Which of the following devices is used to measure relatively high temperatures, such as encountered in furnaces?

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NTPC CBT-I (Held On: 7 Jan 2021 Shift 2)
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  1. Barometer
  2. Pyrometer
  3. Ammeter
  4. Fluxmeter

Answer (Detailed Solution Below)

Option 2 : Pyrometer
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

Detailed Solution

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The correct answer is Pyrometer.

Key Points

  • Pyrometer 
    • The device for measuring relatively high temperatures, such as are encountered in furnaces. Hence, Option 2 is correct.
    • Most pyrometers work by measuring radiation from the body whose temperature is to be measured.
    • Radiation devices have the advantage of not having to touch the material being measured.
    • Radiation Pyrometers are used to measure the temperature of red hot metals up to 3000°C.
    • It is also known as an Infrared thermometer or Radiation thermometer or non-contact thermometer used to detect the temperature of an object’s surface temperature, which depends on the radiation (infrared or visible) emitted from the object.
    • It acts as a photodetector because of the property of absorbing energy and measuring EM wave intensity at any wavelength.
    • These are used to measure high-temperature furnaces.
    • These devices can measure the temperature very accurately, precisely, pure visually, and quickly.
    • Pyrometers are available in different spectral ranges ( since metals – short wave ranges and non-metals-long wave ranges).

Additional Information

An ammeter

 

  • It is a measuring instrument used to measure the current in a circuit. Electric currents are measured in Amperes, hence the name.
  • The ammeter is usually connected in series with the circuit in which the current is to be measured.

Barometer

  • It is used to measure local atmospheric pressure.
  • Fluid pressures can be measured regarding an arbitrary datum.
  • The common datum is
    • Absolute zero pressure
    • Local atmospheric pressure
Fluxmeter
  • The search coil magnetometer or induction magnetometer, based on an inductive sensor, is a magnetometer that measures the varying magnetic flux.
  • An inductive sensor connected to a conditioning electronic circuit constitutes a search coil magnetometer.

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