Question

The source of emission of electrons in a circuit is ______________

(a) p-n junction diode

(b) a barium and strontium oxide coated cathode

(c) accelerating anode

(d) post-accelerating anode

This question was addressed to me during an interview.

My query is from Advanced Problems on CRT and CRO topic in division Oscilloscopes of Electrical Measurements

Answer 1

Correct choice is (d) post-accelerating anode

The best I can explain: The source of focused and the accelerated electron beam is the electron gun. The electron gun which emits electrons forms them into a beam consisting of a heater, a cathode, a grid, a pre-accelerating anode, a focusing anode and an accelerating anode.