Home / Chemical Engineering / Process Control and Instrumentation :: Section 1

Chemical Engineering :: Process Control and Instrumentation

  1. Typical specifications for design stipulates the gain margin and phase margin to be respectively

  2. A.
    > 1.7 and > 30°
    B.
    < 1.7 and > 30°
    C.
    < 1.7 and < 30°
    D.
    > 1.7 and < 30°

  3. Working principle of radiation pyrometer is based on the

  4. A.
    Wien's law
    B.
    Kirchoffs law
    C.
    Stafan-Boltzman law
    D.
    Seebeck effect

  5. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

  6. A.
    Peltier effect
    B.
    Thomson effect
    C.
    Seebeck effect
    D.
    none of these

  7. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

  8. A.
    Kelvin
    B.
    Centigrade
    C.
    Fahrenheit
    D.
    Reaumer

  9. In a single tank system, the transfer function of level to inlet flow rate is

  10. A.
    R/TS
    B.
    R/(TS + 1)
    C.
    l(TS + l)
    D.
    1/TS

  11. Which of the following is a desirable characteristic of an instrument ?

  12. A.
    High drift
    B.
    High fidelity
    C.
    High measuring lag
    D.
    Poor reproducibility

  13. The operation of a rotameter is based on

  14. A.
    variable flow area.
    B.
    rotation of a turbine.
    C.
    pressure drop across a nozzle.
    D.
    pressure at a stagnation point.

  15. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

  16. A.
    chromel-alumel
    B.
    iron-constantan
    C.
    platinum-platinum/rhodium
    D.
    none of these.

  17. Instrumentation in a plant offers the advantage of

  18. A.
    greater safety of operation
    B.
    better quality of product
    C.
    greater operation economy
    D.
    all (a), (b) and (c)

  19. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?

  20. A.
    Radiation/infrared pyrometer
    B.
    Filled system thermometer
    C.
    Mercury in glass thermometer
    D.
    Thermo electric pyrometer