Which component in a TV is responsible for generating the high voltage sawtooth signals at a relatively high frequency?

This question was previously asked in
RRB ALP Mechanic Radio & TV 23 Jan 2019 Official Paper (Shift 3)
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  1. Fly back transformer
  2. UPS transformer
  3. SMPS transformer
  4. Isolation transformer

Answer (Detailed Solution Below)

Option 1 : Fly back transformer
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The correct option is 1

Concept:

In a traditional cathode-ray tube (CRT) television, the flyback transformer (also known as line output transformer - LOPT) is responsible for generating high-voltage sawtooth signals at a relatively high frequency.

A sawtooth wave is a kind of non-sinusoidal waveform and is so named because it ramps up linearly over time, and then sharply drops down, resembling the side profile of a saw's teeth. In CRT televisions, the high-frequency sawtooth signal generated by the flyback transformer controls the horizontal deflection of the electron beam. This scanning in the horizontal direction, coupled with the vertical scan, allows the movement of the electron beam across the entire screen, creating the image we see.

Here's some detail on the other components mentioned:

2) UPS Transformer: UPS stands for Uninterruptible Power Supply. This is not a component within a TV. It is an external device providing emergency power when the input power source fails. It doesn't generate high-voltage sawtooth signals.

3) SMPS Transformer: SMPS is short for Switched-Mode Power Supply. It is a power supply unit largely used for converting power efficiently in small quantities. In a TV, it is used for power regulation, not for generating high-frequency sawtooth signals.

4) Isolation Transformers: Isolation transformers serve the role of isolating different sections of electrical systems to prevent current flow; they only allow voltage flow. They do not generate high-voltage sawtooth signals. They are used for safety reasons, to separate the TV circuit from the line voltage.

So, in summary, it is the flyback transformer in television that generates the high voltage sawtooth signals at a relatively high frequency, which are vital for the scanning process in CRTs.

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