Acetylene and oxygen produce the hottest flame.

• True

• False

The working pressure of oxygen in OFC is generally anywhere between 100-125 psi.

• True

• False

The most widely used fuel gas is propane.

• True

• False

To ensure that it is not possible for someone to connect the hose to the wrong gas, oxygen hose fittings have left-hand threads and fuel gas hoses have right-hand threads.

• True

• False

Never use copper tubing to transport acetylene gas.

• True

• False

Which of the following is NOT an advantage of OFC?

• The oxyfuel cutting system does not need electricity to run

• Cutting with an oxyfuel system is limited primarily to ferrous materials

• The oxyfuel cutting process is extremely portable

• The cost of the oxyfuel cutting equipment is low

• The oxyfuel cutting system is used in all positions and on thick and thin materials

Which of the following is NOT used as a fuel gas in OFC?

• Acetylene

• Propylene

• Ethylene

• Propane

• Natural gas

Acetylene is extremely unstable at pressure over ___ psi.

• 15

• 51

• 10

• 24

• All of the above

Which of the following produces the hottest flame?

• Natural gas and oxygen

• Propylene and oxygen

• Propane and oxygen

• Acetylene and oxygen

• Oxygen

If an acetylene cylinder has been mistakenly stored in a horizontal position, it must be returned to an upright position for a minimum of ___ hours before it is safe to use.

• 1

• 2

• 3

• 4

• 6