Which of the following would have different relative roughness values? Select all that apply.

Question

Accepted Answer

A 300mm diameter concrete pipe and a 300mm diameter PVC pipe.

Accepted Answer

A 150mm diameter cast iron pipe and a 300mm diameter cast iron pipe.

Answer

A 250 mm diameter ductile iron pipe with water flowing at 1 m/s and a 250 mm diameter ductile iron pipe with water flowing at 3 m/s.

Answer

A 250mm diameter stainless steel pipe conveying water and a 250mm diameter stainless steel pipe conveying oil.

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