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Chemical Engineering :: Process Control and Instrumentation

  1. The response of two tanks of same size and resistance in series is

  2. A.
    under damped
    B.
    critically damped
    C.
    over damped
    D.
    none of the above

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  3. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function

  4. A.
    es
    B.
    C.
    D.

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  5. The amplitude ratio for the sinusoidal response of __________ is < 1.

  6. A.
    transportation lag
    B.
    first order system
    C.
    second order system
    D.
    none of these

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  7. Which of the following is a 'contact' pyrometer ?

  8. A.
    resistance pyrometer
    B.
    optical pyrometer
    C.
    radiation pyrometer
    D.
    infra red pyrometer

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  9. Which of the following is not a speed measuring instrument ?

  10. A.
    Psychrometer
    B.
    Stroboscope
    C.
    Tachometer
    D.
    All (a), (b) and (c)

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  11. Measurement of sub-zero Celcius temperature in industry is done most commonly by

  12. A.
    thermocouples
    B.
    resistance thermometers
    C.
    gas thermometers
    D.
    bi-metallic thermometers

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  13. For the block diagram shown below :

    The characteristic equation is

  14. A.
    τl Sps + 1) + Kc . KplS + 1) ed s = 0
    B.
    mS + 1) (τpS + 1) + Km . Kp ed S = 0
    C.
    τl Sm S + 1) (τp S + 1) +Kc . Kp . Kml s + 1) edS = 0
    D.
    ms + 1) (τp s + 1) + Kc . Kp . Km . edS = 0

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  15. Use of I-control along with P-control facilitates

  16. A.
    elimination of offset
    B.
    reduction of offset
    C.
    reduction of stability time
    D.
    none of these

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  17. Turbine flow meters are suitable for

  18. A.
    very limited flow ranges.
    B.
    cryogenic flow measurements.
    C.
    aerospace and in air borne applications.
    D.
    both (b) and (c).

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  19. Liquid discharge from a tank or reservoir can not be measured by

  20. A.
    orificemeters
    B.
    weirs
    C.
    mouthpieces
    D.
    notches

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