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

  • When a bare thermocouple is covered by a protective sheath, the response becomes


  • Options
  • A. faster and oscillatory.
  • B. faster and non-oscillatory.
  • C. slower and oscillatory.
  • D. slower and non-oscillatory.

  • Correct Answer
  • slower and non-oscillatory. 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Stability of a control system containing a transportation lag can be best analysed by

    • Options
    • A. Routh test
    • B. root locus methods
    • C. frequency response methods
    • D. none of these
      • Discuss
    • 2. The transfer function of a process is . If a step change is introduced into the system, then the response will be

    • Options
    • A. under damped
    • B. critically damped
    • C. over damped
    • D. none of these
      • Discuss
    • 3. Bode diagram are generated from output response of the system subjected to which of the following input?

    • Options
    • A. Impulse
    • B. Step
    • C. Ramp
    • D. Sinusoidal
      • Discuss
    • 4. A bolometer is

    • Options
    • A. used for the measurement of thermal radiation.
    • B. an element which senses optical input and delivers thermal output.
    • C. both (a) & (b).
    • D. neither (a) nor (b).
      • Discuss
    • 5. Which of the following is not a differential pressure flow meter?

    • Options
    • A. Rotameter
    • B. Flow nozzle
    • C. Orificemeter
    • D. Venturimeter
      • Discuss
    • 6. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

    • Options
    • A. making the volume of thermometer bulb as large as conveniently possible.
    • B. reducing the volume of the capillary to a minimum.
    • C. reducing the volume of the receiving element to a minimum.
    • D. all 'a', 'b' & 'c'.
      • Discuss
    • 7. Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

    • Options
    • A. antimony
    • B. gold
    • C. silver
    • D. nickel
      • Discuss
    • 8. Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

    • Options
    • A. 63.2
    • B. 87.5
    • C. 95
    • D. 100
      • Discuss
    • 9. Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

    • Options
    • A. increase of pressure
    • B. increase of thermal conductivity
    • C. volumetric expansion
    • D. differential linear expansion
      • Discuss
    • 10. The open loop transfer function of a process is . In the root locus diagram, the poles will be at

    • Options
    • A. -1, -4
    • B. 1, 4
    • C. -2, -3
    • D. 2, 3
      • Discuss

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