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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Working principle of radiation pyrometer is based on the


  • Options
  • A. Wien's law
  • B. Kirchoffs law
  • C. stefan-Boltzman law
  • D. Seebeck effect

  • Correct Answer
  • stefan-Boltzman law 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Polarisation of light forms the working principle of a

    • Options
    • A. polarimeter
    • B. polarograph
    • C. chromatograph
    • D. spectrometer
    • Discuss
    • 2. 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
    • 3. Mercury manometer (U-tube type) exemplifies a __________ order system.

    • Options
    • A. zero
    • B. first
    • C. second
    • D. third
    • Discuss
    • 4. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

    • Options
    • A. Nickel
    • B. Brass
    • C. Chromel
    • D. Invar
    • Discuss
    • 5. Characteristic equation is the denominator of __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. both (a)and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 6. 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
    • 7. Bode stability method uses __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. either (a) or (b)
    • D. neither (a) nor (b)
    • Discuss
    • 8. 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
    • 9. Liquid levels in autocalves are measued by

    • Options
    • A. simple float
    • B. differential float type manometer
    • C. glass gauge
    • D. none of these
    • Discuss
    • 10. 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


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