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

  • 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

  • Correct Answer
  • < 1 

    • Process Control and Instrumentation problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Psychrometer determines the

    • Options
    • A. humidity of gases
    • B. moisture content of solids
    • C. water of crystallisation
    • D. hygroscopic nature of solids
      • Discuss
    • 4. Transfer functions X/Y for which of the following block diagrams is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 5. 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
    • 6. Alphatron measures pressure __________ microns.

    • Options
    • A. < 1
    • B. < 3
    • C. > 3
    • D. < 0.1
      • Discuss
    • 7. 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
    • 8. High temperature of around 2000°C of incandescent gas mantles is measured by a/an

    • Options
    • A. specially designed thermocouple.
    • B. optical pyrometer.
    • C. radiation pyrometer.
    • D. none of these.
      • Discuss
    • 9. The temperature range for which copper resistance thermometer can be used is __________ °C

    • Options
    • A. 0 to 150
    • B. -200 to 150
    • C. 350 to 750
    • D. 500 to 900
      • Discuss
    • 10. Reset rate is the another term used for __________ time.

    • Options
    • A. dead
    • B. integral
    • C. derivative
    • D. none of these
      • Discuss

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