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Home Chemical Engineering Process Control and Instrumentation Comments

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


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

  • Correct Answer
  • Bourdon tube 


  • Process Control and Instrumentation problems


    Search Results


    • 1. __________ controller has the maximum stabilising time.

    • Options
    • A. P
    • B. PD
    • C. PI
    • D. PID
    • Discuss
    • 2. For a feed back control system to be stable, the

    • Options
    • A. roots of the characteristic equation should be real.
    • B. poles of the closed loop transfer function should lie in the left half of the complex plane.
    • C. Bode plots of the corresponding open loop transfer function should monotoni-cally decrease.
    • D. poles of the closed loop transfer function should lie in the right half of the complex plane.
    • Discuss
    • 3. 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

    • Options
    • A. 8, 0.6, 0.08
    • B. 12, 0.6, 0.12
    • C. 8, 0.6, 0.12
    • D. 12, 0.4, 0.08
    • Discuss
    • 4. A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same

    • Options
    • A. temperature measuring range (- 40°C to 450°C).
    • B. accuracy (± 1% of span).
    • C. speed of response.
    • D. all a, b & c.
    • Discuss
    • 5. Gas analysis is commonly done using the

    • Options
    • A. thermal conductivity cell
    • B. X-ray diffraction
    • C. mass spectrometer
    • D. emission spectrometer
    • Discuss
    • 6. Flow rate of sludge is not measured by a/an

    • Options
    • A. orificemeter
    • B. open weir
    • C. kennison nozzle
    • D. both(b)&(c)
    • Discuss
    • 7. Which of the following is not a second order instrument?

    • Options
    • A. Mercury in glass thermometer with covering.
    • B. Bare mercury in glass thermometer.
    • C. Pressure gauge with one bellow, two tubes and a tank.
    • D. None of these.
    • Discuss
    • 8. Thermal wells used in temperature measurements should have

    • Options
    • A. very thick walls.
    • B. low emissivity.
    • C. polished surface.
    • D. high transmissivity of radiation.
    • Discuss
    • 9. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.

    • Options
    • A. load
    • B. manipulated
    • C. controlled
    • D. none of these
    • Discuss
    • 10. Out of the following themocouple wire insulating material, the highest temperature rating is for

    • Options
    • A. teflon
    • B. ceramic fibre
    • C. asbestos
    • D. fibre glass
    • Discuss


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