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  • Question

  • Routh test


  • Options
  • A. criterion provides information about the actual location of roots.
  • B. cannot be used to test the stability of a control system containing transportation lag.
  • C. criterion is not applicable to systems with polynomial characteristic equation.
  • D. can not determine as to how many roots of the characteristics equation have positive real roots.

  • Correct Answer
  • cannot be used to test the stability of a control system containing transportation lag. 

    • Process Control and Instrumentation problems

    Search Results

    • 1. To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

    • Options
    • A. air
    • B. a metal powder or graphite
    • C. oil
    • D. mercury
      • Discuss
    • 2. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

    • Options
    • A. Platinum-platinum + rhodium
    • B. Iron-constantan
    • C. Copper-constantan
    • D. Chromel-alumel
      • Discuss
    • 3. Thermal wells are used in the temperature measurement to

    • Options
    • A. guard against corrosive and oxidising action on thermocouple materials
    • B. reduce measuring lag.
    • C. increase the fidelity.
    • D. increase the sensitivity.
      • Discuss
    • 4. Radiation thermometer can not measure the temperature

    • Options
    • A. inside a pressure vessel.
    • B. of an object without coming in contact with it.
    • C. of liquid oxygen.
    • D. of moving objects at high temperature.
      • Discuss
    • 5. pH meter has

    • Options
    • A. one cell
    • B. two cells
    • C. three cells
    • D. no cell
      • Discuss
    • 6. Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

    • Options
    • A. CO2
    • B. O2
    • C. NO
    • D. NO2
      • Discuss
    • 7. Number of poles in a system with transfer function is

    • Options
    • A. 2
    • B. 5
    • C. 3
    • D. 1
      • Discuss
    • 8. The Laplace transform of a sinusoidal function (eg; sin at) is represented by the curve

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. Mass spectrometer is used for the composition analysis of

    • Options
    • A. alloys
    • B. solids
    • C. isotopes
    • D. none of these
      • Discuss
    • 10. A typical example of a physical system with under damped characteristic is a

    • Options
    • A. U-tube manometer.
    • B. spring loaded diaphragm valve.
    • C. CSTR with first order reaction.
    • D. thermocouple kept immersed in a liquid filled thermowell.
      • Discuss

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