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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Zirconia probe is used for the measurement of


  • Options
  • A. humidity of air.
  • B. % CO2 in flue gas.
  • C. % O2 in flue gas.
  • D. speed of a submarine.

  • Correct Answer
  • % O2 in flue gas. 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Phase lag of the frequency response of a second order system to a sinusoidal forcing function

    • Options
    • A. is 30°
    • B. is 90° at the most
    • C. approaches 180° asymptotically
    • D. is 120°
    • Discuss
    • 2. Stalagmometer is used for the measurement of

    • Options
    • A. kinematic viscosity
    • B. surface tension
    • C. refractive index
    • D. optical activity
    • Discuss
    • 3. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

    • Options
    • A. d
    • B. d2
    • C. d3
    • D. d4
    • Discuss
    • 4. Thermistors are used in __________ devices.

    • Options
    • A. voltage measuring
    • B. temperature measuring
    • C. temperature compensating
    • D. both(b)&(c)
    • Discuss
    • 5. Which of following error integral is considered as the best criterion in controller settings?

    • Options
    • A.
    • B.
    • C.
    • D. none of these
    • Discuss
    • 6. Which of the following fluid flow measuring devices can measure the largest flow rate?

    • Options
    • A. V-notch
    • B. Rotameter
    • C. Orificemeter
    • D. Weir
    • Discuss
    • 7. Polarograph is meant for the analysis of

    • Options
    • A. gaseous mixture
    • B. miscible liquids
    • C. solids
    • D. isotopes
    • Discuss
    • 8. The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches

    • Options
    • A. -1
    • B. 0
    • C. 1
    • D. ?
    • Discuss
    • 9. E.m.f. generated by thermocouples is of the order of

    • Options
    • A. millivolts
    • B. microvolts
    • C. volts
    • D. kilo volts
    • Discuss
    • 10. Which of the following flow-metering instru-ments is an areameter?

    • Options
    • A. Venturimeter
    • B. Rotameter
    • C. Pitot tube
    • D. Hot wire anemometer
    • Discuss


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