Explanation: Circuit theory assumes physical dimensions of the network smaller than electrical wavelength, while transmission lines may be considerable fraction of wavelength.

Explanation: Since no lumped elements like resistors, capacitors are used at microwave frequencies, only transmission lines are used. Hence they are called distributed parameter network.

Explanation: With a single conductor, transverse electromagnetic wave propagation is not possible. Hence we need a minimum of 2 conductors.

Explanation: In the lumped element circuit model of a transmission line, we use only resistor, capacitor and inductor. Hence no transistor is used.

Explanation: Z=R+jωL. Hence, both resistor and inductor contribute to the impedance of the transmission line.

Explanation:Y=G+jωC. Hence, both conductance and capacitance contribute to the admittance of the transmission line.

Explanation: Characteristic impedance is defined as that impedance of a line which is a constant when measured at any point on the line, Hence B.

Explanation: Since propagation constant is a complex value, containing attenuation constant α, phase constant β respectively as their real and imaginary parts.

Explanation: α is the real value of propagation constant, also signifies the loss that the transmission line causes and hence the total amount of energy transmitted. Hence all the mentioned.

Explanation: Propagation constant is a complex sum of α and β, α being the real value and β being the complex part.

Explanation: Characteristic impedance Zₒ is the square root of ratio of impedance and admittance of the transmission line.

Explanation: Propagation constant is the root of product of impedance and admittance of the transmission line.