Question

In the original analog xerographic process what material was used as the drum coating?
1. Tungsten
2. Carbon
3. Selenium
4. Copper

Answer 1

Correct Answer - Option 3 : Selenium

The correct answer is Selenium.

• Xerography, also known as electrophotography, is a printing and photocopying technique that works on the basis of electrostatic charges.
• The xerography process is the dominant method of reproducing images and printing computer data and is used in photocopiers, laser printers, and fax machines. 
• The drums in the copiers originally developed by Xerox Corporation were manufactured with a surface coating of amorphous selenium applied by vacuum deposition.
• Selenium is used because it is able to hold and conduct charges in the absence and presence of light.