# In transmission lines distribution constants are

Electrical Engineering XYZ MCQs

In transmission lines distribution constants are:

1. Resistance
2. Inductance and resistance
3. Inductance and capacitance
4. Both 1 and 3

Correct answer: 4. Both 1 and 3

Explanation: Transmission lines exhibit distributed constants which are parameters distributed along the length of the line. These constants are primarily resistance (R), inductance (L), and capacitance (C).

1. Resistance (R): This is the inherent resistance of the conductors in the transmission line. It causes power loss in the form of heat as current flows through the line.
2. Inductance (L): This arises due to the magnetic fields generated around the conductors as current flows through them. It opposes changes in current and thus affects the transmission characteristics of the line.
3. Capacitance (C): This arises due to the electric fields between the conductors. It stores energy in the electric field and affects the propagation of voltage along the line.

Therefore, the distributed constants in transmission lines include resistance (1) and capacitance (3). Inductance (2) is also a distributed constant, but it is not listed in the options. Hence, option “Both 1 and 3” is the correct choice.