NEW
Font size
WorksheetsPAC Pre-test
Total questions: 13
Worksheet time: 7mins
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
Which of the following is NOT an advantage of using plasma arc cutting (PAC) over traditional thermal cutting methods?
Lower cost
Higher precision
Faster cutting speed
Less heat affected zone
Which gas is commonly used in plasma arc cutting to create the plasma?
Oxygen
Argon
Hydrogen
Compressed shop air
In plasma arc cutting, what is the purpose of the nozzle?
To cool the plasma
To focus the plasma jet
To increase the gas pressure
To reduce the noise
