.
    bulb
    D.
    none ofthese

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  13. Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

  14. A.
    chromel-alumel
    B.
    iron-constantan
    C.
    platinum-platinum+rhodium
    D.
    either (a), (b) or (c)

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  15. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

  16. A.
    Seebeck effect
    B.
    Peltier effect
    C.
    Joule heating effect
    D.
    Thomson effect

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  17. The second order system with the transfer function has a damping ratio of

  18. A.
    2.0
    B.
    0.5
    C.
    1.0
    D.
    4.0

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  19. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.

  20. A.
    load
    B.
    controlled
    C.
    manipulated
    D.
    none of these

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