Subelement D: Display & Control Systems - 10 Key Topics – 10 Exam Questions— Topic 30: Video Amplifiers and Sweep Circuits
Question 8-30D6
Element 8 (RADAR)The main purpose of the video amplifier is to provide:
Explanation
A video amplifier's main role in a display system, particularly one utilizing a Cathode Ray Tube (CRT), is to take the detected and processed composite video signal and boost its amplitude. This amplified signal is then applied to the cathode (or sometimes a control grid) of the CRT. By modulating the voltage on the cathode, the electron beam's intensity is controlled, which in turn varies the brightness of the pixels on the screen, forming the visible image.
Option B (Resolver signals) refers to position sensing, unrelated to video display. Option C (Antenna X and Y signals) relates to antenna direction or specialized antenna types, not video amplification for display. Option D (Provide the drive signal to the sweep amplifier) is incorrect because sweep amplifiers are driven by horizontal and vertical synchronization circuits, not the video signal itself. The video amplifier handles image content, while sweep amplifiers handle beam positioning.
Related Questions
8-30D4 How many deflection coils are driven by the sweep amplifier?8-30D5 The main purpose of the sweep generator is to provide:8-31D1 Timing circuits are used to provide what function?8-31D2 The circuit that develops timing signals is called the:8-31D3 Which of the following functions is not affected by the timing circuit?