7 1-51.     A triode amplifier has a load resistor rated at 150 k W . A +3-volt signal will cause 4 milliamperes of current to conduct through the tube. What is the voltage gain of the amplifier?   1.    450   2.    200   3.    100   4.      50 1-52.     The amplification factor for an electron tube is identified by what electronic symbol?   1.    A_r   2.    V_g   3.    g_m   4. m 1-53.     The grid voltage on an electron tube is increased from 2 volts to 4 volts. This causes plate current to increase from 2 milliamperes to 5.5 milliamperes. This same increase in plate current can be achieved by keeping the grid at +2 volts and raising the plate voltage from 200 volts to 400 volts. What is the mu of the tube?   1.    400   2.    200   3.    100   4.      50 1-54.     What is the transconductance for the tube described in question 1-53?   1.      175 m mhos   2.      645 m mhos   3.      700 m mhos   4. 1750 m mhos 1-55.     Transconductance is identified by what electronic symbol?   1. m   2.    g_m   3.    rgk   4.    t_c 1-56.     In a triode, what interelectrode capacitance has the greatest effect on tube operation?   1.    C_pg   2.    C_gk   3.    C_pk   4.    C_sg 1-57.     Interelectrode capacitance (C_pg) affects the gain of a triode stage because of what electronic feature?   1.    Blocking   2.    Feedback   3.    Transit time   4.    Phase inversion 1-58.     The action of the screen grid in reducing interelectrode capacitance can be expressed mathematically as   1. 2. 3. 4. 1-59.     For normal operation, the screen grid of a tetrode is operated at a positive voltage in relation to (a) what tube element, and negative in relation to (b) what other tube element? 1.    (a) Grid (b) plate   2.    (a) Grid (b) cathode   3.    (a) Plate (b) grid   4.    (a) Cathod (b) grid