Explanation:

String efficiency is defined as the ratio of the power delivered to the load to the power supplied to the transmission line. It is given by:

String Efficiency = (PL / PS) x 100%

where PL is the power delivered to the load and PS is the power supplied to the transmission line.

When the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency will remain unchanged. This is because the string efficiency is not affected by the frequency of the transmission system.

Factors affecting string efficiency:

There are several factors that can affect the string efficiency of a transmission line, including:

1. Line impedance: The impedance of the transmission line can affect the string efficiency. Higher line impedance can cause greater power losses, which can lower the string efficiency.

2. Load impedance: The load impedance can also affect the string efficiency. Lower load impedance can cause greater power losses, which can lower the string efficiency.

3. Length of the transmission line: The length of the transmission line can affect the string efficiency. Longer transmission lines can cause greater power losses, which can lower the string efficiency.

4. Power factor: The power factor of the load can also affect the string efficiency. Lower power factor can cause greater power losses, which can lower the string efficiency.

Conclusion:

In conclusion, the frequency of a transmission system does not affect the string efficiency. The string efficiency is determined by several factors such as line impedance, load impedance, length of the transmission line and power factor.

May increase or decrease