Контрольная по английскому Cathode-Ray-Tube

 

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Cathode-Ray-Tube

 

КОНТРОЛЬНАЯ РАБОТА
I. Прочитайте, а затем письменно переведите 1,2 абзацы текста. Английский текст перепишите на левой странице тетради, русский перевод - на правой:
CATHODE - RAY - TUBE

1. Cathode-ray-tubes provide a visual representation of voltage and current wave forms. Cathode-ray tubes consist of three basic components: 1) the electron gun, 2) a deflection system, 3) a fluorescent screen. These essential parts of a cathode-ray tube are mounted inside a highly evacuated, funnel-shaped glass envelope. The large end of it has the fluorescent screen coated upon the inside surface.

2. The electron gun has the Job of producing and focusing the electrons into a narrow beam. An electron gun of the electrostatic type consists of an indirectly heated cathode, a control grid, an accelerating electrode, a focusing anode, and a final accelerating anode. These electrodes are in the form of cylinders surrounding the cathode.

3. The cathode emits the electrons. The control grid deter¬mines the amount of electron flow by means of the negative bias placed on it. The accelerating electrode being highly positive speeds up the electrons passing through it. Electrons passing through the openings in the accelerating elect¬rode are focused into a sharp electron beam.

II. Найдите и тексте ответы на следующие вопросы:
1. What is the function of the cathode?
2. What does the control-grid determine?

III. Найдите в тексте производные от следующих слов. Выпишите их, переведите на русский язык, укажи¬те часть речи;
1) direct 2) to accelerate 3) high 4) to vary 5) to deflect 6) essence 7) to open 8) basis 9) to represent

IV. Перепишите и переведите на русский язык следующие словосочетания. Обратите внимание на левое существительное, которое переводится определением:
1) an a.c. signal voltage 2) a resistance load 3) an input signal 4) a low-currant high-voltage discharge 5) voltage gain 6) current gain factor 7) anode load 8) grid-cathode resistance 9) amplification factor 10) electrode impedance

V. Перепишите и переведите на русский язык следующие предложения. Подчеркните инфинитив и определите его функцию;
1. The lines of force to be produced by current in one part of the circular coil are added to the lines produced in another part of the coil.

2. To produce a larger amount of direct current two diode tubes may be combined into one circuit.

3. Some types of vacuum tubes may be used to rectify an alternating current.

VI. Перепишите и переведите на русский язык следующие предложения. Подчеркните причастия I, II определите их функции:
1. Electromagnetic waves used in radio and television transmission have longer wave lengths.
2. The rectifiers are protected against flash over by quick acting circuit breakers.
3. The described circuit may be built up by using vacuum tubes.

VII. Перепишите и переведите следующие предложения на русский язык. Подчеркните герундий:
1. In the future a television system will be used for choosing landing sites.
2. The electrons pass through the grid without hitting its wires.
3. The process of converting a modulated radio frequency is called deflection.

VIII. Перепишите следующие предложения, переведите их на русский язык, определите функцию слова "require":
1. The solution of the problem required concentrated efforts of many scientists.
2. The data required were analysed in our laboratory.
3. When required these data will be applied in our practical work.

IX. Переведите следующие предложения с конструкцией it is (was) ... that (who, which):
1. It was Alexander Popov who demonstrated his "storm indicator" which was the prototype of modern radio receivers.
2. It is radio-electronics that makes it possible to perform the most precise measurements and to test various equipment.
3. It was Kurchatov who laid the foundation of the atomic might of the land of Soviets.

КОНТРОЛЬНАЯ РАБОТА
I. Прочитайте, а затем письменно переведите на русский язык I и 2 абзацы. Английский текст перепишите на левой странице тетради, русский перевод - на правой;


AUDIO COMPONENTS AND CIRCUITS

1. The audio section of an a-m transmitter converts sound waves into audio voltages and currents. It usually consists of a microphone and a series of electron tube a-f amplifiers to raise the output of the microphone to a power level sufficient to modulate the transmitter by the chosen method.

2. There is little fundamental difference between the audio circuits used in modulators and those used in radio receiver. In radio receivers the power output may range from 1 watt for a small portable radio to several hundred watts for systems designed to cover a large area. A modulator may develop a power output ranging from 1watt to several thousand watts, depending on its driving power.

3. Another most important consideration is the bar' width of the channel used in communications. This bandwidth is directly proportional to the audio frequencies to be transmitted. The voice frequencies transmitted being limited to those in the usable speech range, the channel width to reduced, and more stations can be operated in a given band of frequencies without causing mutual interference.
4. Furthermore, fr-s outside the useful speech range absorb some of the sideband power which could be used to add more strength to the useful voice fr-s. For these reasons the speech amplifiers of communication transmitters often include design features which accentuate these speech fr-s.

II. Найдите и тексте ответы на следующие вопросы:
1. What do fr-s outside the useful speech range absorb?
2. What do the speech amplifiers of communication transmitters often include?

III. Выпишите из текста английские соответствия следующих сочетаний слов:
1) usual 2) to differ 3) to modulate 4) to consider 5) proportion 6) to use 7) to interfere 8) strong 9) to receive 10) to modulate

IV. Перепишите и переведите на русский язык следующие предложения. Обратите внимание на глагол should должен, следует и would в сослагательном наклонении - глагол + частица " бы":
1. Without the force of gravity there would be no pressure in liquids.
2. These receivers should possess the features of rapid frequency changing.
3. The analyzers should indicate radar data such as pulse width and pulse duration.

V. Перепишите и переведите на русский язык следующие предложения. Обратите внимание на конструкцию "сложное подлежащее" / см. I модель/: 1. Masers are sure to have a promising future as they will bе applied in numerous fields.
2. Radar is believed to be used to locate aircraft.
3. Thermionic tubes are known to be classified according to the number of active elements.

VI. Перепишите и переведите на русский язык следующие предложения. Обратите внимание на конструкцию "самостоятельный причастный оборот" / см. 2 модель/:
1. The voltage being increased, the field becomes strong enough to cause the electrons to produce additional ions by collision.
2. There are a number of different types of tubes in common use, the difference between them being in the design and amount of electrodes.
3. Very small transformers are cooled naturally by the atmosphere, no special cooling arrangements being necessary.

VII. Перепишите и переведите на русский язык следующие бессоюзные предложения. Обозначьте место опущенных союзов:
1. The material the apparatus is made of is a good non-conductor of heat.
2. That portion of mechanics we deal with is known as statics.