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  • Question
  • 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.

  • Correct Answer
  • Chromel-constantan. 


  • Process Control and Instrumentation problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Which of the following is a desirable characteristic of an instrument?

    • Options
    • A. High drift
    • B. High fidelity
    • C. High measuring lag
    • D. Poor reproducibility
    • Discuss
    • 10. Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

    • Options
    • A. oxygen in
    • B. carbon dioxide in
    • C. carbon monoxide in
    • D. temperature of
    • Discuss


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