- •1. Learn the following active words and use them in the sentences of your own
- •3. Look through the text and write out the English equivalents of the following words and word combinations. Use them in the sentences of your own.
- •5. Give short answers to the following questions:
- •7. Translate the following sentences:
- •1. Learn the following active words and use them in the sentences of your own.
- •2. Translate the following chains of words. Define what parts of speech they are
- •3. Look through the text and find the English equivalents to the following words and word combinations; use tem in the sentences of your own.
- •4. Translate the following sentences paying attention to the participle:
- •1. Learn the following active words and expressions. Use them in the sentences of your own.
- •4. Answer the following questions:
- •5. Work in pairs. Put questions to your partner and he (she) will answer them.
- •8. Translate the following sentences paying attention to the words need and turn:
- •9. Put all possible questions to the following sentences:
- •10. Define the following words according to the model given below.
- •13. Describe Fig. 2.
- •Exercises
- •Learn the following active words and use them in the sentences of your own:
- •2. Translate the following sentences, paying attention to the gerund:
- •7. Translate the following sentences paying attention to the words in bold type:
- •8. Put 5 questions to the text beginning with what.
- •9. Speak on the story told by the early Scandinavians.
- •10. Make an outline of the text.
- •1. Learn the following active words and use them in the sentences of your own.
- •2. Look through the text and find the English equivalents of the following words and word combinations:
- •5. Find the gerund in the text, define its function.
- •8. Translate the following sentences paying attention to both, both...And:
- •9. Fill in the blanks with prepositions:
- •10. Translate into Russian:
- •11. Form five sentences combining suitable parts of the sentence given in Columns I and II:
- •12. Describe Franklin's kite experiment.
- •13. Give a short summary of the text.
- •Exercises
- •1. Learn the following active words and Expressions
- •Look through the text and find the English equivalents of the following words and word combinations:
- •8. Make up a story of Franklin's kite experiment using the following sentences and sentences of your own (our sentences are given in a disorderly way):
- •11. Use the following expressions in sentences of your own:
- •13. Speak on magnetism.
- •15. Describe Figs 3 and 4.
- •Exercises
- •8. (A) For the names of the countries given in Column I find the names of the nations given in Column II:
- •10. Speak on:
- •11. Make an outline of the text.
- •12. Retell the text.
- •Exercises
- •1. Learn the following active words and use them in the sentences of your own:
- •2. Define the functions of the participle and the gerund in the text.
- •4. Answer the following questions:
- •5. Fill in the blanks with suitable words and word combinations given below:
- •6. (A) For the verbs in Column I find suitable nouns in Column II.
- •7. (A) Translate the following word combinations:
- •10. The following statements are not true to the fact. Correct them:
- •11. Make an outline of the text.
- •12. Retell the text.
- •1. Learn the following active words and use them in the sentences of your own:
- •2. Translate the following word chains into Russian, define what part of speech the words are.
- •4 Translate into Russian:
- •8. Form 10 sentences using the following words:
- •10. Translate the following sentences paying special attention to the words in bold type:
- •11. Retell the text.
- •12. (A) Fill in the blanks with prepositions, if necessary; (b) retell the text:
- •1. Learn Active Words and Expressions
- •2. Look through the text and find the English equivalents to the following words and word combinations. Use them in your own situations.
- •The Infinitive
- •2. Translate the following sentences paying attention to the infinitive
- •3. Translate the following sentences paying special attention to the words in bold type:
- •4. Translate the following sentences paying special attention to the infinitive:
- •5. Fill in the blanks with the words one or for:
- •6. Write out from the text all the sentences where the infinitive is used, and define its function. .
- •1. Active Words and Expressions
- •3. According to the models given below form sentences combining suitable parts of the sentence given in Columns I, II, III, IV,
- •5. Work in pairs, ask your fellow-students questions:
- •6. Explain why:
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •1 Learn the following active words and expressions and use them in the sentences of your own.
- •3. (A) Find the non-finite forms of the verb in the text; (b) define their functions.
- •4. Translate the following words and define what parts of speech they are:
- •5. Write out the adjectives with the suffix -able from the text. Translate them.
- •7. Answer the following questions:
- •9. Translate the following word combinations and use them in sentences of your own:
- •Exercises
- •2. (A) Give headings to each paragraph of the text; (b) explain why you have given such headings.
- •3. Translate the following sentences:
- •4. Define the non-finite forms of the verb met in the text.
- •5. Put 10 questions to the text.
- •6. Translate the following sentences:
- •7. Speak on:
- •Exercises
Exercises
I. Translate the following word combinations and say what non-finite form of the verb is used as an attribute:
the burning coal, the burning process;
the freezing water, the freezing point;
the turning point, the turning motor;
the writing-table, the writing student;
the melting ice, the melting process.
II. Define the function of the word do in the following sentences:
1. Do you know the principal physical property distinguishing a gas from a liquid and a solid? 2. Solid bodies neither flow as do liquids, nor occupy all available space as gases do. 3. Many substances can and do at various times exist in more than one of the four possible states. 4. Liquids have a definite volume at a given temperature but they do not occupy all the available space and take the shape of the container. 5. They say that heated liquids expand more than solids do when heated.
III. Translate the following questions and answer them:
1. Знаете ли вы основной закон термодинамики? 2. Можно ли превратить жидкость в газ? 3. При каких условиях можно превратить твердое тело в жидкое? 4. Может ли твердое тело превратиться непосредственно в газ? 5. Когда вода начинает кипеть? 6. Что такое кипение? 7. Что означает термин "latent heat"? 8. Какой закон установил Бернулли? 9. Когда увеличивается скорость молекулярного движения? 10. Почему почти все тела расширяются при нагревании? 11. Какова точка замерзания воды?
IV. Arrange the words and expressions given in Columns I and II in pairs of synonyms:
I II
fluid change
make substance
in question for instance
matter quantity
convert under con- for exam- sideration
pie do
amount liquid
V. Speak on:
A solid state of matter.
A liquid state of matter.
A gaseous state of matter.
VI. Qualify the following nouns with suitable adjectives:
Adjectives: gradual, open, constant, rapid, solid, physical, basic, atmospheric, molecular, definite
Nouns: pressure, change, speed, container, property, law, body, motion, size, theory
VII. Put six questions to the text.
VIII. Form words with the following suffixes and use them in sen tences of your own:
-ion, -ing, -tion, -y, -ous, -ful, -ance, -less, -ive, -ment, -ly, -ize, -able
IX. Describe Fig. 17.
X. Translate the following text:
Nuclear Engineering Course
Experiments are carried out at times by the students attending the course of nuclear engineering at the university. They are of two types. The first consists of measurements at a low flux level, generally carried out when the burn-up of the fuel is such that an addition of new fuel elements, or a change of some, is required* The students take part in all the measure-
ments connected with the restarting of the reactor. At the same time, they make measurements of the flux distribution, power level and control rod calibration. This work is, however, hampered by the high background of gamma radiation.
The second type comprises experiments made during normal operation. These are mostly neutron and gamma flux measurements in water or in immersed shielded equipment.
LESSON TWENTY-THREE
NEW SOURCES OF ENERGY
According to the Program of the Communist Party of the Soviet Union, finding the best ways and means of utilizing the natural sources of power and discovering new power sources are among the most important tasks in the field of science.
The large quantities of electric power generated at present mostly depend on various sources of mechanical energy. It is obvious that production of so much power by existing means only could not last for ever since the earth's available supply of coal, wood and oil will be completely used up some day.
Apart from the main sources of energy, that is, fuel and water power which meet most of the present-day power requirements of mankind and also apart from atomic energy, there are several other sources as well.
It is with one of these so-called "new sources of energy" that we shall deal below.
Wind-Driven Power Plant. It is calculated that the annual energy available in the winds over the earth's surface exceeds millions of millions of kilowatt hours. Nevertheless, only a comparatively negligible part of that value finds an efficient application under cur present conditions.
It would be hard to say exactly when windmills were first harnessed as a source of mechanical energy. The Dutch, at least, are said to have used them for centuries in order to perform certain kinds of mechanical work. Old Egyptian writings tell us that wind power had already been used a thousand and more years before our times. However, wind power has been able to meet but small local needs for mechanical power.
Today scientists, designers, and inventors are turning their attention to another purpose, namely, that of electricity
generation. Generally speaking, electric windmills are in production or operation in a number of countries, the Soviet Union, the United States, England and France being among them. We should like to point out here that in 1931 a large turbine-powered by the wind was built for electricity generation in Yalta, the Crimea. The electric generator of that equipment was housed in an installation raised on a high tower.
Windmills may in theory obtain perhaps about 60 per cent of the wind power but in practice losses in the rotor and in the whole equipment as well as considerable electrical losses are supposed to reduce the efficiency to some 40 per cent or even less. The basic elements defining and influencing the obtainable energy are the velocity and strength of the wind.
So far nothing was said about the principal disadvantage distinguishing wind power from some of the other sources of energy. Sometimes there is no wind at all and even when it blows, its strength and direction may change at any moment. In short, we cannot expect the wind to blow when, where and as long as we should like it.
Whatever may be its exact form, purpose, or maintenance, a wind power plant must consist of the following main parts:
A rotor which is turned round by the wind. It goes without saying that a wind-driven rotor must obviously be designed in such a manner that the wind blowing upon it causes it to rotate.
A tower to raise the rotor well above the earth's surface so that it can circulate freely without any danger or damage to people. The tower should be as high as possible because then the rotor intercepts wind moving at a greater and steadier rate than that over the earth's surface.
The electric generator to be driven by the rotor and to produce power.
The three parts mentioned above form the wind-driven power plant.