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Chemical Engineering :: Process Control and Instrumentation

Process Control and Instrumentation - Section 1
Process Control and Instrumentation - Section 2
Process Control and Instrumentation - Section 3
Process Control and Instrumentation - Section 4
Process Control and Instrumentation - Section 5
Process Control and Instrumentation - Section 6
Process Control and Instrumentation - Section 7

  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

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

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

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

    4. 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).

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  4. Load cells are used for the measurement of

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

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

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

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  6. Pick out the wrong statement.

    7. 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.

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

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

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

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

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

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

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

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

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