Вопрос № 223064 - Английский язык

Прочитайте текст и определите, какой из заголовков соответствует тексту
A diode is a two-element electron tube that consists of a cathode and an anode or plate acting as an electron collector. By applying a positive voltage to the plate of a diode, an electric field is established between cathode and plate that attracts electrons emitted from the cathode to the plate.

Прочитайте текст и определите, какой из заголовков соответствует тексту
The simplest combination of elements constituting an electron tube is the diode. It consists of a cathode, which serves for emitting the electrons, and a plate or anode surrounding the cathode, which acts as a collector of electrons. Both electrodes are enclosed in a highly evacuated envelope of glass or metal. If the cathode is indirectly heated, there must be a heating spiral or a heater. The size of diode tubes varies from tiny metal tubes to large-sized rectifiers. The plate is generally a hollow metallic cylinder made of nickel, molybdenum graphite, tantalum or iron.

Прочитайте текст и определите, какой из заголовков соответствует тексту
The triode, or three electrode tube, is an elaboration of the diode.
The diode consists of two electrodes. They also appear in the triode and they constitute the basis of the triode. In the triode the third electrode (the control grid) is added in the space between the emmitter and the plate.
The control grid is a metal structure which may be of different shape, depending upon the design of the tube.
The basic function of the triode is to amplify the current, or voltage or electric power. In this process of amplification the control grid plays a most important role.

Прочитайте текст и определите, какой из заголовков соответствует тексту
A metal rectifier, a widely used form of rectifier, is the metallic type consisting essentially of a number of units formed by depositing a layer of semiconducting material, such as copperoxide on a metal conducting base. These units, generally in the form of washers, are assembled on rods under pressure, the number of units employed being determined by the voltage. Each unit has the peculiar property of passing current freely when the semi-conducting layer is positive and allowing practically no current to flow in the opposite direction. This form of rectifier has the great advantage of strength, absence of moving parts and relative simplicity.

Прочитайте текст и определите, какой из заголовков соответствует тексту
Another type of rectifier is represented by various kinds of two-electrode valves, or diodes. These consist of a glass tube or bulb containing an electron-emmiting member (the cathode) and an electrode (called the anode) which collects the emitted electrons and causes a flow of current so long as it is positive with respect to the cathode. The cathode heater is supplied with a suitable voltage from the transformer secondary to provide the heating necessary for the emission of electrons.

Прочитайте текст и определите, какой из заголовков соответствует тексту
Ultra-violet rays are familiar to most people as the particular art of sunlight that is "health-giving".
The effect of the ultra-violet rays is to produce in the skin the vitamin that is important for the promotion of bone-growth.
The use of these rays in diagnosis is a powerful weapon of medicine.
One of the most valuable uses of ultra-violet rays in industry is the testing of the quality of certain goods.