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  • Question

  • Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?


  • Options
  • A. Optical pyrometer
  • B. Radiation pyrometer
  • C. Photoelectric pyrometer
  • D. Thermocouples

  • Correct Answer
  • Thermocouples 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Flame photometry is used for the determination of compositional analysis of

    • Options
    • A. solids
    • B. alkali metals
    • C. natural gas
    • D. isotopes
      • Discuss
    • 2. Conversion formula for converting amplitude ratio (AR) into decibels is

    • Options
    • A. Decibel = 20 log10 (AR)
    • B. Decibel = 20 loge (AR)
    • C. Decibel = 20 log10 (AR)0.5
    • D. Decibel = 20 loge (AR)0.5
      • Discuss
    • 3. If response of a control system is to be free of offset and oscillation, the most suitable controller is

    • Options
    • A. proportional controller.
    • B. proportional-derivative(PD)controller.
    • C. proportional-integral (PI) controller.
    • D. proportional integral-derivative (PID) controller.
      • Discuss
    • 4. A system with transfer function is of __________ order.

    • Options
    • A. zero
    • B. 1st
    • C. 2nd
    • D. 3rd
      • Discuss
    • 5. The thermal emf-temperature relationship of most thermocouples is

    • Options
    • A. linear
    • B. parabolic
    • C. exponential
    • D. square root
      • Discuss
    • 6. Gain margin is equal to the

    • Options
    • A. amplitude ratio
    • B. reciprocal of amplitude ratio
    • C. gain in P controller
    • D. gain in P-I controller
      • Discuss
    • 7. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

    • Options
    • A. - 273° & 80°
    • B. 0° & 80°
    • C. 32° & 460°
    • D. 32° & 80°
      • Discuss
    • 8. Which of the following is not a composition measuring instrument?

    • Options
    • A. Thermal conductivity cell
    • B. Mass spectrometer
    • C. Polarograph
    • D. Hot wire anemometer
      • Discuss
    • 9. A control system has the following transfer function

      The initial value of the corresponding time function is

    • Options
    • A. 1
    • B. 1/8
    • C. 7/8
    • D. -1
      • Discuss
    • 10. Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

    • Options
    • A. - 39 and 350
    • B. - 51 and 439
    • C. - 79 and 395
    • D. - 10 and 425
      • Discuss

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