Контрольное задание №4 Вариант 5.

I. Перепишите следующие предложения. Найдите в них неличные формы глагола (инфинитив, причастие или герундий) Определите их функции в предложении. Письменно переведите предложения на русский язык.

1. After discussing the three main communication problem we’ll pass to a communication system.

2. There are some kinds of noises to be added to the transmitted signal.

3. The way of overcoming this drawback is not an easy one.

4.Consult the glossary given in this book.

II. Перепишите и письменно переведите на русский язык следующие предложения. Помните, что объектный и субъектный инфинитивные обороты соответствуют придаточным предложениям.

1. They consider noise to be unwanted.

2. Samples of semiconductors with improved properties are reported to be obtained on a new installation.

3. We know the information to be low when situation is highly organized and is not characterized by a large degree of randomness or of choice.

4. The receiver is known to decode the message.

III. Перепишите и письменно переведите на русский язык следующие предложения. Обратите внимание на перевод зависимого и независимого (самостоятельного) причастных оборотов.

1. The semiconductor material being used to fabricate component parts within a single piece of semiconductor, the latter becomes an entire circuit or a part of a circuit.

2. The effect is highly dependent upon frequency, with the lower frequencies showing less noise.

3. Designed for special purposes, integrated circuits have become the basis of microelectronics.

4. The construction or mounting (крепление) must be capable of withstanding the effects of wind and weather, including any possible structural changes throughout estimated operational life.

IV. Перепишите и письменно переведите на русский язык следующие предложения. Обратите внимание на перевод придаточных предложений условного наклонения.

1. Were distortion to some degree higher, the operators shouldn’t get the signal desired.

2. If you had used the new tape you would have got a better reproduction.

3. Had the customers used this tape they would have had better recording.

4. Were more amplification needed, the amplifiers could be connected in tandem.

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

MODERN RADIO RECEIVERS

Most modern radio receivers are of the superheterodyne type in which an oscillator generates a radio-frequency wave that is mixed with the incoming wave, thereby producing a radio-frequency wave of lower frequency; the latter is called intermediate frequency. To tune the receiver to different frequencies, the frequency of the oscillations is changed, but the intermediate frequency always remains the same (at 455 kHz for most AM receivers and at 10.7 MHz for most FM receivers). The oscillator is tuned by altering the capacity of the capacitor in its tank circuit; the antenna circuit is similarly tuned by a capacitor in its circuit. One or more stages of intermediate-frequency amplification are included in all receivers; in addition, one or more stages of radio-frequency amplification may be included. Auxiliary circuits such as automatic volume control (which operates by rectifying part of the output of one amplification circuit and feeding it back to the control element of the same circuit or of an earlier one) are usually included in the intermediate-frequency stage. The detector, often called the second detector, the mixer being called the first detector, is usually simply a diode acting as a rectifier, and produces an audio-frequency signal. FM waves are demodulated or detected by circuits known as discriminators or radio-detectors that translate the varying frequencies into varying.

In radio transmission a radiating antenna is used to convert a time-varying electric current into an electromagnetic wave or field, which freely propagates through a nonconducting medium such as air or space. In a broadcast radio channel, an omnidirectional antenna radiates a transmitted signal over a wide service area.

~ 1500