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Vocabulary

to generate- производить вырабатывать

to convert- преобразовывать, превращать

heat- теплота, тепло

heating- нагревание

to drive- приводить в движение

fuel- топливо, заправлять

to derive-происходить

steam- пар

combustion- сжигание

fission- распад

source- источник

to transmit- передавать

to count- считать

arailahility- наличие

consideration- вопрос

lead- свинец

furnance- печь

circuit-цепь

2. Выполните упражнения:

1) Распределите слова на 4 колонки:

Model: what? what king of? what to do? how?

use useful to use usefully

insulator, failure, fail, addition, additional, overestimate, equal, equalize, equality, equally, different, differ, difference, resist, resistance, resistivity, resistant, commonly, consumer, faulty, impossibility, carelessly, number, numerous, possible, clockwise

2) Поставьте всевозможные вопросы к предложениям, а так же дайте отрицательную форму:

1. Oxygen combines directly with nearly all elements.

2. Plastic materials are relatively new insulating materials.

3. Polythene cables have numerous advantages.

4. The importance of semiconductors for modern science cannot be underestimated.

5. Semiconductors conduct electricity less efficiently than metals.

6. The method proved to be efficient.

7. What resistance materials are in common use today?

3) Используя информацию текста, вставьте пропущенные слова:

а) The …. And energy balance is important for industry.

б) Conductirity increases with…

в) The amount of… used in the world in a year amounts to 12000 million tons of equivalent…

г)The wire and the… form a…

д) After the metal was heated it chamsed its colour to a red…

е) The heat is used to …. generate steam.

ж) Steam… a turbine generator

4) Составьте 7-8 вопросов по содержанию текста.

5) Перескажите текст.

3. Control text

Переведите текст и расположите абзацы в правильном логичном порядке

Testing Motors and Generators

It is of great importance, therefore, to make regular tests of insulation resistance of all machinery so as to detect possible faults. Different conditions may influence the value of the insulation resistance.

It is advisable, therefore, to make the test of the machine as soon after it has been shut down as possible, when the insulation resistance is likely to be lowest. If, after the motor has just been shut down the insulation resistance is found to be satisfactory, it may be assumed that it will be better at any other time provided that the machine does not stand idle for long in a humid atmosphere.

Faults on electrical machinery must be due to one pf two causes. One is the absence of continuity in the conductor which is supposed to be carrying the current. The other is the absence, or partial absence, of insulation. The latter is by far the more common and the more dangerous of the two. A burnt out armature, for example, is usually due to insulation failure.

A drop in insulation resistance may often be accounted for, for example, by damp weather.

As regards the effect of temperature it should be noted that the insulation resistance of motors and generators is generally lower when they are hot than when they are cold as the insulating varnishes used in the building of the machines have a lower resistance when hot than when cold.

Unit V

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