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Chemical Engineering :: Process Control and Instrumentation

  1. A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is

  2. A.
    2/s
    B.
    C.
    D.

  3. The term analogous to the electrical current in a thermal system is the

  4. A.
    temperature difference
    B.
    heat flow rate
    C.
    heat content in the system
    D.
    none of these

  5. Reset rate is the another term used for __________ time.

  6. A.
    dead
    B.
    integral
    C.
    derivative
    D.
    none of these

  7. Continuous measurement of moisture in paper is done by

  8. A.
    sling psychrometer.
    B.
    hair-hygrometer.
    C.
    weighing.
    D.
    high resistance Wheatstone's bridge circuit.

  9. Psychrometer determines the

  10. A.
    humidity of gases
    B.
    moisture content of solids
    C.
    water of crystallisation
    D.
    hygroscopic nature of solids

  11. Which of the systems having the following transfer function is stable ?


  12. The calibration data of a thermocouple with its cold junction at 0°C are given below.

    The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple ?

  13. A.
    3.26 mv
    B.
    0.80 mv
    C.
    2.46 mv
    D.
    2.43 mv

  14. A mercury barometer measures the __________ pressure.

  15. A.
    atmospheric
    B.
    gauge
    C.
    vacuum
    D.
    absolute

  16. Positioning controllers are used for

  17. A.
    low loads
    B.
    temperature changes
    C.
    high loads
    D.
    flow rate changes

  18. The amplitude ratio for the sinusoidal response of a __________ is 1.

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