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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Which of the following is not the triple point of water?


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

  • Correct Answer
  • 32°R 


  • Process Control and Instrumentation problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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.
    • Discuss
    • 6. Which of the following is an undesirable dynamic characteristic of an instrument?

    • Options
    • A. Reproducibility
    • B. Dead zone
    • C. Time lag
    • D. Static error
    • Discuss
    • 7. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

    • Options
    • A. Platinum-platinum + rhodium.
    • B. Iron-constantan.
    • C. Chromel-constantan.
    • D. All will give the same output.
    • Discuss
    • 8. Which of the following controllers has the least maximum deviation?

    • Options
    • A. P-controller
    • B. P-I controller
    • C. P-I-D controller
    • D. P-D controller
    • Discuss
    • 9. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?

    • Options
    • A. Peltier effect
    • B. Thomson effect
    • C. Seebeck effect
    • D. none of these
    • Discuss
    • 10. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

    • Options
    • A. insulator
    • B. conductor
    • C. solid semi-conductor
    • D. liquid semi-conductor
    • Discuss


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