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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • The frequency response of a first order system, has a phase shift with lower and upper bounds given by


  • Options
  • A. - ?, ?/2
  • B. -?/2, ?/2
  • C. -?/2, 0
  • D. 0, ?/2

  • Correct Answer
  • 0, ?/2 


  • Process Control and Instrumentation problems


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    • 1. Specific gravity of a liquid can not be measured by a/an

    • Options
    • A. anemometer
    • B. specific gravity bottle
    • C. pycnometer
    • D. hydrometer
    • Discuss
    • 2. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

    • Options
    • A. no change
    • B. decrease
    • C. increase
    • D. exponential decrease
    • Discuss
    • 3. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

    • Options
    • A. 0-100
    • B. < 0
    • C. > 100.
    • D. > 50
    • Discuss
    • 4. Concentration of sugar solution can be determined by the

    • Options
    • A. polarimetry
    • B. flame photometry
    • C. emission spectroscopy
    • D. oscillometry
    • Discuss
    • 5. Humidity of air can be determined by a

    • Options
    • A. chromatograph
    • B. sling psychrometer
    • C. mass spectrometer
    • D. polarimeter
    • Discuss
    • 6. Which of the following can not measure a temperature of 1600°C?

    • Options
    • A. Platinum resistance thermometer
    • B. Thermocouple
    • C. Photo-electric pyrometer
    • D. Radiation pyrometer
    • Discuss
    • 7. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

    • Options
    • A. speed of response
    • B. reproducibility
    • C. fidielity
    • D. static characteristics
    • Discuss
    • 8. The transfer function for a P-D controller is

    • Options
    • A. Kc(1+?D s)
    • B. Kc(1 +1/?D s)
    • C. Kc ?D s
    • D. Kc/?D s
    • Discuss
    • 9. Flow rate of a river is measured by a/an

    • Options
    • A. pitot tube
    • B. vane meter
    • C. kennison nozzle
    • D. open weir
    • Discuss
    • 10. Dead zone is the

    • Options
    • A. same as time constant.
    • B. same as transportation lag.
    • C. maximum change in the variable that does not change the reading of the instrument.
    • D. none of these.
    • Discuss


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