PAC Pre-test

Plasma is the ___ state of matter.

• First

• Second

• Third

• Fourth

Plasma is formed by sending a(n) ___ through a pressurized gas passing through a nozzle.

• High frequency pulse

• Low frequency pulse

• Electric arc

• Positively charged particle stream

If enough heat is added to a gas, it becomes ___ and electrically conductive and changes into plasma.

• Collimated

• Ionized

• Sublimated

• Irradiated

• Fractured

The temperature of the plasma jet reaches up to ___ °F.

• 10,000

• 20,000

• 30,000

• 40,000

• 50,000

For thicknesses under ___, plasma arc cutting is more economical than OFC.

• 0.078 in. (2 mm)

• 0.196 in. (5 mm)

• 0.590 in. (15 mm)

• 0.984 in. (25 mm)

The plasma arc typically leaves a ___ bevel on the cut edge.

• 1 to 4°

• 8 to 12°

• 10 to 15°

• 15 to 20°

Which of the following is NOT a method of PAC cutting?

• Direct contact

• Standard contact

• Electrode contact

• Shielded contact

• Gouging

While you may not know what your exact travel speed is during a manual PAC cut, the trail of sparks coming out the other side of the material can let you know if you are close to the correct speed. The sparks should_____

• Trail at a slight angle

• Shoot straight down

• Shoot back up in your face

• There shouldn't be any sparks

Which is easier to remove?

• High-speed dross

• Low-speed dross

Which of the following is the smoothest motion, giving the best quality manual cut in PAC?

• Right to left

• Left to right

• Pushing away from you

• Pulling toward you

• Doesn’t make any difference