Question

The band width, in a feedback amplifier.

(a) Remains unaffected

(b) Decreases by the same amount as the gain increase

(c) Increases by the same amount as the gain decrease

(d) Decreases by the same amount as the gain decrease

The question was posed to me by my school principal while I was bunking the class.

My doubt stems from The Approximation of Higher-Order Systems by Lower-Order in portion Time Response Analysis, Design Specifications and Performance Indices of Control Systems

Answer 1

Correct choice is (c) Increases by the same amount as the gain decrease

For explanation: The bandwidth of closed loop system increases hence increasing the noise due to increased bandwidth.