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Q: What is the function of a non-return valve?
  • A. Allow the flow of liquid in one direction and prevents if from flowing back in opposite direction in a pipe flow system
  • B. Allows flow of liquid in a direction opposite to the pumping direction of liquid
  • C. Allow the flow of liquid in both upward and downward direction in a pipe flow system
  • D. Blocks the flow of fluid in all directions in a pipe flow system
Correct Answer: Option A - Check valves or Non-return valves–Check valves are also known as non-return valves because they allow the flow of liquid in one direction and prevents it from flowing back in opposite direction in a pipe flow system.
A. Check valves or Non-return valves–Check valves are also known as non-return valves because they allow the flow of liquid in one direction and prevents it from flowing back in opposite direction in a pipe flow system.

Explanations:

Check valves or Non-return valves–Check valves are also known as non-return valves because they allow the flow of liquid in one direction and prevents it from flowing back in opposite direction in a pipe flow system.