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  • Question

  • According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is


  • Options
  • A. 0°
  • B. 45°
  • C. 90°
  • D. 180°

  • Correct Answer
  • 180° 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.

    • Options
    • A. Peltier
    • B. Thomson
    • C. Seebeck
    • D. none of these
      • Discuss
    • 3. Thermocouple in a thermal well behaves as a true

    • Options
    • A. first order system.
    • B. second order system (overdamped).
    • C. multiple first order system.
    • D. second order system (underdamped).
      • Discuss
    • 4. The transfer function for an ideal proportional plus reset controller (reset time T) is

    • Options
    • A.
    • B. Kc(1 + TS)
    • C.
    • D.
      • Discuss
    • 5. Thermodynamic celcius scale of temperature measurement is

    • Options
    • A. defined on the basis of melting point of ice and evaporation temperature of water vapor.
    • B. defined on the basis of melting point of ice and condensation temperature of water vapor.
    • C. having an interval of 100° between ice point to steam point.
    • D. both (b) and (c)
      • Discuss
    • 6. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

    • Options
    • A. magnetic flowmeter
    • B. pitot tube
    • C. flow nozzle type flowmeter
    • D. turbine flowmeter
      • Discuss
    • 7. The fluid used in hydraulic controller is

    • Options
    • A. water
    • B. steam
    • C. air
    • D. oil
      • Discuss
    • 8. Feed forward controller accounts for the __________ changes.

    • Options
    • A. set point
    • B. load
    • C. both (a) & (b)
    • D. neither (a) nor (b)
      • Discuss
    • 9. Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.

    • Options
    • A. mercury thermometer
    • B. bimetallic thermometer
    • C. radiation pyrometer
    • D. none of these
      • Discuss
    • 10. The __________ of a vapor pressure thermometer is a primary element.

    • Options
    • A. pointer
    • B. Bourdon tube
    • C. bulb
    • D. none of these
      • Discuss

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