Deck 21: Oxyacetylene Cutting

Question 1

The kindling temperature of iron results in a ____ color.

A) pure white
B) light yellow
C) bright orange
D) dull red

Answer 1

D

Question 2

A pressure setting that is too high results in ____.

A) an incomplete cut
B) the top edge of the plate being melted or rounded off
C) gouges in the side of the cut
D) the sides of the kerf being slightly dished

Answer 2

D

Question 3

The diameter, or size of the center cutting orifice, determines the thickness of the metal that can be cut.

Answer 3

True

Question 4

Never use a cutting torch to cut open a used can, drum, tank, or other sealed container.

Question 5

Materials that are thick, are round, or have surfaces covered with rust, paint, oil, and so on, require less preheat flame.

Question 6

The kindling temperature of steel in pure oxygen is about ____.

A) 600 degrees F to 800 degrees F
B) 1200 degrees F to 1400 degrees F
C) 1600 degrees F to 1800 degrees F
D) 2000 degrees F to 2200 degrees F

Question 7

____ is used in tips having eight preheat holes or in a two-piece tip that is not recessed.

A) MPS gas
B) Acetylene
C) Natural gas
D) Propane

Question 8

If ____ is used in a tip that was designed to be used with one of the other fuel gases, the tip may overheat, causing a backfire or the tip to explode.

A) propane
B) natural gas
C) MPS
D) acetylene

Question 9

Most nonferrous metals-such as brass, copper, and aluminum-can be cut by oxyacetylene cutting.

Question 10

If ____ is used in a deeply recessed, two-piece tip, the tip will overheat, causing a backfire or the tip to explode.

A) acetylene
B) MPS gas
C) natural gas
D) propane

Question 11

When removing a cutting tip, if the tip is stuck in the torch head, tap the side of the tip with a plastic hammer.

Question 12

Sunglasses or other dark shaded glasses are safe to use for oxyacetylene cutting.

Question 13

Combination torches are usually longer and have larger gas flow passages than the dedicated cutting torches.

Question 14

A good oxyacetylene cut should not only be straight and square, but it also should require little or no postcut cleanup.

Question 15

If a cut is to be started in a place other than the edge of the plate, the inner cones should be held as close as possible to the metal.

Question 16

Too slow a cutting speed results in ____.

A) the top edge of the plate being melted or rounded off
B) an incomplete cut
C) gouges in the side of the cut
D) the sides of the kerf being slightly dished

Question 17

____ is used in tips having from one to six preheat holes.

A) Acetylene
B) MPS
C) Propane
D) Natural gas

Question 18

An excessive amount of preheat flame results in ____.

A) gouges in the side of the cut
B) the top edge of the plate being melted or rounded off
C) an incomplete cut
D) the sides of the kerf being slightly dished

Question 19

An injector-type torch must be used if a low-pressure acetylene generator or low-pressure residential natural gas is used as the fuel gas supply.

Question 20

Too fast a cutting speed results in ____.

A) the top edge of the plate being melted or rounded off
B) an incomplete cut
C) the sides of the kerf being slightly dished
D) gouges in the side of the cut

Question 21

The ____________________ temperature of a material is the temperature at which combustion (rapid oxidation) can begin.

Question 22

Most cutting tips are made of ____________________ .

Question 23

____________________ is when the metal bends or twists out of shape as a result of being heated during the cutting process.

Question 24

____________________ slag is very porous, brittle, and easily removed from a cut. There is little or no unoxidized iron in it.

Question 25

Keep the inner cones of the flame approximately 1/8 in. to 1/4 in. from the surface of the plate. This distance is known as the ____________________ distance.