Electrical

# Which of the following are the constants of the transmission lines?

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Which of the following are the constants of the transmission lines?

(A) Resistance

(B) Inductance

(C) Capacitance

(D) All of the above.

## Answer: (D) All of the above

Explanation:

• a b c d constants of the transmission line( Primary line constants)
• The line constants are parameters that describe the characteristics of conductive transmission lines.

The primary line has the following constants

R = Resistance per unit length Ω

L = Inductance per unit length (Henry) H

C = Capacitance per unit length (Henry) H

G = Conductance per unit length ℧

All these constants are independent of frequency, therefore, they are called primary constants and these constants are measured by considering both the wires of the transmission lines.

R and L elements are in series with the line (because they are properties of the conductor) and C and G are elements shunting the line (because they are properties of the dielectric material between the conductors).

G represents leakage current through the dielectric and in most cables is very small.

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