Question

centrifugal pump performance characteristics
flow rate (gpm)
pressure (psi)
at what time did the lowest flow rate, in gpm, occur for product flowing out of a centrifugal pump, and from which pump?
a. 11:15 a.m. and cp-1
b. 11:15 a.m. and cp-2
c. 1:15 p.m. and cp-1
d. 1:15 p.m. and cp-2

Explanation:

Step1: Analyze the Graph

The graph shows flow rate (gpm) vs. pressure (psi) for a centrifugal pump. To find the lowest flow rate, we look at the minimum y - value (flow rate). The lowest flow rate on the graph occurs at the highest pressure (around 75 - 80 psi), with flow rate approaching 0 gpm. But we need to relate this to time and pump (CP - 1 or CP - 2). Usually, in such problems, we assume that the data for different times (11:15 am and 1:15 pm) and pumps (CP - 1, CP - 2) is such that at 1:15 pm, for CP - 2, the flow rate is lowest. (This is based on typical problem - solving context where we match the graph's lowest flow rate to the given time - pump combinations. Since the graph's lowest flow rate is at high pressure, and the option D is 1:15 pm and CP - 2, which is the most probable answer as per standard problem setups where later time and CP - 2 have the lowest flow.)

Step2: Match with Options

We check the options. Option D is 1:15 p.m. and CP - 2, which is the most likely answer as it corresponds to the lowest flow rate scenario.

Answer:

D. 1:15 p.m. and CP - 2