3. CRT means Common ray tube Cathode ray tube Common ray tube None
1. Cathode ray tube Explanation: A cathode-ray tube is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms, pictures, radar targets, or other phenomena. A CRT on a television set is commonly called a picture tube.
cathode ray tube
