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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Use of I-control along with P-control facilitates


  • Options
  • A. elimination of offset
  • B. reduction of offset
  • C. reduction of stability time
  • D. none of these

  • Correct Answer
  • elimination of offset 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Which of the systems having the following transfer function is stable?

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 2. Turbine flow meters are suitable for

    • Options
    • A. very limited flow ranges.
    • B. cryogenic flow measurements.
    • C. aerospace and in air borne applications.
    • D. both (b) and (c).
    • Discuss
    • 3. The calibration data of a thermocouple with its cold junction at 0°C are given below.

      The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple?

    • Options
    • A. 3.26 mv
    • B. 0.80 mv
    • C. 2.46 mv
    • D. 2.43 mv
    • Discuss
    • 4. Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

    • Options
    • A. low thermal conductivity.
    • B. low electrical conductivity.
    • C. high viscosity index.
    • D. low flash point.
    • Discuss
    • 5. Starting temperature of optical radiation pyrometer is __________ °C.

    • Options
    • A. 800
    • B. 400
    • C. 1200
    • D. 1500
    • Discuss
    • 6. The transfer function for a first order process with time delay is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 7. Liquid discharge from a tank or reservoir can not be measured by

    • Options
    • A. orificemeters
    • B. weirs
    • C. mouthpieces
    • D. notches
    • Discuss
    • 8. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function

    • Options
    • A. e-?s
    • B.
    • C.
    • D.
    • Discuss
    • 9. A mercury barometer measures the __________ pressure.

    • Options
    • A. atmospheric
    • B. gauge
    • C. vacuum
    • D. absolute
    • Discuss
    • 10. __________ are analysed using a polarograph.

    • Options
    • A. Isotonic solutions
    • B. Solids
    • C. Liquids
    • D. Gases
    • Discuss


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