Electrical Engineering XYZ MCQ on Power Transmission lines
Effect of capacitance is negligible in case of:
- Short transmission lines
- Medium transmission lines
- Long transmission lines
- All of these
Correct answer: 1. Short transmission lines
Also see: The lines below what length are considered short transmission lines
Explanation: Capacitance becomes negligible in the case of short transmission lines. In a transmission line, capacitance is one of the three primary parameters, along with inductance and resistance. The capacitance of a transmission line depends on the length of the line and the spacing between conductors.
For short transmission lines, the length is relatively small, and as a result, the capacitance is low. In short lines, the time it takes for the electric field to charge and discharge the capacitance is small compared to the time it takes for the signals to propagate down the line. Therefore, the effect of capacitance is considered negligible in short transmission lines.