[D2L] 101K Flashcards
What part of soldering and brazing is abrasive cloth applied?
Before soldering and brazing
What tool is used to clean ridges and burrs left on copper pipe after cutting?
Pipe reamers
A hacksaw can be used to cut refrigeration lines.
T or F
True
When you are brazing or soldering what will you get in the habit of always having within easy reach
Fire extinguisher
What is the flare angle for refrigeration copper tube?
1) 30
2) 36
3) 45
4) B and C
45
Always store acetylene cylinders in on their side.
T or F
False
upright & secured
How many turns should an acetylene bottle’s valve stem be opened?
1/4 turn
Why is copper ideal for refrigeration and air conditioning?
1) weathers well
2) withstands limited abuse such as weather effects and being hit with debris
3) does not react negatively with halocarbon refrigerants
4) all of the above
all of the above
What negative affect does annealing copper pipe have?
Weakens the tube
ACR copper tube is dehydrated and slightly pressurized with nitrogen
T or F
True
What copper tubing has the thickest wall?
Type K
Iron pipe, black iron pipe, and steel pipe are all the same
T or F
True
What is the formula to calculate fitting allowance of black iron pipe?
Throw minus the thread engagement equals the fitting allowance
Fitting allowance = Throw - Thread engagment
What is the capillary gap with pipework?
The space between the pipe and the fitting
What type of filler material would you use to connect copper pipe to a steel fitting in a refrigeration system?
Silver alloy wire (Easy flow 45)
What temperature range does soft molder melt at?
Above 400 F and below 800 F
Brazing is classified as any soldering procedure that uses temperatures from 800 F and above.
True
How is a Bushing different than a Reducing coupling?
a bushing has a hub on 1 side and the other side fits inside a hub
It is possible to overheat flux and burn it off preventing a successful joint
T or F
True
What pressure does an acetylene gas regulator drop the tank pressure from/to?
250 psi down to 15 psi
Which type of copper tube is used only for water supply and small drain lines?
1) DVW
2) K
3) L
4) M
M (plumbing)
What is a street elbow?
A bent, copper fitting with one cup end
95/5 Solder is made of
Tin and Antimony
What type of filler material is typically used for waterlines and drain lines
95/5
Tube is measured in
Inside diameter
Copper Pipe is measured in
Outside diameter
Black iron pipe is measured in
Nominal inside diameter