60. In which residential water lines should you expect to find potable water?
Answer: B
Potable water can be found in the incoming lines only.
In residential water systems, potable water is typically supplied through the incoming lines, which convey water from the municipal supply or well to the home. Outgoing lines, on the other hand, are used for wastewater disposal and should not contain potable water.
A) neither incoming nor outgoing lines
This option is incorrect as it suggests that neither type of line carries potable water. In reality, incoming lines are specifically designed to transport potable water into the home for consumption and use.
B) incoming lines only
This option is correct because incoming lines are the primary source of potable water in residential settings. They are responsible for delivering treated water suitable for drinking and other domestic uses, while outgoing lines handle wastewater.
C) outgoing lines only
This option is incorrect since outgoing lines are meant for the disposal of water that is no longer suitable for consumption, such as wastewater. Therefore, they do not contain potable water.
D) both incoming and outgoing lines
This option is also incorrect because it implies that outgoing lines carry potable water, which is not the case. Outgoing lines are designated for wastewater, and potable water should only be present in the incoming lines.
Conclusion
The correct answer is B, as potable water is exclusively found in the incoming lines of a residential water system. All other options fail to recognize the critical distinction between the function of incoming lines, which deliver safe drinking water, and outgoing lines, which serve to remove wastewater.