Question

With a negative feedback, the system gain and stability _______ respectively.

• A. decreases, increases
• B. increases, decreases
• C. increases, increases
• D. decreases, decreases

Hint:

Negative feedback = lower gain, better control, improved stability and reduced sensitivity to parameter variation.

Answer 1

The Correct Option is A

Step 1: Define negative feedback.
Negative feedback occurs when a portion of the output is subtracted from the input. It reduces the effective input. 
Step 2: Effect on gain.
With negative feedback, the system's open-loop gain reduces: \[ A_{closed} = \frac{A}{1 + A \beta} \] So gain decreases. 
Step 3: Effect on stability.
Negative feedback helps suppress oscillations, improve damping, and correct errors, making the system more stable. 
Conclusion: $\boxed{\text{gain decreases, stability increases}}$