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Вопрос № 933225 - Английский язык

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A rectifier is a device which allows an electric power to pass in one direction but not in the opposite direction. 1________. Four of the most common are described below:
Selenium rectifiers are made of an aluminium plate with a selenium coating. 2_______. Instrument rectifiers are normally of the cooper oxide type, which consists of a copper disc with a cuprous oxide coating. 3_______. They are suitable for all power rectification, but are particularly useful for the low to medium power range. Thermionic diodes are found in radio circuits. 4_______.
Варианты ответов
  • They are used for high power rectification
  • There are various types of rectifier
  • They consist of two electrodes in a vacuum
  • Semi-conductor diodes are made with germanium or silicon
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Вопрос задал(а): Анонимный пользователь, 13 Ноябрь 2020 в 16:22
На вопрос ответил(а): Анастасия Степанова, 13 Ноябрь 2020 в 16:22

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Вопрос № 911681

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The value of money is reflected by its purchasing power – the rate at which money is exchanged for goods and services. 1_______. The purchasing power of each dollar can be compared over time by accounting for changes in the price level. 2_______. 3_______. The value of a 1986 dollar is therefore 100/328, or about 0.30 measured in 1967 dollars. 4_______.
The higher the price level is, the fewer goods and services can be purchased with each dollar, so the less each dollar is worth
To measure the purchasing power of the dollar in a particular year, first compute the price index for that year, then divide 100 by that price index
For example, the consumer price index for 1986 was 328, using 1967 as the base year
Thus, a 1986 dollar buys less than one-third the goods and services purchased by a dollar in 1967

Вопрос № 782203

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There are many different types of lasers. 1_______. The first type of laser was called a ruby laser.2_______. Other lasing mediums can be selected based on the desired emission wavelength, power needed and pulse duration. 3_______. The reason that CO2 laser is so dangerous is because it emits laser light in the infrared and microwave region of the spectrum. 4_______.
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Вопрос № 933226

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The open hearth and semi-muffle furnace are cheap to buy, and very easy to operate. 1_______. However, unlike the muffle furnace, it is difficult to heat the furnace evenly throughout the chamber and also to control the build-up of gases from the burner as they have no flue outlet. 2_______. In the open hearth furnace, it is also difficult to control the temperature in the chamber.
3_______. It is cheap, simple to operate, economical, and it also has good temperature control. However, it does not heat evenly or have good atmosphere control.
The muffle furnace is the most efficient of these three furnaces. 4_______. However, it is not cheap, simple to operate, or economical.
They do not use much fuel and therefore are more economical to run
This negative feature appears under ‘Atmosphere control’
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It heats evenly, and has good temperature and atmosphere control

Вопрос № 933227

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Sheet metal forming is widely used when parts of certain shape and size are needed. 1_______. One characteristic of sheet metal forming is that the thickness of the sheet changes little in processing. The metal is stretched just beyond its yield point (2 to 4 percent strain) in order to retain the new shape. 2_______. Shearing is a cutting operation similar to that used for cloth.
3_______. For example, to make the roof of an automobile from a flat sheet, the edges are gripped and the piece pulled in tension over a lower die. 4_______. And finally the edges are sheared off to give the final dimensions.
It includes forging, bending and shearing
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Вопрос № 933228

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1_______. This system was first developed in India in the 3rd century BC. 2_______.
The important innovation in the Arabic system was the use of positional notation, in which individual number symbols assume different values according to their position in the written numeral. 3_______. The symbol 0 makes it possible to differentiate between 11, 101, and 1,001 without the use of additional symbols, and all numbers can be expressed in terms of ten symbols, the numerals from 1 to 9 plus 0. 4_______.
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Positional notation also greatly simplifies all forms of written numerical calculation

Вопрос № 933229

Прочитайте текст.
The inclusion of other elements affects the properties of the steel. Manganese gives extra strength and toughness. Steel containing 4 per cent silicon is used for transformer cores or electromagnets because it has large grains acting like small magnets. The addition of chromium gives extra strength and corrosion resistance, so we can get rust-proof steels. Heating in the presence of carbon or nitrogen-rich materials is used to form a hard surface on steel (case-hardening). High-speed steels, which are extremely important in machine-tools, contain chromium and tungsten plus smaller amounts of vanadium, molybdenum and other metals.
Закончите предложение:
Steel containing 4 per cent silicon …
gives extra strength and corrosion resistance
are extremely important in machine-tools
is used to form a hard surface on steel
is used for transformer cores or electromagnets
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