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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • What is the dynamic error in a critically damped second order instrument for a ramp input (At)?


  • Options
  • A. 0.5 AT
  • B. 2 AT
  • C. AT
  • D. 1.5 AT

  • Correct Answer
  • 2 AT 


  • Process Control and Instrumentation problems


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    • 1. A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is

    • Options
    • A. 2/s
    • B.
    • C.
    • D.
    • Discuss
    • 2. Measurement of pressure in ammonia reactor is done by

    • Options
    • A. Bourdon gauge
    • B. U-tube manometer
    • C. Inclined tube manometer
    • D. Pirani guage
    • Discuss
    • 3. "A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.

    • Options
    • A. Bode stability
    • B. Nyquist
    • C. Routh stability
    • D. none of these
    • Discuss
    • 4. The __________ of a vapor pressure thermometer is a primary element.

    • Options
    • A. pointer
    • B. Bourdon tube
    • C. bulb
    • D. none of these
    • Discuss
    • 5. 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
    • 6. Which of the following is a 'contact' pyrometer?

    • Options
    • A. resistance pyrometer
    • B. optical pyrometer
    • C. radiation pyrometer
    • D. infra red pyrometer
    • Discuss
    • 7. On-off controllers are normally used for

    • Options
    • A. low loads
    • B. temperature changes
    • C. flow rate changes
    • D. none of these
    • Discuss
    • 8. Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

    • Options
    • A. ionisation
    • B. Pirani
    • C. Mcloid
    • D. none of these
    • Discuss
    • 9. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

    • Options
    • A. large area but small mass.
    • B. high thermal conductivity.
    • C. small specific heat.
    • D. all'a', 'b' & 'c'.
    • Discuss
    • 10. Pressure of 0.0001 absolute psi can be measured by __________ gauge.

    • Options
    • A. Mcloid
    • B. Pirani
    • C. thermocouple
    • D. none of these
    • Discuss


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