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Chemical Engineering :: Process Control and Instrumentation

  1. Identify an unbounded input from inputs whose transfer functions are given below

  2. A.
    1
    B.
    1/S
    C.
    1/S2
    D.
    1/(S2 + 1)

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  3. "A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.

  4. A.
    Bode stability
    B.
    Nyquist
    C.
    Routh stability
    D.
    none of these

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  5. Feed forward controller accounts for the __________ changes.

  6. A.
    set point
    B.
    load
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  7. Which thermocouple can be used to measure a temperature of around 1400°C ?

  8. A.
    Copper-constantan
    B.
    Aluminium-chromel
    C.
    Platinum-platinum+rhodium
    D.
    None of these

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  9. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?

  10. A.
    Mercury in glass thermometer
    B.
    Mercury in steel thermometer
    C.
    Alcohol in glass thermometer
    D.
    Fused metal (Na or K) in steel thermometer

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  11. Concentration of sugar solution can be determined by the

  12. A.
    polarimetry
    B.
    flame photometry
    C.
    emission spectroscopy
    D.
    oscillometry

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  13. In a single tank system, the transfer function of __________ to inlet flow rate is 1/TS+1.

  14. A.
    outlet flow rate
    B.
    level
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  15. Which of the following can not measure a temperature of 1600°C ?

  16. A.
    Platinum resistance thermometer
    B.
    Thermocouple
    C.
    Photo-electric pyrometer
    D.
    Radiation pyrometer

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