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Process Control and Instrumentation problems

  • 1. 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
  • 2. Meleoid gauge measures the __________ pressure.

  • Options
  • A. positive
  • B. sub-atmospheric
  • C. very high
  • D. atmospheric
    • Discuss
  • 3. Phase margin is equal to

  • Options
  • A. 180° - phase lag
  • B. phase lag - 180°
  • C. phase lag + 180°
  • D. phase lag + 90°
    • Discuss
  • 4. Maximum differential pressure in liquid manometer is __________ psi.

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

  • Options
  • A. X
  • B. X2
  • C. 1/X
  • D. 1
    • Discuss
  • 6. 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
  • 7. 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
  • 8. 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.
    Chemical Engineering Process Control and Instrumentation: Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired

  • Options
  • A. Tank 1
  • B. Tank 2
  • C. Tank 3
  • D. Tank 4
    • Discuss
  • 9. Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

  • Options
  • A. Mercury in glass thermometer.
  • B. Alcohol in glass thermometer.
  • C. Fused metal (Na or K) in steel thermometer.
  • D. Nitrogen in steel thermometer.
    • Discuss
  • 10. Non-metallic diaphragm used as pressure sensor in instruments is generally made of

  • Options
  • A. teflon
  • B. synthetic rubber
  • C. bakelite
  • D. thick paper
    • Discuss

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