Question 142Electricity & Electronics - 1st Asst/Chief

The correct answer is B. The transducer in a digitized echo sounding system converts radio frequency (RF) electromagnetic energy to acoustic energy while transmitting, and then converts the reflected acoustic energy back into RF electromagnetic energy while receiving. This is the fundamental function of a transducer in an echo sounder - to convert between electrical and acoustic energy in order to transmit a signal and receive the echoes. The other options are incorrect because they do not accurately describe the transducer's function. Options A, C, and D incorrectly state that the transducer uses audio frequency (AF) or transmits while receiving, which is not how echo sounders operate.