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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Liquid levels in autocalves are measued by


  • Options
  • A. simple float
  • B. differential float type manometer
  • C. glass gauge
  • D. none of these

  • Correct Answer
  • differential float type manometer 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Dead zone in an instrument must be less than __________ percent of the scale.

    • Options
    • A. 0.2
    • B. 1.5
    • C. 4
    • D. 8
    • Discuss
    • 2. Bode stability method uses __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. either (a) or (b)
    • D. neither (a) nor (b)
    • Discuss
    • 3. Flow rate through an orifice is __________ the pressure differential.

    • Options
    • A. proportional to
    • B. inversely proportional to the square root of
    • C. proportional to the square root of
    • D. inversely proportional to the square of
    • Discuss
    • 4. Working principle of radiation pyrometer is based on the

    • Options
    • A. Wien's law
    • B. Kirchoffs law
    • C. stefan-Boltzman law
    • D. Seebeck effect
    • Discuss
    • 5. Polarisation of light forms the working principle of a

    • Options
    • A. polarimeter
    • B. polarograph
    • C. chromatograph
    • D. spectrometer
    • Discuss
    • 6. Process degree of freedom indicates __________ number of controllers to be used.

    • Options
    • A. the maximum
    • B. the minimum
    • C. both maximum and the minimum
    • D. nothing about the
    • Discuss
    • 7. The transfer function of a pure dead time system with dead time ?d is

    • Options
    • A. 1/(?ds + 1)
    • B. ?ds + 1
    • C. e-?ss
    • D. e?ds
    • Discuss
    • 8. Gas analysis is commonly done using the

    • Options
    • A. thermal conductivity cell
    • B. X-ray diffraction
    • C. mass spectrometer
    • D. emission spectrometer
    • Discuss
    • 9. 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
    • 10. 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


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