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  • Question

  • Which of the following thermocouples has the widest temperature measurement range?


  • Options
  • A. Iron-constantan
  • B. Chromel-alumel
  • C. Copper-constantan
  • D. Platinum-platinum/rhodium

  • Correct Answer
  • Platinum-platinum/rhodium 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Non-metallic diaphragm used as pressure sensor in instruments is generally made of

    • Options
    • A. teflon
    • B. synthetic rubber
    • C. bakelite
    • D. thick paper
      • Discuss
    • 2. Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

    • Options
    • A. Mercury in glass thermometer.
    • B. Alcohol in glass thermometer.
    • C. Fused metal (Na or K) in steel thermometer.
    • D. Nitrogen in steel thermometer.
      • Discuss
    • 3. Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop.

    • Options
    • A. Tank 1
    • B. Tank 2
    • C. Tank 3
    • D. Tank 4
      • Discuss
    • 4. Liquid flow rate in an open channel can not be measured by a/an

    • Options
    • A. orifice meter
    • B. cipolletti weir
    • C. rectangular weir
    • D. V-notch
      • Discuss
    • 5. Which of the following is not classified as a thermo electric pyrometer?

    • Options
    • A. Resistance thermometer.
    • B. Thermocouple.
    • C. Optical pyrometer (disappearing filament type)
    • D. Radiation pyrometer
      • Discuss
    • 6. Which of the following is not a variable area flow meter?

    • Options
    • A. Piston type meter
    • B. Rotameter
    • C. Magnetic flow meter
    • D. Orifice and tapered plug meter
      • Discuss
    • 7. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

    • Options
    • A. increases
    • B. decreases
    • C. remains constant
    • D. increases exponentially
      • Discuss
    • 8. The unit of 'time constant' of a system is the same as that of

    • Options
    • A. velocity
    • B. time
    • C. (time)-1
    • D. none of these
      • Discuss
    • 9. Pyrometry refers to the measurement of temperature

    • Options
    • A. with the mercurial thermometer upto 350°C.
    • B. directly.
    • C. which is of higher magnitude.
    • D. all (a), (b) & (c).
      • Discuss
    • 10. Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

    • Options
    • A. 12
    • B. 36
    • C. 54
    • D. 68
      • Discuss

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