Question 565General Subjects - Assistant Engineer

The correct answer is C) 3 to 15 psig. This is the common industry standard for pneumatic signal pressure range in instrumentation and control systems. This pressure range is widely used because it provides a reliable and consistent signal transmission, and is compatible with a variety of pneumatic instruments and control devices. The other answer choices are not the standard pressure range - 0 to 10 psig (A) is too low, while 0 to 100 psig (B) and 3 to 150 psig (D) are significantly higher than the typical 3 to 15 psig range used in most pneumatic instrumentation and control applications.