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Chemical Engineering :: Process Control and Instrumentation

  1. Typical specifications for design stipulates the gain margin and phase margin to be respectively

  2. A.
    > 1.7 and > 30°
    B.
    < 1.7 and > 30°
    C.
    < 1.7 and < 30°
    D.
    > 1.7 and < 30°

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  3. Working principle of radiation pyrometer is based on the

  4. A.
    Wien's law
    B.
    Kirchoffs law
    C.
    Stafan-Boltzman law
    D.
    Seebeck effect

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  5. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

  6. A.
    Peltier effect
    B.
    Thomson effect
    C.
    Seebeck effect
    D.
    none of these

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  7. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

  8. A.
    Kelvin
    B.
    Centigrade
    C.
    Fahrenheit
    D.
    Reaumer

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  9. In a single tank system, the transfer function of level to inlet flow rate is

  10. A.
    R/TS
    B.
    R/(TS + 1)
    C.
    l(TS + l)
    D.
    1/TS

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  11. Which of the following is a desirable characteristic of an instrument ?

  12. A.
    High drift
    B.
    High fidelity
    C.
    High measuring lag
    D.
    Poor reproducibility

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  13. The operation of a rotameter is based on

  14. A.
    variable flow area.
    B.
    rotation of a turbine.
    C.
    pressure drop across a nozzle.
    D.
    pressure at a stagnation point.

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  15. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

  16. A.
    chromel-alumel
    B.
    iron-constantan
    C.
    platinum-platinum/rhodium
    D.
    none of these.

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  17. Instrumentation in a plant offers the advantage of

  18. A.
    greater safety of operation
    B.
    better quality of product
    C.
    greater operation economy
    D.
    all (a), (b) and (c)

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  19. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?

  20. A.
    Radiation/infrared pyrometer
    B.
    Filled system thermometer
    C.
    Mercury in glass thermometer
    D.
    Thermo electric pyrometer

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