8
Figure 1C.
Basic tetrode circuit.
1-60. What is the function of Csg in figure 1C
above?
1. It serves as a feedback capacitor
2. It bypasses ac signals from the
screen grid to ground
3. It keeps dc voltages from being
applied to the screen grid from
ground
4. It couples ac signals from the
cathode to the screen grid
1-61. Which of the following undesirable
characteristics is/are associated with
tetrode operation?
1. The plate is isolated from the
electron stream
2. The plate emits secondary emission
electrons
3. The output is noisy
4. Both 2 and 3 above
1-62. Generally, tetrodes have a lower
transconductance than triodes. This is
caused by what feature of a tetrode?
1. The plate is isolated from the
electron stream
2. The screen grid draws current from
the electron steam
3. Secondary emission limits the
amount of current the plate can draw
from the electron stream
4. The screen grid is operated at a
negative potential relative to the
plate and electrons are repelled from
the plate
1-63. The suppressor grid of a pentode is
operated at what potential relative to
(a) the cathode and (b) the plate?
1. (a) Positive
(b) The same potential
2. (a) Negative
(b) The same potential
3. (a) The same potentia
(b) Negative
4. (a) The same potential
(b) Positive
1-64. Voltage is supplied to the suppressor
grid in a pentode from what source?
1. Through a resistor from the plate
source voltage
2. Through a resistor from ground
3. By a separate voltage source
4. By a physical connection from the
cathode
1-65. The suppressor grid is able to control the
effects of secondary emission by using
which of the following electronic
actions?
1. By attracting electrons emitted by
the plate through electromagnetic
attraction
2. By repelling electrons emitted by
the plate through electromagnetic
repulsion
3. By attracting electrons emitted from
the plate through electrostatic
attraction
4. By repelling electrons emitted from
the plate through electrostatic
repulsion
