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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)

  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

  5. Feed forward controller accounts for the __________ changes.

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

  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

  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

  11. Concentration of sugar solution can be determined by the

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

  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)

  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