8 Figure 1C. Basic tetrode circuit. 1-60.     What is the function of C_sg 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