Transmission Lines, Losses and Parameters

Question 1

Since long conductors have a magnetic field about them when electrical energy is being passed
through them, they also exhibit the properties of inductance

Answer 1

Transmission line

Question 2

A transmission line has the properties of inductance, capacitance, and resistance just as
the more conventional circuits have. Usually, however, the constants in conventional
circuits are lumped into a single device or component.

Answer 2

LUMPED CONSTANTS

Question 3

Transmission line constants, called —, are spread along the entire
length of the transmission line and cannot be distinguished separately

Answer 3

DISTRIBUTED CONSTANTS

Question 4

When current flows through a wire, magnetic lines of force are set up around the wire. As
the current increases and decreases in amplitude, the field around the wire expands and
collapses accordingly

Answer 4

Inductance of a Transmission Line

Question 5

The two parallel wires act as plates of a capacitor and that the air between them acts
as a dielectric

Answer 5

Capacitance of a Transmission Line

Question 6

This resistance is usually expressed in ohms per unit length and is shown as existing
continuously from one end of the line to the other.

Answer 6

Resistance of a Transmission Line

Question 7

Since any dielectric, even air, is not a perfect insulator, a small current known as – flows between the two wires

Answer 7

Leakage Current

Question 8

the input impedance of a transmission line either infinitely long or
terminated in a pure resistance exactly equal to its characteristic impedance.

Answer 8

Character Impedance

Question 9

another name for characteristic impedance.

Answer 9

Surge Impedance