Electrical Engineering XYZ MCQs
Which of the following is the characteristic of negative feedback control system:
- Reduction in gain at the expense of better stability
- Rejection of disturbance signals
- Low sensitivity to parameter variations
- All of the above
Correct answer: 4. All of the above
Explanation:
- Reduction in gain at the expense of better stability: Negative feedback control systems typically involve the adjustment of system parameters to reduce the gain of the system. This reduction in gain helps in stabilizing the system by preventing excessive oscillations or overshoots in the output. By sacrificing some gain, the system becomes more stable.
- Rejection of disturbance signals: Negative feedback control systems are designed to counteract disturbances that may affect the system’s performance. The negative feedback loop compares the output of the system to a desired reference value and applies corrective actions to minimize any discrepancies. This process helps in rejecting or minimizing the impact of external disturbances on the system’s output.
- Low sensitivity to parameter variations: Negative feedback control systems are inherently designed to be less sensitive to changes in system parameters. This is achieved by continuously monitoring the system’s output and adjusting the control inputs to maintain desired performance levels. By actively compensating for parameter variations, negative feedback control systems can ensure consistent and reliable operation even in the presence of uncertainties or changes in the environment.
Therefore, all of the options listed are characteristics of negative feedback control systems.