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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • The closed loop pole of a stable second order system could be


  • Options
  • A. both real and positive.
  • B. complex conjugate with positive real parts.
  • C. both real and negative.
  • D. one real positive and the other real negative.

  • Correct Answer
  • both real and negative. 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Pick out the wrong statement.

    • Options
    • A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
    • B. CO2 is the strongest paramagnetic gas.
    • C. Paramagnetic susceptibility of gases decreases with temperature.
    • D. Paramagnetic susceptibility of gases permits the measurement of their concentration.
    • Discuss
    • 2. The __________ of a vapor pressure thermometer is a secondary element.

    • Options
    • A. pointer
    • B. Bourdon tube
    • C. bulb
    • D. none ofthese
    • Discuss
    • 3. The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the derivative time.)

    • Options
    • A. Kc(1 + ?is + ?D ). s
    • B.
    • C.
    • D.
    • Discuss
    • 4. Smoke density of the flue gas going out of the chimney is measured by a

    • Options
    • A. polarograph
    • B. thermal conductivity meter
    • C. photo electric cell
    • D. chromatograph
    • Discuss
    • 5. Which of the following measurements can be made by the measurement of emf?

    • Options
    • A. pH value
    • B. Degree of hydrolysis
    • C. Composition of complex ions
    • D. All (a), (b) & (c)
    • Discuss
    • 6. Working principle of radiation pyrometer is based on the

    • Options
    • A. Wien's law
    • B. Kirchoffs law
    • C. Stafan-Boltzman law
    • D. Seebeck effect
    • Discuss
    • 7. A magnetic flowmeter is

    • Options
    • A. based on the principle of Faraday's law.
    • B. capable of measuring the flow rate of slurries and electrolytes.
    • C. based on the linear relationship between the fluid flow rate and the induced voltage.
    • D. all (a), (b) and (c).
    • Discuss
    • 8. In a single tank system, the transfer function of level to inlet flow rate is

    • Options
    • A. R/TS
    • B. R/(TS + 1)
    • C. l(TS + l)
    • D. 1/TS
    • Discuss
    • 9. Volumetric expansion is the working principle of the __________ thermometers.

    • Options
    • A. mercury in glass
    • B. constant volume gas
    • C. vapor pressure
    • D. bimetallic
    • Discuss
    • 10. Nichol's chart deals with

    • Options
    • A. A.R. vs. phase lag of first order.
    • B. A.R. vs. phase lag of second order.
    • C. closed loop values vs. open loop values.
    • D. frequency response values of controllers.
    • Discuss


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