Tungsten, due to its high melting point and excellent electrical conductivity, is widely used in high-temperature applications. Which of the following properties of tungsten makes it particularly suitable for use in electrical components like filaments and electrodes in high-temperature environments?

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RRB JE CBT 2 (Electronics Engineering) ReExam Official Paper (Held On: 04 Jun, 2025)

Answer 1

The correct answer is: High melting point and resistance to thermal shock

Tungsten is used in filaments (like bulbs, lamps) and electrodes because:
- It has an extremely high melting point (~3422°C), so it can withstand very high temperatures without melting.
- It has good resistance to thermal shock, meaning it doesn’t crack or break when exposed to rapid temperature changes.
- While it does have high electrical conductivity and low thermal expansion, the most important properties for high-temperature electrical components are the ability to survive the heat and not break due to sudden temperature fluctuations.