Прочитайте текст и определите какой из заголовков соответствует тексту. The television receiver incl...: ответ на тест 857124 - Английский язык

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In the colour receiver the incoming signal goes through frequency and amplitude selective circuits. In these circuits the brightness components, the colour components, and the horizontal and vertical beam-synchronizing components are separated. The brightness component is applied simultaneously to each of the three electron guns. The red, green, and blue colour signal voltage components are produced and are applied to the three respective kinescope electron guns. They combine with the brightness components voltage to produce beam intensities which reproduce the original picture.

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The control grid was added between the cathode and plate of a diode and so it provided the resulting triode tube with the ability to amplify tiny signals. The control grid in this tube is a circular spiral of a number of turns of fine wire that completely surround the cathode. Because of its open construction the grid does not directly hinder the flow of electrons to the plate, but when a voltage is placed on the grid it has a profound effect on the electric field between cathode and plate and, hence, on the total electron flow.

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In the colour receiver the incoming signal goes through frequency and amplitude selective circuits. In these circuits the brightness components, the colour components, and the horizontal and vertical beam-synchronizing components are separated. The brightness component is applied simultaneously to each of the three electron guns. The red, green, and blue colour signal voltage components are produced and are applied to the three respective kinescope electron guns. They combine with the brightness components voltage to produce beam intensities which reproduce the original picture.

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Telephony is the branch of telecommunication which provides for the exchange of information in the form of speech. In any telephone system speech or other sounds are converted into electric signals that are transmitted to a distant point where they are converted back into reproductions of the original sound.
Telephone set is an assembly of apparatus provided at each end of a telephone circuits to enable the user to make and receive calls.
A microphone forming part of a telephone set is called a telephone transmitter while a transducer forming part of a telephone set and used to convert voice-frequency currents into audible sounds is telephone receiver. The system also includes an electric bell responsive to low-frequency AC or pulsating current and is used as a calling device at a telephone station.

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In overseas communications, telegraph messages are transmitted over high-frequency radio (3-30 MHz), transoceanic submarine cables, or satellite communication channels. But it should be noted that the number of messages carried on high-frequency radio is constantly decreasing.
Most radio circuits operate directly between different countries of the world. As to radio telegraph transmitters, they are usually either of the frequency-shift-keying type or the single-side-band type.

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A superconductive electric cable was made by the research workers at the Power-Engineering Institute. It is a very useful device and its main property is its being cryogenic. Compared with other types of cables, it has a great advantage – its use will result in transmitting current practically without losses, which is of great importance since nowadays percentage of losses in transmitting electric power over long distances is rather high; it is ten per cent and even more.
The properties of the new cable being unique, electric current up to 10,000 amp at 10,000 V and more can be transmitted over long distances. The superconductive cryogenic transmission lines are especially efficient for Russia: the power resources of the country are known to be concentrated mainly in the eastern parts of the country while three-quarters of the industrial potential are concentrated in the European part.