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Chemical Engineering :: Process Control and Instrumentation

  1. Thermal conductivity cell is the primary element of a/an __________ analyser.

  2. A.
    oxygen
    B.
    carbon dioxide
    C.
    carbon monoxide
    D.
    sulphur dioxide

  3. Zirconia probe is used for the measurement of

  4. A.
    humidity of air.
    B.
    % CO2 in flue gas.
    C.
    % O2 in flue gas.
    D.
    speed of a submarine.

  5. __________ type of element is normally not used in the bimetallic thermometers.

  6. A.
    Flat spiral
    B.
    Bourdon tube
    C.
    Single helix
    D.
    Multiple helix

  7. Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as

  8. A.
    8, 0.6, 0.08
    B.
    12, 0.6, 0.12
    C.
    8, 0.6, 0.12
    D.
    12, 0.4, 0.08

  9. Process degree of freedom indicates __________ number of controllers to be used.

  10. A.
    the maximum
    B.
    the minimum
    C.
    both maximum and the minimum
    D.
    nothing about the

  11. Characteristic equation is the denominator of __________ loop transfer function.

  12. A.
    open
    B.
    closed
    C.
    both (a)and (b)
    D.
    neither (a) nor (b)

  13. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

  14. A.
    radiation
    B.
    optical
    C.
    photoelectric
    D.
    none of these

  15. Polarograph is meant for the analysis of

  16. A.
    gaseous mixture
    B.
    miscible liquids
    C.
    solids
    D.
    isotopes

  17. Which of the following fluid flow measuring devices can measure the largest flow rate ?

  18. A.
    V-notch
    B.
    Rotameter
    C.
    Orificemeter
    D.
    Weir

  19. Flow rate of sludge is not measured by a/an

  20. A.
    orificemeter
    B.
    open weir
    C.
    kennison nozzle
    D.
    both(b)&(c)