Question

Shutoff valves are designed so that they can be operated by hand:

A) Only if they are properly lubricated
B) In case of an emergency or power failure
C) Only when using a special wrench
D) At all times, without any additional tools

Answer 1

Shutoff valves are designed to be operated at all times, without any additional tools. They are used to control the flow of fluid or gas in plumbing systems.

Step-by-step explanation:

Shutoff valves are designed to be operated at all times, without any additional tools. The correct answer is D. Shutoff valves are typically installed in plumbing systems and are used to control the flow of fluid or gas. They are designed with a handle or lever that can be operated manually, allowing the user to open or close the valve as needed. The purpose of shutoff valves is to provide a means of quickly stopping the flow of fluid in case of an emergency or when maintenance work needs to be done.