Power Engineering. Соколова Е.В. - 37 стр.

sistance), is much larger than for the triode. For the same reason, the amplification
factor is greater for a tetrode than for a triode. The mutual conductance Gm, however,
is of about the same magnitude as for a triode, although it is somewhat reduced by
reason of the fact that a portion of the emission current is diverted to the screen.
       5. For receiving-type tetrodes, rp is of the order of a megohm, and has a magni-
tude of several hundreds.

      13.5 Переведите словосочетания

      a) potential difference; A.C. input and output voltages; condenser action; load
conditions; screen-grid tube; the value of the internal plate resistance; receiving-type
tetrodes.
      b) for the same reason, as a consequence, in terms of tube characteristics, in
terms of this fact, on account of the electrostatic capacitance, by reason of this phe-
nomenon.

      13.6 Ответьте на вопросы

       1. Why is the A.C. potential difference between the grid and plate consider-
able? 2. Why does this potential difference produce a current flow from the output
circuit to the grid? 3. How may the instability be avoided? 4. At what potential must
the screen be operated to permit the flow of reasonable amounts of electron current?
5. What fact implies also that the cathode is shielded from the plate? 6. How is elec-
tron emission affected by the plate potential? 7. On account of what potential does a
portion of the electron stream pass to the screen? 8. Why is the value of the internal
plate resistance much larger than for the triode?

      13.7 Переведите следующие слова, обращая внимание на префикс un-

      unstable, unequal, unsteady, unusual, unaffected, unshielded.

      13.8 Расшифруйте сокращения

       d.c., a.c., т.е., c.p.s., p.h., r.f, k.c., u.h.f

      13.9 Прочтите диалог в ролях

      Dialogue

       A. I hear you have entered the Radio Engineering faculty.
       B. Yes, I want to be a radio engineer, like you.
       A. Glad to hear that. Really, it's a very interesting speciality. I suppose you are
interested intechnical journals on your future specialty, aren't you?
       B. Yes, I am fond of radio engineering, and I've read a great many articles con-
cerning this subject but sometimes I come across many things I don't understand.
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