Question
Which of the following statements are correct:
A. A negative feedback can increase linearity and reduce distortion.
B. Positive feedback always improves stability of the amplifier.
C. Series-shunt (Voltage) negative feedback tends to reduce output impedance.
D. Closed-loop bandwidth typically increased when negative feedback is applied.
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, C, D only
The given question asks to identify the correct statements regarding the impact of feedback on electrical circuits, specifically amplifiers. Here's a step-by-step evaluation of each statement:
-
Statement A: A negative feedback can increase linearity and reduce distortion.
- Negative feedback is known to improve the performance of amplifiers by increasing linearity and reducing distortion. It stabilizes the gain, making the system more linear and reducing any non-linear distortion.
- Therefore, statement A is correct.
-
Statement B: Positive feedback always improves stability of the amplifier.
- Positive feedback tends to push systems towards instability in amplifiers, as it amplifies the signal further, potentially leading to oscillations or undesirable conditions. Stability is usually compromised with positive feedback.
- Hence, statement B is incorrect.
-
Statement C: Series-shunt (Voltage) negative feedback tends to reduce output impedance.
- Series-shunt feedback, also known as voltage feedback, typically reduces the output impedance of the amplifier. This is beneficial because lower output impedance can improve the driving capability of the amplifier into a load.
- Thus, statement C is correct.
-
Statement D: Closed-loop bandwidth typically increases when negative feedback is applied.
- Applying negative feedback to an amplifier often results in a wider bandwidth, known as bandwidth extension. This is because negative feedback flattens the frequency response of an amplifier.
- Hence, statement D is correct.
Based on the above evaluations, the correct statements are A, C, and D. Therefore, the correct answer is:
A, C, D only
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