Вопрос № 223118 - Английский язык

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Now we shall discuss amplifier circuits, or more specifically, audio amplifiers. 1 _________ is an electron tube or transistor circuit, which 2_________________ up an ac signal applied to its input. It is called a voltage amplifier if the magnitude of the output  3  __________ . From the amplifier is considerably greater than that of the input voltage. As a matter of fact the ratio of the output voltage to the 4__________________ voltage is called the amplification or gain of the amplifier.

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When a number of 1_______________ are hooked up in series so that the output of one serves as the input to the next amplifier stage, the function of the early stages is usually to 2______________ up the voltage to a high 3_______________, while the last stage builds up the power to a level sufficient to operate an output device. Audio amplifiers amplify electrical ac signals that have a frequency range corresponding to the range of human hearing, or from about 20 to 15,000 cycles per 4________________.

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There are 1_______________ power amplifiers. These are similar to voltage amplifiers, except that their main 2__________________ is to supply a considerable amount of 3________________ i. e. voltage times current to the output or load 4________________, although the ac input signal may not draw any grid current and, hence, the input power may be zero.

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When a number of 1_______________ are hooked up in series so that the output of one serves as the input to the next amplifier stage, the function of the early stages is usually to 2______________ up the voltage to a high 3_______________, while the last stage builds up the power to a level sufficient to operate an output device. Audio amplifiers amplify electrical ac signals that have a frequency range corresponding to the range of human hearing, or from about 20 to 15,000 cycles per 4________________.

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The reflection of 1_______________ waves from aircraft had been observed in England in the early 1930s and the possibility for aircraft detection was discussed in 1934. It was soon realized that radio waves would be the 2________________ alternative to the existing inadequate acoustic warning equipment, which merely 3________________ for the sound of aircraft engines and had too short a range for proper warning of approach of last aircraft. In contrast, experiments indicated that radar could give a warning when the 4_________________ was 100 miles or more away.

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The principles of radar in a simplified form might be stated as 1________________:
1. electromagnetic radiation at high radio frequencies is 2________________ to detect and locate remote reflecting objects;
2. the radiation is sent out in pulses of a few microseconds’ duration, separated by intervals many times the duration of each pulse;
3. the pulses are returned from the reflecting objects and the returns are detected and displayed by receiving equipment placed at the point of transmission;
4. the distance to the 3________________ is determined by measurement of the time it took the pulses to reach the targets from the transmission equipment and return to it;
5. the directions of the targets are determined by use of highly directive radio 4__________________.