Which one of the following sensors produces a voltage output upon sensing temperature?

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 2
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  1. RTD
  2. Thermocouple
  3. Strain gauge 
  4. Thermostat

Answer (Detailed Solution Below)

Option 2 : Thermocouple
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Detailed Solution

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Thermocouple:

  • The thermocouple is an electrical device containing junctions of two dissimilar metal joints. It is used as temperature sensors.
  • It works on the principle of the thermoelectric effect or the Seebeck effect which means which states that the temperature difference between two dissimilar electric conductors produces a voltage difference between them.
  • This potential difference is used to measure temperatures.

26 June 1

  • Thermocouple types of instruments can be used for dc and ac applications. 
  • They can be used for measurements of currents and voltages at high frequencies. 
  • These instruments are very accurate well above a frequency of 50 MHz.
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