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Chemical Engineering :: Process Control and Instrumentation

  1. Which of the following thermometers is not suitable for distant reading upto 60 metres?

  2. A.
    Vapor pressure thermometer
    B.
    Mercury in glass thermometer
    C.
    Constant volume gas thermometer
    D.
    Resistance thermometer

  3. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

  4. A.
    speed of response
    B.
    reproducibility
    C.
    fidielity
    D.
    static characteristics

  5. Thermistors are made of

  6. A.
    ultra pure metals
    B.
    metal oxides
    C.
    iron-copper alloys
    D.
    nickel-chromium alloys

  7. A barometer measures the __________ pressure.

  8. A.
    absolute
    B.
    gauge
    C.
    absolute as well as gauge
    D.
    dynamic

  9. Humidity of air can be determined by a

  10. A.
    chromatograph
    B.
    sling psychrometer
    C.
    mass spectrometer
    D.
    polarimeter

  11. Thermocouple in a thermal well behaves as a true

  12. A.
    first order system.
    B.
    second order system (overdamped).
    C.
    multiple first order system.
    D.
    second order system (underdamped).

  13. The transfer function for a P-D controller is

  14. A.
    Kc(1+τD s)
    B.
    Kc(1 +1/τD s)
    C.
    Kc τD s
    D.
    KcD s

  15. Bode diagram is a plot of

  16. A.
    log (AR) vs. log (f) and (Φ) vs. log (f).
    B.
    log (AR) vs. f and log Φ vs.f.
    C.
    AR vs. log (f) and Φ vs. log (f).
    D.
    none of these.

  17. Working principle of disappearing filament type optical pyrometer is based on the

  18. A.
    Wien's law
    B.
    Seebeck effect
    C.
    Kirchoff's law
    D.
    Peltier effect

  19. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

  20. A.
    no change
    B.
    decrease
    C.
    increase
    D.
    exponential decrease