UGC NET CSE | January 2017 | Part 3 | Question: 13

Question

Which of the following statement(s)  is/are correct?

• A. Persistence is the term used to describe the duration of phosphorescence.
• B. The control electrode is used to turn the electron beam on and off.
• C. The electron gun creates a source of electrons which are focused into a narrow beam directed at the face of CRT.
• D. All of the above

Answer 1

Option 4.

All are correct.

Persistence is the time to which the phosphors in the cathode Ray Tubes emit light until the next electrons is fired.

control electrode-an electrode to which a varying signal is applied to vary the output of a transistor or vacuum tube.

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.

Answer 2

#Persistence is the term used to describe the duration of phosphorescence.  (TRUE)

# The control electrode is used to turn the electron beam on and off (TRUE)

# The electron gun creates a source of electrons which are focussed into a narrow beam directed at the face of CRT. (TRUE)

Ans(4) All of the Above