Most commonly used material for insulator is:
- Mica
- Porcelain
- Glass
- All of these
Correct answer: 2. Porcelain
Explanation: All the materials mentioned in the options (Mica, Porcelain, and Glass) are commonly used as insulators in various electrical and electronic applications. However on a comparative scale, porcelain is most commonly used material for insulators.
Porcelain insulators are known for their excellent electrical insulating properties, mechanical strength, and durability. They are commonly used in electrical power distribution systems, transmission lines, and other high-voltage equipment. The choice of insulator material depends on the specific requirements of the application, and porcelain is favored in many situations due to its reliability and performance characteristics.