III. After-text exercises:

1. Agree or disagree with the next statements:

1) The incoming signal from the antenna, consisting of a radio-frequency carrier oscillation modulated by an audio-frequency or video-frequency signal containing the impulses, is generally very strong.

2) Most radio receivers can operate quite well with an input from the antenna of a few millionths of a volt.

3) To tune the receiver to different frequencies, the frequency of the oscillations is not changed.

4) The detector is usually simply a diode acting as a rectifier, and produces an audio-frequency signal.

5) The most sensitive receivers have many stages of tuned radio-frequency amplification.

2. Find the information about:

1) the incoming signal from the antenna;

2) the type of the most modern radio receivers;

3) the tuning of the oscillator and the antenna circuit;

4) a high-fidelity receiver;

5) usual selectivity and excessive selectivity.

3. Put questions to each other.

4. Summarize the general ideas of the text. Use the following plan:

1) The essential components of a radio receiver.

2) The dominant consideration in receiver design.

3) The most modern type of a radio receiver.

4) A high-fidelity receiver.

5) Principal characteristics of a good radio receiver.

5. Turn the following sentences from direct into reported speech:

l) He was asked, "What conductors are called line conductors?"

2) He reported, "It will be possible for vacuum tubes to convert part of their output energy into visible light".

3) "Has one form of energy been transformed into another?" He asked.

4) The engineer asked, "Have you ever seen a jet engine in action?"

5) He asked, "What special steps are taking to reduce the weight of the mechanical part?"

6) He says "Charles Babbage produced the first general purpose digital computer".

7) He asked me, "How are the physical components of this system called?"

8) He said, "These three components interact with each other to perform a given task".

9) He said, "A new device for measuring pressure is being designed now".

10) He says, "Transistors require much more electrical power to operate".

11)The professor said to the students, "The next lecture will be on linear motion".

12) My scientific adviser said to me, "You'll go to London to take part in the conference".

13) In 1905 Albert Einstein declared, "Mater can be converted into energy".

14) He said, "The engineer of our laboratory was offered new research work".

15) The English teacher said to the students, "Don't look up the words in a dictionary when you translate such an easy text".

Unit Three

Lesson One

I. Pre-text Exercises.

1. Practice reading the following words:

Cybernetics [saibə:ˈnetiks], utilization [ju:tilai'zeiʃn], launch [lɔ:ntʃ], trajectory ['trædʒiktəri], reliable [ri'laiəbl], advance [əd'va:ns], advantage [ad'va:ntidʒ], realm [relm], vehicle ['vi:ikl].

2. State to what part of speech the following words belong:

discovery, investigation, physical, rapidly, receiver, communication, shaping, computer, sensitivity, optical.

3. Form verbs adding the suffix —en to the given adjectives, translate them:

Example: fast — твердий;

to fasten — затвердівати.

Bright, dark, sharp, wide, less, broad, deep, short, weak, hard.

4. Match up the words which have an opposite meaning:

a) to cover, directly, old, much, more, rapidly, small, visible, powerful, long, before, to take, significant, effective;

b) to uncover, ineffective, to give, after, powerless, short, large, invisible, slowly, less, little, new, indirectly, insignificant.

5. Give the initial forms of the following words:

followed, developed, electrons, communication, expanding, receiver, combined, enabled, leading, senses.