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

  • Psychrometer determines the


  • Options
  • A. humidity of gases
  • B. moisture content of solids
  • C. water of crystallisation
  • D. hygroscopic nature of solids

  • Correct Answer
  • humidity of gases 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Transfer functions X/Y for which of the following block diagrams is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 2. Pirani gauge is used for the measurement of

    • Options
    • A. very high pressure.
    • B. high vacuum.
    • C. liquid level under pressure.
    • D. liquid level at atmospheric pressure
      • Discuss
    • 3. Which of the following is not a mechanical pressure sensing element?

    • Options
    • A. Bellows
    • B. Diaphragm
    • C. Bourdon tube
    • D. U-tube
      • Discuss
    • 4. Measurement of sub-zero Celcius temperature in industry is done most commonly by

    • Options
    • A. thermocouples
    • B. resistance thermometers
    • C. gas thermometers
    • D. bi-metallic thermometers
      • Discuss
    • 5. __________ are analysed using a polarograph.

    • Options
    • A. Isotonic solutions
    • B. Solids
    • C. Liquids
    • D. Gases
      • Discuss
    • 6. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system

    • Options
    • A. depends only upon the open loop transfer function.
    • B. determines its stability.
    • C. is the same for set point or load changes.
    • D. all 'a', 'b' & 'c'
      • Discuss
    • 7. The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below :

      The appropriate transfer function of the process is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

    • Options
    • A. 1
    • B. >1
    • C. < 1
    • D. none of these
      • Discuss
    • 9. Alphatron measures pressure __________ microns.

    • Options
    • A. < 1
    • B. < 3
    • C. > 3
    • D. < 0.1
      • Discuss
    • 10. Which of the systems having following transfer functions is stable?

    • Options
    • A. 1/(s2+ 2)
    • B. 1/(s2-2s + 3)
    • C. 1/(s2 + 2s + 2)
    • D. exp(-20s)/(s2 + 2s-l)
      • Discuss

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