16 3-11.   What transmission-line loss is caused by magnetic lines of force not returning to the conductor? 1.  Copper 2.  Radiation 3.  Induction 4.  Dielectric 3-12.   What is the electrical wave-length of 1 cycle if the frequency is 60 hertz? 1.       125,000 meters 2.    1,250,000 meters 3.    5,000,000 meters 4.  20,000,000 meters 3-13.   A transmission line 10 meters in length is considered to be electrically long at which of the following frequencies? 1.    60 kilohertz 2.  600 kilohertz 3.      6 megahertz 4.    60 megahertz 3-14.   The conductance value of a transmission line represents which of the following values? 1.  Expected value of current flow through the insulation 2.  Expected value of voltage supplied by the transmitter 3.  Value of the lump and distributed constants of the line divided by impedance 4.  Value of the lump and distributed constants of the line divided by impedance 3-15.   Electrical constants in a transmission line are distributed in which of the following ways? 1.  Into a single device 2.  Along the length of the line 3.  According to the thickness of the line 4.  According to the cross-sectional area of the line 3-16.   Leakage current in a two-wire transmission line is the current that flows through what component? 1.  The resistor 2.  The inductor 3.  The insulator 4.  The conductor 3-17.   Conductance is the reciprocal of what electrical property? 1.  Inductance 2.  Resistance 3.  Capacitance 4.  Reciprocity 3-18.   A transmission line that has current flowing through it has which, if any, of the following fields about it? 1.  Electric field only 2.  Magnetic field only 3.  Both electric and magnetic fields 4.  None of the above 3-19.   Maximum transfer of energy from the source to the transmission line takes place when what impedance relationship exists between the source and the transmission line? 1.  When the load impedance equals source impedance 2.  When the load impedance is twice the source impedance 3.  When the load impedance is half the source impedance 4.  When the load impedance is one-fourth the source impedance 3-20.   The characteristic impedance (Z₀) of a transmission line is calculated by using which of the following ratios? 1.  R_s to R_load of the line 2.  I_max to I_min at every point along the line 3.  E to I at every point along the line 4.  E_in to E_o of the line