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Home Chemical Engineering Process Control and Instrumentation Comments

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


  • Options
  • A. 0.2
  • B. 1.5
  • C. 4
  • D. 8

  • Correct Answer
  • 0.2 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Bode stability method uses __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. either (a) or (b)
    • D. neither (a) nor (b)
    • Discuss
    • 2. 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
    • 3. 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
    • 4. Polarisation of light forms the working principle of a

    • Options
    • A. polarimeter
    • B. polarograph
    • C. chromatograph
    • D. spectrometer
    • Discuss
    • 5. Which is the most suitable instrument for measuring pressure below 3 microns?

    • Options
    • A. Mcleoid gauge
    • B. Alphatron
    • C. Ionisation gauge
    • D. Bourdon guage
    • Discuss
    • 6. Liquid levels in autocalves are measued by

    • Options
    • A. simple float
    • B. differential float type manometer
    • C. glass gauge
    • D. none of these
    • Discuss
    • 7. 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
    • 8. 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
    • 9. Gas analysis is commonly done using the

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


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