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  • Question

  • __________ stability method uses open loop transfer function.


  • Options
  • A. Nyquist
  • B. Mikhalov
  • C. Ruth
  • D. none of these

  • Correct Answer
  • Nyquist 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as :

    • Options
    • A. Q0(T0 - T) = Ac .
    • B. Q0T0 - QT = Ac .
    • C. Q(T0 - T) = Ac .
    • D. Q(T0 - T) = Ac .
      • Discuss
    • 2. Optical activity of a solution can be determined using a

    • Options
    • A. polarimeter
    • B. polarograph
    • C. dilatometer
    • D. refractrometer
      • Discuss
    • 3. The transfer function of a first order system is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 4. Dilatometer is used to measure

    • Options
    • A. stress
    • B. strain
    • C. deflection
    • D. contraction/expansion due to changes in temperature
      • Discuss
    • 5. The inverse Laplace transform of the function is

    • Options
    • A. 1 + et
    • B. 1 - et
    • C. 1 + e-t
    • D. 1 - e-t
      • Discuss
    • 6. Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

    • Options
    • A. CO2
    • B. N2
    • C. O2
    • D. CO
      • Discuss
    • 7. The transfer function of a second order system is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 8. Emf generated in a thermocouple depends on the temperature

    • Options
    • A. of cold junction only.
    • B. of hot junction only.
    • C. difference between hot and cold junctions.
    • D. difference between cold junction and atmospheric temperature.
      • Discuss
    • 9. A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

    • Options
    • A. 45°
    • B. -90°
    • C. -180°
    • D. -45°
      • Discuss
    • 10. A system with a double pole at the origin is unstable since the corresponding term in the time domain

    • Options
    • A. is a constant.
    • B. grows exponentially with time.
    • C. grows linearly with time.
    • D. decays linearly with time.
      • Discuss

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