Answer :
Final answer:
The pneumatic output of a 3 - 15 psi instrument at 50% equates to an actual output pressure of 9 psi. This is calculated by adding half of the range (6 psi) to the minimum value (3 psi). Therefore correct option C. 9 PSI
Explanation:
The pneumatic output of a 3 - 15 psi instrument at 50% is determined by calculating the midpoint of the range. To find the output, we take the range of 15 psi - 3 psi, which is 12 psi. This full range corresponds to 100%, so 50% of this range is 6 psi. However, since the scale starts at 3 psi, we need to add the 50% value to the starting point, giving us 3 psi + 6 psi which equals 9 psi. Thus, the actual output in pressure is 9 psi.
