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  • Question

  • Which of the following is not a composition measuring instrument?


  • Options
  • A. Thermal conductivity cell
  • B. Mass spectrometer
  • C. Polarograph
  • D. Hot wire anemometer

  • Correct Answer
  • Hot wire anemometer 

    • Process Control and Instrumentation problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
      • Discuss
    • 4. Flame photometry is used for the determination of compositional analysis of

    • Options
    • A. solids
    • B. alkali metals
    • C. natural gas
    • D. isotopes
      • Discuss
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

    • Options
    • A. Platinum resistance thermometer
    • B. Mercury in glass thermometer
    • C. Vapor pressure thermometer
    • D. Radiation pyrometer
      • Discuss
    • 9. Dome temperature of blast furnace stove is most accurately measured by a

    • Options
    • A. radiation pyrometer.
    • B. platinum-platinum/rhodium ther-mocuple.
    • C. iron-constantan thermocouple.
    • D. platinum resistance thermometer.
      • Discuss
    • 10. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

    • Options
    • A. 250
    • B. 350
    • C. 550
    • D. 700
      • Discuss

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