Electronics Engineering (ELEX) Board Practice Exam

On what factor does the sensitivity of a closed-loop system to gain changes depend?

1. Input frequency

2. All of the choices

3. Output load conditions

4. Temperature variations

The correct answer is: All of the choices

The sensitivity of a closed-loop system to gain changes is influenced by multiple factors, which is why the answer encompasses all the choices. When we consider input frequency, the behavior of the system can vary based on the frequency of the input signal. Feedback systems may exhibit different levels of sensitivity to gain changes at different frequencies due to phase shifts and possible resonance effects. Output load conditions also play a critical role. A closed-loop system may respond differently to variations in load, potentially altering its gain and, subsequently, its sensitivity. If the load changes, the dynamics of the system can shift, requiring adjustments or leading to variations in performance that affect how sensitive the system is to alterations in gain. Temperature variations can affect the components used in the system. Components may drift from their nominal values due to temperature changes, impacting the overall gain and subsequently modifying how sensitive the system is to gain variations. Considering these interrelationships, it's evident that the sensitivity of a closed-loop system to gain changes does not rely on a single factor. Instead, it is a comprehensive dependency on input frequency, output load conditions, and temperature variations, all contributing to the overall system behavior.