Question

Which feedback system is employed in DC amplifiers?

(a) Can be any positive or negative doesn’t matter

(b) Negative

(c) Depends on the application

(d) Positive

Answer 1

Right choice is (b) Negative

Explanation: DC amplifiers are generally of the negative feedback type. They are not practical for very low level applications because of dc drift and poor common-mode rejection capabilities. They are used for medium gain applications down to about 1 mV signal levels for full scale.