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3. Translate the following word-combinations and memorize them.

Radio frequency current, resonant circuit, carrier-wave, triode valve, flow in one direction, negative swing, electronic valve, crystal set, semiconductor diode, audio frequency current, tuned circuit.

4. Match the beginnings of the sentences (a) with their endings (b).

A

B

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

A radio receiver has to select…

The receiving aerial collects the modulated carrier wave and …

A radio receiver also has to …

The process of detection can be performed …

Valves can be used for amplification as well …

The tuning of the receiving aerial can be effected …

Rectification could be brought …

Demodulation has been achieved …

The crystal which would be used for rectification …

The shape traced the peaks of the emergent half of the carrier-waves…

a)

b)

c)

d)

e)

f)

g)

h)

i)

j)

separate the radio-frequency current from the radio-frequency carrier.

by altering the capacitance of the capacitor of the resonant circuit.

by the use of an electronic valves as a rectifier

feeds it into a circuit tuned to resonate at the frequency of the carrier-wave.

required radiation from all other EMWs.

about by the use of certain crystal.

are out of date today.

is the same as the original audio frequency current.

by using an electronic valve.

as permitting current to flow in one direction.

Translate these sentences into Ukrainian in the written form.

5. Choose the correct variant.

  1. A radio receiver has … main functions to perform..

a) one; b) three; c) none; d) two.

  1. The process of demodulation the radio-frequency current from the radio-frequency carrier is also called …

a) separation; b) addition; c) multiplication; d) detection.

  1. The tuning can be effected by alternating the capacitance of the … resonant circuit.

a) oscillator; b) capacitor; c) alternator; d) modulator.

  1. The operation of the demodulation the carrier wave can be performed by using …

a) a candle; b) an electronic valve; c) transistor; d) semiconductor.

  1. The second function of a receiver is to … the carrier wave.

a) rectify; b) modulate; c) demodulate; d) alternate.

6. Answer the following questions.

  1. How many functions does a receiver have? What are they?

  2. How is the selection carried out?

  3. Why is the frequency of a resonant circuit so important?

  4. What is the resonance?

  5. What is demodulation? How is it carried out?

  6. What do you know about rectification?

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