RAC 40 Quiz 7 Review Questions and Answers All Correct
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Course
RAC 40
Institution
RAC 40
RAC 40 Quiz 7 Review Questions and Answers All Correct
When When making a swage joint, what should the depth of the enlarged portion of the tube be? - Answer- Depth depends on the diameter of the tubing and should have the same measurements as the diameter of the tubing
The type of steel pipe t...
RAC 40 Quiz 7 Review
Questions and Answers All
Correct
When When making a swage joint, what should the depth of the enlarged portion of the
tube be? - Answer- Depth depends on the diameter of the tubing and should have the
same measurements as the diameter of the tubing
The type of steel pipe thread used primarily in this industry is the "tapered" thread.
Why? - Answer- tapered has a better fit
When soldering, what is the flow of molten filler material between the two base metals
called? - Answer- Capillary attraction
What are two purposes for using insulation on the suction line? - Answer- 1. to prevent
sweating on suction line which could cause water damage in the future
2. to maintain proper super heat
What is a compression fitting used for? and what is a ferrule? - Answer- Used for
connecting copper tubing through a compression process. comes with a nut and ferrule:
which is the ring that compresses the tubing making a sealed connection as you tighten
the nut the ferrule squeezes the tubing
Before you heat a joint it is good practice to introduce ________________ into the
system - Answer- Dry nitrogen
Give the brazing temp ranges __________ to ___________ - Answer- 1205 F to 1550 F
Give the soldering temp ranges ___________ to ___________ - Answer- 361 F to 500
F
Name 4 common heat sources used for soldering and brazing - Answer- mapp gas, air-
acetlyne, oxy-acetlyne, propane
Tubing that can be purchased in bundles that have insulated pipes are called? and what
are they used for? - Answer- Line sets, they are used for split systems
, If I have some 1/2 in. hard drawn ACR pipe and want to flare the end of the pipe then
bend it 90 deg. with my bender what should I do? - Answer- you would have to anneal
the pipe so that you can create the flare and make he 90 degree bend. annealing is
done by heating the pipe till its cherry red then letting it cool down slowly.
Finish this paragraph: The piping system provides.... - Answer- a path for refrigerant to
flow to all components. it also provides a steady environment for refrigerant to reach
high and low pressure. allows oil to return to the compressor
What is propress? and how would we use it in HVAC? - Answer- a propress is a type of
connection that allows tubing to be connected without soldering. this connection has a
place to insert the tubing at each end and a special tool is needed to press the fitting.in
HVAC we would use this more for drains. The one for refrigerant would be zoom lock.
Describe how to prep repairing a leak on a system that still has pressure in it. - Answer-
I would get my recovery tank and recover all the refrigerant in the system. Once system
is at atmospheric pressure. I will get my nitrotank and purge system with nitro. Then get
my mapp gas or air acetylene tank and solder to repair the leak
BAg stands for - Answer- brazing silver
Oxygen tanks connections are ______________ threads - Answer- right hand thread
Flux contains ________ to _________ water - Answer- 15%, 35%
Anytime copper tubing is heated to a temp until cherry red. What accumulates inside
and outside of the pipe? - Answer- Oxidation
BCup stands for - Answer- brazing and copper phospherous
Acetylene tanks are _______________ threads. - Answer- lefthand
Space between fittings in copper pipe where the filler flows is approx. ____________in.
- Answer- 0.003
After soft soldering flux should be wiped off because it is _________________ -
Answer- it is acidic
Air acetylene torch has a flame temp of __________ deg f. - Answer- 5589
Recommended type of solder to use on a copper suction line to a brass accessory
valve? - Answer- 45% silver unlike metals
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