Question 229Motor Plants - 1st Asst/Chief

The correct answer is B) The regulator, or pressure reducer, drops the supply pressure to the desired operating level. This is the correct answer because the function of the device labeled "C" in the illustration is to reduce the pressure of the supply air to provide the appropriate operating pressure for the ancillary main engine services. The regulator is used to convert the higher supply pressure to a lower, more suitable pressure for the system's components. The other answer choices are incorrect because they do not accurately describe the primary function of the pressure-reducing device labeled "C" in the illustration. Option A describes a relief valve, option C is redundant with the correct answer, and option D does not align with the role of the regulator in the system.