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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Pick out the first order system from among the following.


  • Options
  • A. Damped vibrator.
  • B. Mercury in glass thermometer kept in boiling water.
  • C. Interacting system of two tanks in series.
  • D. Non-interacting system of two tanks in series.

  • Correct Answer
  • Mercury in glass thermometer kept in boiling water. 


  • Process Control and Instrumentation problems


    Search Results


    • 1. __________ is undesirable in thermocouples used in industries,

    • Options
    • A. Linear relation of emf to temperature
    • B. Corrosion resistance
    • C. Oxidation resistance
    • D. Non-linear relation of emf to temperature
    • Discuss
    • 2. Typical specifications for design stipulates the gain margin and phase margin to be respectively

    • Options
    • A. > 1.7 and > 30°
    • B. < 1.7 and > 30°
    • C. < 1.7 and < 30°
    • D. > 1.7 and < 30°
    • Discuss
    • 3. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.

    • Options
    • A. load
    • B. controlled
    • C. manipulated
    • D. none of these
    • Discuss
    • 4. Pick out the one which is a first order instrument.

    • Options
    • A. Mercury in glass thermometer (without any covering or air gap).
    • B. Bare metallic thermometer.
    • C. Bare vapor pressure thermometer.
    • D. All (a), (b) and (c).
    • Discuss
    • 5. Temperature measuring instruments are standardised mostly with __________ points of pure substances.

    • Options
    • A. melting
    • B. boiling
    • C. both (a) & (b)
    • D. neither (a) nor (b)
    • Discuss
    • 6. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

    • Options
    • A. Kelvin
    • B. Centigrade
    • C. Fahrenheit
    • D. Reaumer
    • Discuss
    • 7. The function of a transducer is to

    • Options
    • A. modify the input signal.
    • B. amplify the input signal.
    • C. convert the primary signal into a more useful quantity, usually an electric impulse.
    • D. codify/decodify the input signal.
    • Discuss
    • 8. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

    • Options
    • A. chromel-alumel
    • B. iron-constantan
    • C. platinum-platinum/rhodium
    • D. none of these.
    • Discuss
    • 9. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

    • Options
    • A. Seebeck effect
    • B. Peltier effect
    • C. Joule heating effect
    • D. Thomson effect
    • Discuss
    • 10. Which of the following is not the triple point of water?

    • Options
    • A. 32°R
    • B. 273°K
    • C. 492°R
    • D. 32°F
    • Discuss


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