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  • Question
  • Which thermocouple can be used to measure a temperature of around 1400°C?


  • Options
  • A. Copper-constantan
  • B. Aluminium-chromel
  • C. Platinum-platinum+rhodium
  • D. None of these

  • Correct Answer
  • Platinum-platinum+rhodium 


  • Process Control and Instrumentation problems


    Search Results


    • 1. Dead zone is the

    • Options
    • A. same as time constant.
    • B. same as transportation lag.
    • C. maximum change in the variable that does not change the reading of the instrument.
    • D. none of these.
    • Discuss
    • 2. Flow rate of a river is measured by a/an

    • Options
    • A. pitot tube
    • B. vane meter
    • C. kennison nozzle
    • D. open weir
    • Discuss
    • 3. The transfer function for a P-D controller is

    • Options
    • A. Kc(1+?D s)
    • B. Kc(1 +1/?D s)
    • C. Kc ?D s
    • D. Kc/?D s
    • Discuss
    • 4. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

    • Options
    • A. speed of response
    • B. reproducibility
    • C. fidielity
    • D. static characteristics
    • Discuss
    • 5. Which of the following can not measure a temperature of 1600°C?

    • Options
    • A. Platinum resistance thermometer
    • B. Thermocouple
    • C. Photo-electric pyrometer
    • D. Radiation pyrometer
    • Discuss
    • 6. Which of the following thermocouples can measure the maximum temperature?

    • Options
    • A. Platinum-rhodium
    • B. Tungsten-molybdenum
    • C. Chromel-alumel
    • D. Iron-constantan
    • Discuss
    • 7. Gas chromatography is used for the measurement of

    • Options
    • A. temperature
    • B. pressure
    • C. concentration
    • D. flow rate
    • Discuss
    • 8. Thermistors are made of

    • Options
    • A. ultra pure metals
    • B. metal oxides
    • C. iron-copper alloys
    • D. nickel-chromium alloys
    • Discuss
    • 9. In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit

    • Options
    • A. overdamped response.
    • B. underdamped response.
    • C. undamped response.
    • D. unstable response.
    • Discuss
    • 10. Bode diagram is a plot of

    • Options
    • A. log (AR) vs. log (f) and (?) vs. log (f).
    • B. log (AR) vs. f and log ? vs.f.
    • C. AR vs. log (f) and ? vs. log (f).
    • D. none of these.
    • Discuss


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