Power Engineering. Соколова Е.В. - 30 стр.

       Mercury (vapour) 10.38
       3. The atom or molecule which has lost an electron, and therefore also a defi-
nite amount of negative electricity, has acquired a net positive charge. It is attracted
to the cathode, but on account of its greater mass the atom or molecule moves much
more slowly than an electron travelling toward the plate. It may, however, acquire
considerable kinetic energy before completing its journey, and the impact of large
numbers of such positively charged particles can have a destructive action on the
cathode surface, particularly if this is of the coated type. This action is referred to as
cathode bombardment; it may be quite important in such tubes as the mercury-vapour
rectifiers.

      10.6 Переведите словосочетания

          a) cathode bombardment, mercury-vapour rectifiers, ionization potential,
      a large number of collisions; this phenomenon takes place in the space; on ac-
count of its greater mass; this action is referred to as cathode bombardment; they are
likewise attracted to the plate.

      10.7 Ответьте на вопросы

       1. When may some electrons collide with molecules of the gas? 2. What proc-
ess is known as ionization? 3. What is a definite amount of energy required for? 4.
What has the atom or molecule which has lost an electron acquired? 5. What action is
referred to as cathode bombardment?

      10.8 Переведите предложения

       1. The envelope of the tube is completely evacuated. 2. This action is referred
to as cathode bombardment. 3. This subject will be dealt with in the next chapter. 4.
The reaction is followed by temperature rise. 5. When the molecules of even a good
insulator are acted upon by an electric field, there is a motion of electrons due to this
field. 6. When the microphone is not acted upon, the diaphragm remains stationary. 7.
Amplifiers are needed in long-distance telephony. 8. A convenient graphical con-
struction may be employed to find the output components for any operating condi-
tion.

      10.9 Определите, какой частью речи являются слова

       completely, destructive, rectifier, action, considerable, negative, positive, colli-
sion, necessary, ionization, stimulative, potential.

      10.10 Переведите диалог, используя следующие слова и словосочета-
ния

      title, to occur, completely evacuated, in this case, to collide, to result in, releas-
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