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Chemical Engineering :: Process Control and Instrumentation

  1. Thermistors are used in __________ devices.

  2. A.
    voltage measuring
    B.
    temperature measuring
    C.
    temperature compensating
    D.
    both(b)&(c)

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  3. __________ is the static characteristics of an instrument,

  4. A.
    Response
    B.
    Tine lag
    C.
    Drift
    D.
    dynamic error

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  5. Phase lag of the frequency response of a second order system to a sinusoidal forcing function

  6. A.
    is 30°
    B.
    is 90° at the most
    C.
    approaches 180° asymptotically
    D.
    is 120°

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  7. Dead zone in an instrument must be less than __________ percent of the scale.

  8. A.
    0.2
    B.
    1.5
    C.
    4
    D.
    8

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  9. Emission spectroscopy is used for

  10. A.
    solids and metal analysis.
    B.
    determining water purity.
    C.
    determination of CO2 in gases.
    D.
    NOxdetermination.

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  11. Gas analysis is commonly done using the

  12. A.
    thermal conductivity cell
    B.
    X-ray diffraction
    C.
    mass spectrometer
    D.
    emission spectrometer

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  13. The open loop transfer function of a control system is . This represents

  14. A.
    a first order system.
    B.
    dead time system.
    C.
    a first order time lag.
    D.
    a second order system.

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  15. Thermal conductivity measurement is used for the determination of

  16. A.
    O2 percentage in the flue gas.
    B.
    specific gravity of petrofuels.
    C.
    composition of an alloy.
    D.
    CO2 percentage in the flue gas.

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  17. Presence of a small amount of water in the organic systems can be determined by the __________ method.

  18. A.
    electrical conductivity
    B.
    polarimetry
    C.
    emission spectroscopy
    D.
    dielectric constant end loss factor

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  19. The transfer function of a pure dead time system with dead time τd is

  20. A.
    1/(τds + 1)
    B.
    τds + 1
    C.
    ess
    D.
    eτds

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