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

  • Phase margin is equal to


  • Options
  • A. 180° - phase lag
  • B. phase lag - 180°
  • C. phase lag + 180°
  • D. phase lag + 90°

  • Correct Answer
  • 180° - phase lag 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Meleoid gauge measures the __________ pressure.

    • Options
    • A. positive
    • B. sub-atmospheric
    • C. very high
    • D. atmospheric
      • Discuss
    • 2. Cascade control means

    • Options
    • A. feed forward control.
    • B. more than one feed-back loop.
    • C. on-off control.
    • D. one feed-back loop.
      • Discuss
    • 3. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

    • Options
    • A. Mercury thermometer
    • B. Radiation pyrometer
    • C. Bimetallic thermometer
    • D. Thermocouple
      • Discuss
    • 4. Response of a linear control system for a change in set point is called

    • Options
    • A. frequency response
    • B. transient response
    • C. servo problem
    • D. regulator problem
      • Discuss
    • 5. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

    • Options
    • A. w = 1/14, Kc = 45/714
    • B. w = 7/6, Kc = 46/3
    • C. w = 1, Kc = 13
    • D. w = 7/8, Kc = 45/4
      • Discuss
    • 6. Maximum differential pressure in liquid manometer is __________ psi.

    • Options
    • A. 20
    • B. 30
    • C. 40
    • D. 50
      • Discuss
    • 7. What is the Laplace transform of impulse input having magnitude 'X'?

    • Options
    • A. X
    • B. X2
    • C. 1/X
    • D. 1
      • Discuss
    • 8. Which of the following is not classified as a thermo electric pyrometer?

    • Options
    • A. Resistance thermometer.
    • B. Thermocouple.
    • C. Optical pyrometer (disappearing filament type)
    • D. Radiation pyrometer
      • Discuss
    • 9. Liquid flow rate in an open channel can not be measured by a/an

    • Options
    • A. orifice meter
    • B. cipolletti weir
    • C. rectangular weir
    • D. V-notch
      • Discuss
    • 10. Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop.

    • Options
    • A. Tank 1
    • B. Tank 2
    • C. Tank 3
    • D. Tank 4
      • Discuss

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