test01

THERMAL CUTTING PROCESSES

No.

Question

A

B

C

D

Answer

1
The preheat orifices on a oxyacetylene cutting torch are adjusted to a __________flame.

A. neutral

B. oxidize

C. reduce

D. carburize

2
When a cutting attachment is added to a welding torch body, the torch oxygen valve is opened

A. one complete turn

B. half way

C. completely

D. 2-1/2 turns.

3
When cutting, the space left in the line of cut is called?

A. the drag

B. line of cut

C. lag

D. kerf.

4
Cutting tip size is determined by

A. material thickness

B. acetylene working pressure

C. the orifice diameter

D. both A and C.

5
In the hand held plasma arc cutting process, the plasma gas that is most commonly used is

A. oxygen

B. helium

C. compressed air

D. carbon monoxide.

6
The air carbon arc-cutting process uses a carbon electrode and a torch which supplies

A. compressed air to cool the work piece

B. Argon to protect the molten puddle

C. compressed air to blow away the molten metal

D. air and argon to the work zone.

7
What current and polarity are used in carbon arc cutting?

A. AC

B. DC EP

C. DC EN

D. all of the above

8
Plasma arc cutting can be used to cut

A. steel

B. stainless steel

C. aluminum

D. all of the above

9
Plasma-arc torches are capable of producing temperatures of

A. 25,000" F

B. 40,000" F

C. 5,8000” F

D. 10,0000” F

10
Which one of the following is not an electric arc cutting process?

A. shielded metal-arc cutting

B. air carbon arc

C. plasma arc cutting

D. oxyacetylene cutting.

11
The same style cutting tip can be used for

A. acetylene and mapp gas

B. propane and natural gas

C. argon and propane

D. acetylene and propane

12
OFC stack cutting is limited to plates up to ___ thick because of the difficulty in clamping heavier material in a light stack

A. 1/2"

B. 3/8"

C. 1/4”

D. 1/8"

13
Mild steel may be cut with the oxyacetylene process because

A. the gas pressure blows away the molten metal

B. a flame reduces the melting temperature of steel

C. the steel is melted in two by the intense heat of the flame

D. a chemical reaction occurs between the hot steel and the cutting oxygen.

14
Compressed air quality used in the PAC process must be

A. completely dry

B. moist

C. lubricated

D. CO2

No.	Question	A	B	C	D

1	The preheat orifices on a oxyacetylene cutting torch are adjusted to a __________flame.	A. neutral	B. oxidize	C. reduce	D. carburize
2	When a cutting attachment is added to a welding torch body, the torch oxygen valve is opened	A. one complete turn	B. half way	C. completely	D. 2-1/2 turns.
3	When cutting, the space left in the line of cut is called?	A. the drag	B. line of cut	C. lag	D. kerf.
4	Cutting tip size is determined by	A. material thickness	B. acetylene working pressure	C. the orifice diameter	D. both A and C.
5	In the hand held plasma arc cutting process, the plasma gas that is most commonly used is	A. oxygen	B. helium	C. compressed air	D. carbon monoxide.
6	The air carbon arc-cutting process uses a carbon electrode and a torch which supplies	A. compressed air to cool the work piece	B. Argon to protect the molten puddle	C. compressed air to blow away the molten metal	D. air and argon to the work zone.
7	What current and polarity are used in carbon arc cutting?	A. AC	B. DC EP	C. DC EN	D. all of the above
8	Plasma arc cutting can be used to cut	A. steel	B. stainless steel	C. aluminum	D. all of the above
9	Plasma-arc torches are capable of producing temperatures of	A. 25,000" F	B. 40,000" F	C. 5,8000” F	D. 10,0000” F
10	Which one of the following is not an electric arc cutting process?	A. shielded metal-arc cutting	B. air carbon arc	C. plasma arc cutting	D. oxyacetylene cutting.
11	The same style cutting tip can be used for	A. acetylene and mapp gas	B. propane and natural gas	C. argon and propane	D. acetylene and propane
12	OFC stack cutting is limited to plates up to ___ thick because of the difficulty in clamping heavier material in a light stack	A. 1/2"	B. 3/8"	C. 1/4”	D. 1/8"
13	Mild steel may be cut with the oxyacetylene process because	A. the gas pressure blows away the molten metal	B. a flame reduces the melting temperature of steel	C. the steel is melted in two by the intense heat of the flame	D. a chemical reaction occurs between the hot steel and the cutting oxygen.
14	Compressed air quality used in the PAC process must be	A. completely dry	B. moist	C. lubricated	D. CO2