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  • Question
  • 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

  • Correct Answer
  • Radiation pyrometer 


  • Process Control and Instrumentation problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. A manometer measures the __________ pressure.

    • Options
    • A. atmospheric
    • B. absolute
    • C. gauge
    • D. none of these
    • Discuss
    • 9. Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

    • Options
    • A. chromel-alumel
    • B. iron-constantan
    • C. platinum-platinum+rhodium
    • D. none of these.
    • Discuss
    • 10. Continuous measurement of specific gravity of a liquid is done by

    • Options
    • A. hydrometer
    • B. contact-type electric indicators
    • C. displacement meter
    • D. both (a) and (c)
    • Discuss


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