Explanation: A DC amplifier uses offset null circuitry to reduce the output offset voltage to zero, that is , to improve the accuracy of DC amplifier. 4. Why are coupling capacitor used in audio receiver system?
A. All of the mentioned
B. Thermal drift
C. Component tolerance
D. Variation in signal
Answer:A
Explanation: A DC amplifier uses offset null circuitry to reduce the output offset voltage to zero, that is , to improve the accuracy of DC amplifier. 4. Why are coupling capacitor used in audio receiver system?
A. All of the mentioned B. Thermal drift C. Component tolerance D. Variation in signal
Explanation: An audio receiver system consists of a number of stages because of thermal drift, components tolerance and variation, which introduces a dc level. To prevent the amplification of such dc level, the coupling capacitors are used. 5. Find the AC inverting amplifier from the circuits given below?