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  • Question

  • Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.


  • Options
  • A. increase of pressure
  • B. increase of thermal conductivity
  • C. volumetric expansion
  • D. differential linear expansion

  • Correct Answer
  • volumetric expansion 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

    • Options
    • A. 63.2
    • B. 87.5
    • C. 95
    • D. 100
      • Discuss
    • 2. Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

    • Options
    • A. antimony
    • B. gold
    • C. silver
    • D. nickel
      • Discuss
    • 3. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

    • Options
    • A. making the volume of thermometer bulb as large as conveniently possible.
    • B. reducing the volume of the capillary to a minimum.
    • C. reducing the volume of the receiving element to a minimum.
    • D. all 'a', 'b' & 'c'.
      • Discuss
    • 4. When a bare thermocouple is covered by a protective sheath, the response becomes

    • Options
    • A. faster and oscillatory.
    • B. faster and non-oscillatory.
    • C. slower and oscillatory.
    • D. slower and non-oscillatory.
      • Discuss
    • 5. Stability of a control system containing a transportation lag can be best analysed by

    • Options
    • A. Routh test
    • B. root locus methods
    • C. frequency response methods
    • D. none of these
      • Discuss
    • 6. The open loop transfer function of a process is . In the root locus diagram, the poles will be at

    • Options
    • A. -1, -4
    • B. 1, 4
    • C. -2, -3
    • D. 2, 3
      • Discuss
    • 7. Composition of alloys can be determined by

    • Options
    • A. polarograph
    • B. chromatograph
    • C. refractrometer
    • D. none of these
      • Discuss
    • 8. A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

    • Options
    • A. helium
    • B. hydrogen
    • C. nitrogen
    • D. none of these
      • Discuss
    • 9. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

    • Options
    • A. -38.9
    • B. -11.9
    • C. -60.9
    • D. -80.9
      • Discuss
    • 10. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

    • Options
    • A. chromel-alumel
    • B. iron-constantan
    • C. platinum-rhodium
    • D. platinum-platinum+rhyodium
      • Discuss

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