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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Emission spectroscopy is used for


  • Options
  • A. solids and metal analysis.
  • B. determining water purity.
  • C. determination of CO2 in gases.
  • D. NOxdetermination.

  • Correct Answer
  • solids and metal analysis. 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Thermal conductivity measurement is used for the determination of

    • Options
    • A. O2 percentage in the flue gas.
    • B. specific gravity of petrofuels.
    • C. composition of an alloy.
    • D. CO2 percentage in the flue gas.
    • Discuss
    • 2. Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm3.

    • Options
    • A. 50
    • B. 100
    • C. 10
    • D. 1
    • Discuss
    • 3. Time constant is the

    • Options
    • A. time taken by the controlled variable to reach 63.2% of its full change.
    • B. same as transportation lag.
    • C. same as dead time.
    • D. time required by the measured variable to reach 63.2% of its ultimate change.
    • Discuss
    • 4. Routh stability method uses __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. either (a) or (b)
    • D. neither (a) nor (b)
    • Discuss
    • 5. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

    • Options
    • A. chromel-alumel
    • B. iron-constantan
    • C. platinum-rhodium
    • D. platinum-platinum+rhyodium
    • Discuss
    • 6. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

    • Options
    • A. radiation
    • B. optical
    • C. photoelectric
    • D. none of these
    • Discuss
    • 7. 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
    • 8. 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
    • 9. Mercury manometer (U-tube type) exemplifies a __________ order system.

    • Options
    • A. zero
    • B. first
    • C. second
    • D. third
    • Discuss
    • 10. 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


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