Automotive Service Technician Period 1 Practice Exam

Oxygen hoses used with oxyacetylene equipment are which color?

Green Blue Red Yellow

Correct Answer:

Green

Explanation:

Gas hose color coding helps you identify which gas is flowing so you don’t mix them up. In oxygen–acetylene setups, the hoses are color coded: oxygen is green, acetylene is red, and fuel gases are yellow. This distinction matters because oxygen supports combustion, so using the wrong hose with the wrong gas can create a dangerous situation or fire hazard. The green color for oxygen is chosen to clearly separate it from the red acetylene hose and the yellow fuel-gas hoses, reducing the risk of cross-connection. Blue isn’t the standard color for oxygen in typical oxyacetylene systems. So the oxygen hoses are green.

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