TThe expected answers were:
(a) (i) Electron gun - emits high velocity beam of electrons
(ij) X-plates - causes the horizontal deflection of the electron beam
(iii) Y-plates - causes the vertical deflection of the electron beam
(iv) Flourescent screen - emits visible lightwhen struck by the
electron beam
(b) - Television - Picture display
- Radar systems - Signal display
- Computer display - Waveform display (CRO)
The question was on Electron Emission and Thermionic Devices. It was quite
unpopular with the candidates. Quite a few candidates correctly responded to
this question.