Question

Which of the following alloy is widely used in thermocouples?
1. Brass
2. Bronze
3. Duralium
4. Nichrome

Answer 1

Correct Answer - Option 4 : Nichrome

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.​