Question 228Motor Plants - 1st Asst/Chief

The correct answer is B) detented, control air pressure, reducing and filtering unit. This is the correct answer because the circuit shown in the illustration represents a pneumatic control unit that reduces and filters the control air pressure, and has multiple detented positions to allow for precise control. This type of unit is commonly used in marine applications, such as with the US Coast Guard, to manage and regulate the airflow in various onboard systems. The other answer choices are incorrect because they do not accurately describe the specific type of pneumatic control unit represented in the illustration. Options A, C, and D describe different types of pneumatic or hydraulic control units that do not match the characteristics of the circuit shown.