Question 377Electricity & Electronics - QMED

The correct answer is D. The talking circuit is a common circuit and the ringing circuit is a selective circuit. In a sound-powered telephone system, the talking circuit is a common circuit, meaning it is shared by all stations on the system. This allows any station to communicate with any other station. The ringing circuit, on the other hand, is a selective circuit, which means it can selectively ring individual stations or groups of stations as needed. The other answer choices are incorrect because they do not accurately describe the relationship between the talking and ringing circuits in a sound-powered telephone system.