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  • Question

  • Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature


  • Options
  • A. emf produced is very low of the order of microvolt.
  • B. embrittlement of iron occurs.
  • C. rusting of iron takes place.
  • D. both (b) and (c).

  • Correct Answer
  • both (b) and (c). 

    • Process Control and Instrumentation problems

    Search Results

    • 1. A simple pitot tube measures the

    • Options
    • A. average velocity
    • B. maximum velocity
    • C. point velocity
    • D. static pressure
      • Discuss
    • 2. A pyrheliometer is an instrument used for measuring the

    • Options
    • A. bright sunshine period.
    • B. beam radiation.
    • C. diffuse radiation.
    • D. none of these.
      • Discuss
    • 3. __________ is the static characteristics of an instrument,

    • Options
    • A. Response
    • B. Tine lag
    • C. Drift
    • D. dynamic error
      • Discuss
    • 4. The open loop transfer function of a control system is . This represents

    • Options
    • A. a first order system.
    • B. dead time system.
    • C. a first order time lag.
    • D. a second order system.
      • Discuss
    • 5. Presence of a small amount of water in the organic systems can be determined by the __________ method.

    • Options
    • A. electrical conductivity
    • B. polarimetry
    • C. emission spectroscopy
    • D. dielectric constant end loss factor
      • Discuss
    • 6. Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

    • Options
    • A. venturimeter
    • B. orificemeter
    • C. magnetic flow meter
    • D. hot wire anemometer
      • Discuss
    • 7. The level of a liquid under pressure can be determined using

    • Options
    • A. bubbler system
    • B. differential pressure manometer
    • C. diaphragm box system
    • D. air-trap system
      • Discuss
    • 8. Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

    • Options
    • A. helium
    • B. nitrogen
    • C. hydrogen
    • D. none of these
      • Discuss
    • 9. The term analogous to voltage in a single tank system is the

    • Options
    • A. heat content of the system.
    • B. liquid volume in the tank.
    • C. flow rate.
    • D. level of liquid.
      • Discuss
    • 10. Which is the symbol for "pneumatic control valve"?

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss

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