Power Engineering. Соколова Е.В. - 27 стр.

which the cathode is able to emit at this temperature are reaching the plate and conse-
quently the current is at its maximum possible value. The only effect of further in-
crease of plate voltage is to cause each electron to arrive at the plate with higher ve-
locity, but as this does not increase the number of electrons per second, the plate cur-
rent is not changed. If, however, the cathode temperature is raised, as in the second
curve, more electrons are given off, and the maximum plate current is increased.

      9.6 Переведите словосочетания

       a) plate circuit, cathode temperature, plate potential, temperature saturation,
maximum plate current, due to the heating.
       b) The current is held constant; it is due to the fact that; according to the num-
ber of active elements

      9.7 Ответьте на вопросы

       1. How are thermionic tubes classified? 2. What does the magnitude of the cur-
rent depend upon? 3. What is known as temperature saturation? 4. What is the only
effect of further increase of plate voltage?

      9.8 Переведите предложения

       1. Thermionic tubes are known to be classified according to the number of ac-
tive elements. 2. In order to investigate these relations the circuit of Fig. 1 should be
used. 3. The proton is about 1,840 times more massive then the electron. Atoms are
believed to be built up of protons, neutrons and electrons. 4. The action to be referred
to is known as cathode bombardment. 5. If we double the force pushing the electrons
around a circuit, we expect them to move twice as fast.6. The only way to stop or
control the anode current is to decrease or remove the anode voltage.7. Emitters to be
made of this metal will be used in large transmitting tubes.8. Copper is claimed to
have a relatively large conductivity.9. To measure current we use an ammeter con-
nected in series with the resistance. 10. The velocity of atoms and molecules when
moving within the confines of the material they comprise is found to be dependent
upon the temperature. 11. The article was provided with diagrams for the students to
understand it better. 12. To move electrons from the cathode to the plate requires in
the first place the heating of the cathode. 13. These fluctuations appear to have re-
sulted in the development of hum in the tube output.

     9.9 Прочтите диалог в ролях . Найдите информацию по теме “Моя
специальность”

      Dialogue

      A. One of my difficulties in studying English is to speak on our specialty.
      B. That certainly is a difficult point. Especially when one doesn't know the spe-
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