Question 562General Subjects - Assistant Engineer

The correct answer is B) 500 gpm. The reasoning is as follows: For a pneumatic instrument system with a calibrated scale of 0 to 1000 gpm, and a standard instrument air pressure range of 3 to 15 psig, the instantaneous flow rate would be directly proportional to the transmitted pressure. Since the given pressure is 9 psig, which is the midpoint of the 3 to 15 psig range, the corresponding flow rate would be 500 gpm, which is the midpoint of the 0 to 1000 gpm calibrated scale. The other options are incorrect because they do not accurately represent the proportional relationship between the input pressure and the indicated flow rate for this type of pneumatic instrumentation system.