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Chemical Engineering :: Process Control and Instrumentation

  1. Thermal conductivity measurement com-prises the working principle of a

  2. A.
    CO2 analyser
    B.
    polarimeter
    C.
    spectrometer
    D.
    chromatograph

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  3. Response of a system to a sinusoidal input is called __________ response.

  4. A.
    impluse
    B.
    unit step
    C.
    frequency
    D.
    none of these

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  5. The closed loop pole of a stable second order system could be

  6. A.
    both real and positive.
    B.
    complex conjugate with positive real parts.
    C.
    both real and negative.
    D.
    one real positive and the other real negative.

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  7. Smoke density of the flue gas going out of the chimney is measured by a

  8. A.
    polarograph
    B.
    thermal conductivity meter
    C.
    photo electric cell
    D.
    chromatograph

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  9. Transfer function of transportation lag is

  10. A.
    eTS
    B.
    e-TS
    C.
    D.
    none of these

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  11. Temperature measuring instruments are standardised mostly with __________ points of pure substances.

  12. A.
    melting
    B.
    boiling
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  13. Pick out the first order system from among the following.

  14. A.
    Damped vibrator.
    B.
    Mercury in glass thermometer kept in boiling water.
    C.
    Interacting system of two tanks in series.
    D.
    Non-interacting system of two tanks in series.

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  15. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

  16. A.
    250
    B.
    500
    C.
    750
    D.
    1000

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  17. Which of the following controllers has the least maximum deviation ?

  18. A.
    P-controller
    B.
    P-I controller
    C.
    P-I-D controller
    D.
    P-D controller

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  19. Volumetric expansion is the working principle of the __________ thermometers.

  20. A.
    mercury in glass
    B.
    constant volume gas
    C.
    vapor pressure
    D.
    bimetallic

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