Refrigerated Machine Operator Phase 8 - Final Exam Study Questions and Answers
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Course
Refrigeration machine operator
Institution
Refrigeration Machine Operator
Which of the following is used for piping natural gas? - Answer-Black iron
What material is used for refrigerant piping, heating, AC, and refrigeration? - Answer-Copper tubing
What material is most commonly used today for cold water piping in houses? - Answer-P VC
What material is used for...
Refrigerated Machine Operator Phase 8 -
Final Exam Study Questions and
Answers
Which of the following is used for piping natural gas? - Answer-Black iron
What material is used for refrigerant piping, heating, AC, and refrigeration? - Answer-
Copper tubing
What material is most commonly used today for cold water piping in houses? - Answer-
P VC
What material is used for natural gas piping? - Answer-Iron pipe
List the pipe and tubing used HVACR - Answer-Copper, aluminum, steel, PVC, CP VC
Which of the following will occur is copper is bent? - Answer-It will harden
Which phrase best describes the process of heating copper tubing to temperature of
1300°F? - Answer-Annealing
Types of copper to be in an order of wall is from light to heavy are calling: - Answer-L,
M, and K
What does M, L, K referred to in copper tubing? - Answer-Wall thickness
What is the nominal size of pipe or tubing? - Answer-The approximate inside diameter
If "M" designates A certain wall thickness in ACR copper tubing, what does "M" stand
for? - Answer-M stands for light or thin wall thickness and cannot be used on
pressurized refrigeration lines
If "L" designates A certain wall thickness in ACR copper tubing, what does "L" stand
for? - Answer-"L" is most frequently used for normal refrigeration applications
If "K" designates A certain wall thickness in ACR copper tubing, what does "K" stand
for? - Answer-"K" is heavy wall tubing meant for special use where abnormal conditions
of corrosion might be expected
To allow two pieces of copper tubing to be joined by soldering or brazing without any
fitting, which of the following must be used? - Answer-Swage joint
,Compression nut, a compression sleeve, and a ferrule, comprise which of the following?
- Answer-Compression joint
The preferred method of cutting copper tubing for a refrigeration system is with: -
Answer-A tubing cutter
Soft copper tubing can be joined by: - Answer-Brazing, soldering, flooring, or
compression
What are the basic methods copper tubing can be joined? - Answer-Brazing, soldering,
compression, flare
Which of the following categories of pipe is black pipe? - Answer-Iron pipe
Galvanized iron pipe has been dipped in molten zinc to make it: - Answer-Corrosion
resistant
The most accurate dimensions and pipe and tubing is: - Answer-The outside diameter
The outside diameter of schedule 40 black iron pipe is approximately: - Answer-1/4 inch
larger than the pipes nominal size
Why does iron pipe need to be dipped in zinc? - Answer-To make it corrosion resistant
The steps to connect PVC and CPVC pipe include: - Answer-Cleaning, priming,
applying solvent, fitting in the pipe
The preferred tool for cutting PVC pipe is: - Answer-Plastic tubing shear
PVC solvent will normally work with: - Answer-PVC pipe only
The process of annealing makes copper tubing what? - Answer-Soft and flexible
What is hard drawn copper tubing? - Answer-Ridgid
ACR is a type L that has been: - Answer-Dehydrated
ACR tubing is cleaned, decreased, dehydrated, and sealed to keep its: - Answer-Inside
is clean
ACR copper tubing is: - Answer-Type L, dehydrated copper tubing
Soldering can be done at __________ ___________ 840°. - Answer-Less than
Brazing can be done at ___________
__________ 840°. - Answer-Greater than
, Why should you be wearing safety glasses with the shade of 11 create a hazardous
situation? - Answer-Shade 11 glasses may obscure vision while soldering.
How can technicians protect themselves from hot sparks produced by most welding
processes? - Answer-Where heavy protective clothing, gloves, and eye protection.
Why are face shields worn during arc welding? - Answer-To protect technicians from
strong ultraviolet (UV) light
What material should clothing worn during welding be made of? - Answer-100% cotton
What is A potential complication that is unique to braising? - Answer-Overheating the
pipe can result in excess of oxidation, improper cleaning of the pipe can reduce
bonding, hitting the joint before the pipe can result in him proper fit, overheating the
paint can result in leakage.
Which of the following statements is true? - Answer-All braising alloys containing
phosphorus do not require flux.
Difference between braising and soldering is that: - Answer-Brazing occurs at higher
temperatures than soldering.
At what temperature does braising take place? - Answer-Above 840°
Most air-conditioning manufactures specify that refrigerant lines should be: - Answer-
Brazed
Which torch type would be the best choice for a braising project? - Answer-
Oxyacetylene torch
What equipment is required to operate in Oxyacetylene torch that is not required by
other torches? - Answer-Oxygen cylinder
What is the purpose of the acetylene and oxygen regulators? - Answer-To reduce the
tank pressures and maintain a steady pressure to the torch.
What is the advantage of any Oxyacetylene torch compared to an air- acetylene torch? -
Answer-Oxy-acetylene torches do not oxidize metal when heating it like acetylene
torches.
Why are acetylene cylinders only used in the upright position? - Answer-To prevent
acetone from being pulled out of the cylinder.
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