Propane is safer and faster than acetylene but is more expensive than other fuels.

• A. True
• B. Not sure
• C. Only for large jobs
• D. False

Answer: (D)

In oxy-fuel welding and cutting, how hot the flame is and how safely you can handle the gas drive both speed and practicality. Acetylene provides a hotter flame than propane, especially with oxygen, so it generally delivers heat faster for welding and cutting. Propane is considered safer to store and handle than acetylene because acetylene can be unstable under pressure and requires special cylinders and handling. Regarding cost, propane is typically cheaper than acetylene for the same amount of heat, and many other fuels can vary in price, but propane isn’t reliably more expensive than “other fuels.” So the statement mixes accuracy about speed and safety and makes a broad, incorrect claim about cost, making it false.