Контрольное задание №2 Вариант 2

I. Перепишите следующее предложение: подчеркните временную форму и залог. Переведите предложение на русский язык. Обратить внимание на перевод пассивных конструкций.

a) 1) The material is a good insulator and so the current is not leaking away from the wire.

2) The scientist has already completed his research.

б) 1) He was given some details to complete the circuit.

2) The basic radar information is displayed in the normal way on a cathode-ray tube.

II. Перепишите следующие предложения: подчеркните причастие I и причастие II, установите функции каждого из них. Переведите предложения.

1. While making experiment the student put down all the necessary data.

2. Some of measures taken illustrate this need.

3. When combining chemically hydrogen and oxygen form water.

4. 4) The equipment needed for the experiment was carefully checked.

III. Перепишите предложения, определите в них сказуемое и укажите его время и залог. Письменно переведите предложения на русский язык.

1. The first atomic power station was built in our country in June 1954

2. Russian engineers have developed new mining machines.

3. The chemical industry is making much use of isotope instruments

4. The demand for uranium will grow from year to year

5. In recent years there has been active study of new methods of producing uranium.

IV. Перепишите следующие предложения и письменно переведите их на русский язык, обращая внимание на функции герундия.

1. At the continued heating of a solid body the movement of its molecules becomes still faster.

2. The lecturer insisted on our making some more experiments.

3. Measuring and controlling are important parts of industrial engineering.

4. Industrial engineering is broadening to assist management in optimizing the gains and minimizing the risks of an enterprise.

V. Перепишите следующие предложения и письменно переведите их на русский язык, обращая внимание на значение слов “one”, “it”, “that”.

1. The amount of electricity of any proton is exactly the same as that of an electron.

2. It was A.S. Popov who invented the radio in 1895.

3. Everyone knows that Tsiolkovsky was one of the greatest scientists of his time.

4. It is known that physical, economic and business systems have technical and human aspects.

VI. Перепишите и письменно переведите текст со словарём на русский язык.

NEGATIVE TRANSCONDUCTANCE OSCILLATOR

A negative transconductance oscillator consists of a pentode with the screen and suppressor grids coupled together. The screen is more positive than the plate. The cathode supplies electrons to both the screen and the plate. If the screen voltage rises, this increase is transferred over to the suppressor. It becomes more positive than before. A large quantity of electrons passes to the plate and a small quantity of electrons passes to the screen. Thus, the screen current is reduced. A negative resistance characteristic is produced in the screen circuit at the terminals.

A tuned circuit is connected to the terminals and in this way oscillations are produced.

TRANSMISSION LINES AND THEIR EFFICIENCY

Wires are used to deliver electric power and to interconnect different components of electrical installations. Conductors used for electric wiring are commonly produced of copper and aluminum. Aluminum is widely used nowadays due to its low cost. Copper is also widely used in electrical engineering but its cost is much higher.

Cross-sections of copper conductors used nowadays are from 0,5 up to 800 sq mm. Aluminum conductors have the same cross-sections but the minimum one is 2—5 sq mm.

Wires connecting the components of various installations may be insulated. They may also be used without insulation. Since in short lengths of wire power loss is exceedingly low one can ignore it. In long wires (longer than 10 m), power loss cannot be ignored since it is rather high. Power loss in a line should not exceed a certain value. If this value is exceeded, the line becomes inefficient. ~ 1340