Question
Download Solution PDFWhich of the following materials is most commonly used for the filaments in incandescent lamps?
This question was previously asked in
SSC JE Electrical 06 Jun 2024 Shift 2 Official Paper - 1
Answer (Detailed Solution Below)
Option 3 : Tungsten
Free Tests
View all Free tests >
RRB JE CBT I Full Test - 23
14.2 K Users
100 Questions
100 Marks
90 Mins
Detailed Solution
Download Solution PDF- The material most commonly used for filaments in incandescent lamps is tungsten.
- Tungsten is preferred because it has a very high melting point (around 3,422°C), which allows it to operate at the high temperatures necessary to emit visible light without melting.
- It also has good electrical conductivity and durability, making it ideal for long-lasting performance in incandescent bulbs.
Additional Information
Tungsten is preferred for filaments in incandescent lamps due to several key properties:
- High Melting Point: Tungsten has an extremely high melting point of around 3,422°C, which allows the filament to glow at high temperatures without melting, ensuring durability and efficiency in light production.
- High Electrical Resistance: Tungsten's electrical resistance allows it to convert electrical energy into heat and light efficiently when a current passes through it.
- Durability: Tungsten is a very strong and durable metal that can withstand repeated heating and cooling cycles, increasing the lifespan of the filament.
- Low Evaporation Rate: Even at high temperatures, tungsten has a low evaporation rate, reducing the thinning of the filament and prolonging its life.
Last updated on May 29, 2025
-> SSC JE Electrical 2025 Notification will be released on June 30 for the post of Junior Engineer Electrical/ Electrical & Mechanical.
-> Applicants can fill out the SSC JE application form 2025 for Electrical Engineering from June 30 to July 21.
-> SSC JE EE 2025 paper 1 exam will be conducted from October 27 to 31.
-> Candidates with a degree/diploma in engineering are eligible for this post.
-> The selection process includes Paper I and Paper II online exams, followed by document verification.
-> Prepare for the exam using SSC JE EE Previous Year Papers.