101k Flashcards

1
Q

What are the grooves at the bottom of tube cutters for

A

Cutting flares

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2
Q

A flaring tool and flare is always

A

45°

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3
Q

When swedging what should you add

A

Oil

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4
Q

Annealed copper is hard of soft?

A

Soft

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5
Q

Pure acetylene is

A

High flammable
Colorless
Non pungent odor

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6
Q

Another name for acetylene tank is

A

B tank

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7
Q

When storing a cylinder always have the pressure at

A

0 psi

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8
Q

Regulators on acetylene tanks reduce psi from

A

250 to 15psi

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9
Q

Acetylene hoses are

A

Red

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10
Q

Oxygen hoses are

A

Green

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11
Q

Two types of copper

A

Hard drawn and soft drawn(annealed)

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12
Q

What is cutting fluid used for

A

Keep tool and material cool
Reduce power consumption

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13
Q

Two widths of copper

A

L and K

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14
Q

What color is k tubing

A

Green paint

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15
Q

What color is L tubing

A

Blue

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16
Q

What type of tubing do we not use in refrigeration

A

M and it’s red

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17
Q

A coupling fitting

A

Both sides are the same and go onto a smaller pipe

18
Q

ELL 90 fitting

A

Both sides are the same

19
Q

Street ELL 90 fitting

A

Both sides are different

20
Q

Redcuing coupling fitting is a

A

Bigger fitting to smaller (5/8- 3/8)

21
Q

Iron pipe is also called

A

Steel pipe

22
Q

Iron pipe is only used with

23
Q

Two types of iron pipe used in refrigeration

A

Standard schedule #40
Extra strong schedule #80

24
Q

Fitting allowance is

A

Throw of the fitting - thread engagement

25
The short length of threading that goes into the fitting is called
Thread engagement
26
Hard soldering is also known as
Silver soldering
27
Hard soldering or silver soldering/brazing uses temperatures of over
800°F
28
Soft soldering uses temperatures under
800°F
29
95/5 solder composition
95% tin 5% antimony
30
95/5 solder flow point °F
465°F
31
95/5 solder can be used from copper to
Steel Brass Copper
32
The space between the pipe and the fitting is called
Capillary gap
33
Solder fills the gap between the pipe and fitting with
Capillary action
34
Do not apply flux with hands what should you use
Brush
35
If excessive amounts of flux is put on pipe what will happen
May cause excessive corrosion
36
Overheating flux can cause
Solder to not flow properly into joint
37
Allow joint to cool naturally, cooling it quick is called
Shock cooling
38
Brazing filler metals melt at temperature between °F
1100°F-1500°F
39
Silfos (silver alloy brazing 15) composition is
85% copper 15% silver Use phosphorus flux
40
Silver alloy wires composition is
45% silver with Copper Zinc Cadmium No flux
41
Silver alloy wire is used to
Join ferrous and non ferrous metals that melt above 1500°
42
Hottest point of the torch flame
Feather