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

  • Positioning controllers are used for


  • Options
  • A. low loads
  • B. temperature changes
  • C. high loads
  • D. flow rate changes

  • Correct Answer
  • high loads 

    • Process Control and Instrumentation problems

    Search Results

    • 1. The unit step response of the transfer functionreaches its final steady state assymptotically after

    • Options
    • A. a monotonic increase.
    • B. a monotonic decrease.
    • C. initially increasing and then decreasing.
    • D. increasing decreasing and then increasing.
      • Discuss
    • 2. The term analogous to the electrical current in a thermal system is the

    • Options
    • A. temperature difference
    • B. heat flow rate
    • C. heat content in the system
    • D. none of these
      • Discuss
    • 3. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

    • Options
    • A. linear
    • B. non-linear
    • C. parabolic
    • D. hyperbolic
      • Discuss
    • 4. Which of the following is not a speed measuring instrument?

    • Options
    • A. Psychrometer
    • B. Stroboscope
    • C. Tachometer
    • D. All (a), (b) and (c)
      • Discuss
    • 5. An amplitude ratio of 0.1 corresponds to __________ decibels.

    • Options
    • A. 20
    • B. -20
    • C. 10
    • D. -10
      • Discuss
    • 6. Which of the following judges the accuracy of an instrument?

    • Options
    • A. Dead zone
    • B. Drift
    • C. Static error
    • D. None of these
      • Discuss
    • 7. The amplitude ratio for the sinusoidal response of a __________ is 1.

    • Options
    • A. first order system
    • B. second order system
    • C. transportation lag
    • D. none of these
      • Discuss
    • 8. Paramagnetism method is not used for the composition determination of __________ in gases.

    • Options
    • A. oxygen
    • B. oxides of nitrogen
    • C. carbon dioxide
    • D. any of these
      • Discuss
    • 9. The unit step response of the transfer function 1/(s2 + 2s + 3)

    • Options
    • A. has a non-zero slope at the origin.
    • B. has a damped oscillatory characteristics.
    • C. is overdamped
    • D. is unstable
      • Discuss
    • 10. __________ thermometer can not measure sub-zero (< 0° C) temperature,

    • Options
    • A. Mercury in glass
    • B. Bimetallic
    • C. Vapor pressure
    • D. Resistance
      • Discuss

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