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Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
  • Question

  • Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are


  • Options
  • A. air to open valve with the controller direct acting.
  • B. air to close valve with the controller indirect acting.
  • C. air to open valve with the controller indirect acting.
  • D. air to close valve with the controller direct acting.

  • Correct Answer
  • air to open valve with the controller indirect acting. 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Bimetal strips are not used in

    • Options
    • A. bimetallic thermometers.
    • B. thermocouples.
    • C. thermostats.
    • D. relays for opening & closing of electrical circuits.
      • Discuss
    • 2. Block diagram of a simple standard control system is shown below in the figure.

      Which of the following statement about the above control system is wrong?

    • Options
    • A. The transfer functions of the measuring element and the process is represent by H and G2 respectively
    • B. The overall transfer function for the change in load (X = 0) is given by
    • C. The overall transfer function for the change in set point (X1 = 0) is given by
    • D. Manipulated variable is represented by C.
      • Discuss
    • 3. Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.

    • Options
    • A. 961.93
    • B. 630.74
    • C. 1064.43
    • D. 1261.93
      • Discuss
    • 4. Silver point temperature is __________ °C.

    • Options
    • A. 760.5
    • B. 860.5
    • C. 960.5
    • D. 1060.5
      • Discuss
    • 5. "An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a

    • Options
    • A. pH meter
    • B. polarimeter
    • C. chromatograph
    • D. polarograph
      • Discuss
    • 6. Mcleoid gauge is used to measure the

    • Options
    • A. point velocity
    • B. flow rate
    • C. vacuum
    • D. pressure
      • Discuss
    • 7. A non-linear system will have __________ steady state values.

    • Options
    • A. one
    • B. more than one
    • C. two
    • D. three
      • Discuss
    • 8. Which of the following thermocouples is capable of measuring a temperature of -50°C?

    • Options
    • A. Platinum - platinum + rhodium
    • B. Chromel - alumel
    • C. Iron-constantan
    • D. Copper - constantan
      • Discuss
    • 9. Photoelectric pyrometers are suitable in the temperature range of __________ °C.

    • Options
    • A. 400-1600
    • B. 800-1600
    • C. 800-2500
    • D. 400-1000
      • Discuss
    • 10. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since

    • Options
    • A. the function is exponential.
    • B. the Laplace transform of integral of exp(at) has finite values only for s > a.
    • C. the Laplace transform integral of exp(at) has initial values only for s > a.
    • D. the function exp(at) is piece-wise continuous only for s > a.
      • Discuss

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