In a black and white television set the picture tube has only one electron gun that produces the picture on its screen. What number of electron guns is there in a colour picture tube?

Options :
  1. five
  2. three
  3. four
  4. six
Answer and Explanation :-

Answer: Option 2


An electron gun (also called electron emitter) is an electrical component in some vacuum tubes that produces a narrow, collimated electron beam that has a precise kinetic energy. The largest use is in cathode ray tubes (CRTs), used in older television sets, computer displays, and oscilloscopes. They are also used in microwave linear beam vacuum tubes such as klystrons, inductive output tubes, travelling wave tubes, and gyrotrons, as well as in scientific instruments such as electron microscopes and particle accelerators. Black-and-white, often abbreviated B/W or B&W, is a term referring to a number of monochrome forms in visual arts. Television programming was first broadcast in black-and-white. Colour television is part of the history of television, the technology of television and practices associated with television's transmission of moving images in colour video that came later. A monochrome picture tube has one electron gun and a continuous phosphor coating that produces a picture in black and white. A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. For colour picture tube the screen is formed of three different phosphors and there are three electron beams, one for each colour phosphor. The three colours-red, green and blue produced by three phosphors combine to produce different colours.

How do you rate this queston?  Very Easy  Easy  Average  Above Average  Tough

Previous Question : A fuse or fuse wire that is used in domestic electrical appliances is made of a metal of

Next Question : Which of the following options best defines the commonly used term 'Black Box'?

Click here for online test on General Science


 (Getemail alerts when others member replies)

When she was a child, my love carried a road-map in her hand the way other girls carried handkerchiefs. She always knew the way. Her feet were little wings. And her beautiful head was a compass.
-Roman Payne