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Chemical Engineering :: Process Control and Instrumentation

  1. Which of the following is an undesirable dynamic characteristic of an instrument ?

  2. A.
    Reproducibility
    B.
    Dead zone
    C.
    Time lag
    D.
    Static error

  3. Which of the following is not the triple point of water ?

  4. A.
    32°R
    B.
    273°K
    C.
    492°R
    D.
    32°F

  5. Pick out the one which is a first order instrument.

  6. A.
    Mercury in glass thermometer (without any covering or air gap).
    B.
    Bare metallic thermometer.
    C.
    Bare vapor pressure thermometer.
    D.
    All (a), (b) and (c).

  7. Load cells are used for the measurement of

  8. A.
    stress
    B.
    weight
    C.
    strain
    D.
    velocity

  9. Which of the following is the dynamic characteristics of an instrument ?

  10. A.
    Reproducibility
    B.
    Sensitivity
    C.
    Dead zone
    D.
    Fidelity

  11. Pick out the wrong statement.

  12. A.
    O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
    B.
    CO2 is the strongest paramagnetic gas.
    C.
    Paramagnetic susceptibility of gases decreases with temperature.
    D.
    Paramagnetic susceptibility of gases permits the measurement of their concentration.

  13. The __________ of a vapor pressure thermometer is a functioning element.

  14. A.
    pointer
    B.
    bourdon tube
    C.
    bulb
    D.
    none of these

  15. A negative gain margin expressed in decibels means a/an __________ system.

  16. A.
    stable
    B.
    unstable
    C.
    critically damped
    D.
    none of these

  17. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

  18. A.
    insulator
    B.
    conductor
    C.
    solid semi-conductor
    D.
    liquid semi-conductor

  19. Flapper nozzle is used in a/an __________ controller.

  20. A.
    electronic
    B.
    hydraulic
    C.
    pneumatic
    D.
    none of these