Question

What is the role of CRT?

(a) to emit electrons

(b) to emit protons

(c) to emit neutrons

(d) to emit alpha particles

The question was asked during a job interview.

This interesting question is from Simple Oscilloscope in portion Oscilloscopes of Electrical Measurements

Answer 1

The correct option is (a) to emit electrons

The explanation: Cathode ray tube forms the heart of a C.R.O. It is used to emit electrons so as to strike the phosphor screen to produce a spot for the visual display of the signals.