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Process Control and Instrumentation problems

  • 1. Which of the following thermocouples has the least temperature measurement range?

  • Options
  • A. Copper-constantan
  • B. Chromel-alumel
  • C. Platinum-platinum/rhodium
  • D. Iron-constantan
    • Discuss
  • 2. Continuous measurement of moisture content of paper in paper industry is done by measuring the

  • Options
  • A. thermal conductivity through the paper
  • B. electrical resistance through the paper
  • C. magnetic susceptibility
  • D. none of these
    • Discuss
  • 3. Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

  • Options
  • A. steel
  • B. vycor (a glass)
  • C. nichrome
  • D. inconel
    • Discuss
  • 4. Working principle of mercury in glass thermometer is

  • Options
  • A. volumetric expansion.
  • B. pressure rise with temperature.
  • C. linear expansion.
  • D. none of these.
    • Discuss
  • 5. Composition of natural gas is determined by the

  • Options
  • A. Haldane apparatus
  • B. mass spectrometer
  • C. chromatograph
  • D. both (b) and (c)
    • Discuss
  • 6. Which is the strongest paramagnetic gas?

  • Options
  • A. CO2
  • B. O2
  • C. NO
  • D. NO2
    • Discuss
  • 7. Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

  • Options
  • A. Chromel-alumel
  • B. Iron-constantan
  • C. Platinum-platinum + rhodium
  • D. Copper-constantan
    • Discuss
  • 8. Phase lag of the sinusoidal response of a first order system is

  • Options
  • A. 120°
  • B. 30°
  • C. 180°
  • D. 90°
    • Discuss
  • 9. Which of the following can measure temperatures in the range of - 20 to 300°C?

  • Options
  • A. Mercury in glass thermometer
  • B. Vapor pressure thermometer
  • C. Resistance thermometer
  • D. None of these.
    • Discuss
  • 10. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function Chemical Engineering Process Control and Instrumentation: The root locus plot of the roots of the characteristics equation of a closed loop system having the will have a definite num-ber of loci for variation of K from 0 to ?. The number of loci is

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

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