Which of the following alloy is widely used in thermocouples?

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ISRO MCF Technical Assistant Mechanical 23 June 2019 Official Paper
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  1. Brass
  2. Duralium
  3. Bronze
  4. Nichrome

Answer (Detailed Solution Below)

Option 4 : Nichrome
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Detailed Solution

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Explanation:

Thermocouple:

  • The thermocouple is a sensor used to measure temperature.
  • It consists of two dissimilar electrical conductors forming a junction. 
  • Nichrome contains 80% Ni and 20% Cr. It is used mostly in thermocouples and in strain gauges.
  • A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect and this voltage can be interpreted to measure temperature.
  • Thermocouples are typically selected because of their low cost, high-temperature limits, wide temperature ranges, and durable nature.
  • Thermocouple gives the fastest response in less time.
  • Thermocouples are less accurate than RTDs in the low-temperature range. 
  • When compared with RTDs the durability of the Thermocouple is more.
  • The typical range of temperature of the thermocouple is -1800C to 23200C.

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