1010 unit 22,23,24,25
Which torch type would be the best choice for a soft soldering project? Question content area bottom Part 1 A. Oxyacetylene torch B. Air-fuel torch C. Air-MAPP swirl-tip Torch D. Air-propane swirl-tip torch
B
A column of liquid R-22 exerts 0.50 psi for every foot of height. If the pressure at the top of a 30-foot column of R-22 is 10 psi, what is the pressure at the bottom? Question content area bottom Part 1 A. 25 psi B. 30 psi C. 10 psi D. 15 psi
A
For an R-410a system, the saturation pressure at 38°F is 110 psig, and the saturation pressure at 36°F is 105 psig. What is the maximum pressure drop in this system? Question content area bottom Part 1 A. 5 psig B. 2 psig C. 0 psig D. 2.5 psig
A
How can nitrogen gas pose a potential safety hazard? Question content area bottom Part 1 A. Nitrogen gas does not irritate the lungs or eyes. B. Nitrogen gas creates harmful metal oxides. C. Nitrogen gas burns faster than oxygen gas. D. Nitrogen gas can react with oil and debris.
A
How does a bolt-on piercing valve differ from a braze-on piercing valve? Question content area bottom Part 1 A. Braze-on piercing valves can create a danger of overheating. B. Braze-on piercing valves should not be removed after problem correction. C. Braze-on piercing valves provide much quicker access to a system. D. Braze-on piercing valves cannot be operated on sealed systems.
A
The higher the schedule number, the: Question content area bottom Part 1 A. Stronger the pipe B. Weaker the type of pipe C. Thicker the diameter of the pipe D. Thinner the diameter of the pipe
A
The higher the schedule number, the: Question content area bottom Part 1 A. Stronger the type of pipe. B. Weaker the type of pipe. C. Thicker the diameter of the pipe. D. Thinner the diameter of the pipe.
A
Unions, ells, and tees are common types of: Question content area bottom Part 1 A. Pipe fittings. Your answer is correct. B. Threading techniques. C. Iron. D. Copper.
A
What do soldering, brazing, and welding all have in common? Question content area bottom Part 1 A. They are methods for combining metal parts using molten metal. B. They require the same temperature. C. They are methods for combining metal parts in which the base metal is melted. D. They require the same type of torch.
A
What is a difference between piping practices for air-conditioning systems and piping practices for commercial refrigeration systems? Question content area bottom Part 1 A. Air conditioning piping is to be kept as straight and simple as possible. B. Underground lines are common in air-conditioning applications. C. Commercial refrigeration systems' evaporator saturation temperatures are higher than in air conditioning. D. Commercial refrigeration systems have fewer components than a typical air-conditioning system.
A
What is the correct procedure for transporting a 55-ft Superscript 3 oxygen cylinder after use? Question content area bottom Part 1 A. Remove the regulator, screw on the safety cap, and chain to a support. B. Clean the regulator, screw on the safety cap, and store upright. C. Remove the regulator, screw on the safety cap, and store upright. D. Clean the regulator, screw on the safety cap, and chain to a support.
A
What is the difference between hard and soft copper? Question content area bottom Part 1 A. Hard copper cannot be mechanically formed and will crush or buckle rather than bend; soft copper is flexible. B. Hard copper has been annealed and can be formed; soft copper is rigid and cannot be formed without cracking or buckling C. Hard copper cannot be formed without water; soft copper can only be formed at extreme temperatures D. Hard copper is flexible; soft copper is weak
A
What is the minimum OSHA recommended shade for safety glasses used while brazing? Question content area bottom Part 1 A. Shade 3 B. Shade 1 C. Shade 8 D. Shade 11
A
When making a brazed copper joint, what part is heated first? Question content area bottom Part 1 A. The pipe B. The tip C. The fitting D. The torch
A
Which combination of alloy and flux would you use to join two copper pipes by brazing? Question content area bottom Part 1 A. Copper-phosphorus alloy with no flux B. Silver-containing alloy with no flux C. Silver-containing alloy with silver brazing flux D. Copper-phosphorous alloy with active flux
A
Which of following statements is true regarding proper clothing for soldering and brazing? Question content area bottom Part 1 A. 100% cotton blue jeans are acceptable pants for working with torches B. 100% cotton slacks are acceptable pants for working with torches C. Short-sleeve shirts are acceptable when coupled with long-sleeve gloves D. Synthetic clothing is acceptable as long as safety procedures are followed
A
Which of the following is a common problem in long-line air-conditioning systems? Question content area bottom Part 1 A. Refrigerant can migrate from the condenser to the evaporator. B. Subcooling of the system must be reduced. C. Reduced refrigerant charge is required. D. System capacity is reduced by up to 50 percent.
A
Which of the following statements is true? Question content area bottom Part 1 A. Larger lines require a larger gas velocity. B. Smaller lines require a larger gas velocity. C. Larger lines create a larger pressure drop. D. Smaller lines create a smaller pressure drop.
A
Which procedure produces the largest amount of UV radiation and requires the highest safety-glass shading? Question content area bottom Part 1 A. Torch cutting over 6-in. Thick B. Torch soldering C. Torch brazing D. Torch cutting under 1-in. thick
A
Which solder would be the best choice for soldering a copper joint on a washing machine, which experiences high levels of vibration during its spin cycle? Question content area bottom Part 1 A. 96% tin / 4% silver B. 95% tin / 5% antimony C. 85% tin / 15% zinc D. 50% tin / 50% lead
A
Which technique is helpful when filling any type of brazed joint? Question content area bottom Part 1 A. Applying pressure to the filler metal when forcing it into the joint B. Heating only the fitting when applying the filler metal C. Heating the pipe by waving the flame side-to-side D. Aiming the flame at the tip of the filler metal
A
Why is it advisable to avoid entering sealed systems? Question content area bottom Part 1 A. They are prone to leaking when entered. B. They are very easily overcharged. C. They are connected to shutoff devices. D. They do not come pre-evacuated.
A
Why must the copper fitting be cleaned before brazing it? Question content area bottom Part 1 A. To remove surface oxides B. To remove interior oxides C. To prohibit bonding D. To loosen debris
A
Compression, flaring, soldering, and brazing are methods used to connect which of the following? Question content area bottom Part 1 A. Soft copper tubing B. Hard copper tubing C. Black iron D. Galvanized pipe
A
A refrigeration system has a capacity of 4 tons, an evaporator temperature of -20°F, and a line size of 5/8". What is the refrigerant velocity in this system? Question content area bottom Part 1 A. 2000 FPM B. 1000 FPM C. 600 FPM D. 800 FPM
B
Before soft copper can be used, it must be: Question content area bottom Part 1 A. Cut into pieces B. Unrolled C. Heated D. Stretched out
B
For an R-134a system, the saturation pressure at 44°F is 39 psig, and the saturation pressure at 42°F is 36.5 psig. What is the maximum pressure drop in this system? Question content area bottom Part 1 A. 2 psig B. 2.5 psig C. 0 psig D. 5 psig
B
For two lines kept at different temperatures, which of the following statements is true? Question content area bottom Part 1 A. The lower temperature line must be smaller. B. The lower temperature line requires a higher gas velocity. C. The lower temperature line requires a lower gas velocity. D. The lower temperature line must be larger.
B
How are soldering and brazing different? Question content area bottom Part 1 A. Soldering is performed at a higher temperature than brazing. B. Soldering is performed at a lower temperature than brazing. C. Soldering is approved for use on refrigerant lines, while brazing is not. D. Soldering is performed with an oxyacetylene torch.
B
Question content area top Part 1 A section of vertical rise in a commercial refrigeration system is 60 feet. How many oil traps should be installed in this line? Question content area bottom Part 1 A. 3 B. 4 C. 2 D. 1
B
Question content area top Part 1 How is the maximum pressure drop for a suction line determined? Question content area bottom Part 1 A. By measuring the pressure of the liquid line at maximum load and subtracting the pressure of the suction line at half-load B. By using a pressure-temperature chart when the saturation temperature has not exceeded a drop of 2°F C. By using an equation that exploits the direct correlation between pipe size and maximum pressure drop D. By measuring the pressure of the flash gas and dividing it by refrigerant temperature
B
Question content area top Part 1 What is the pressure drop due to the weight of refrigerant in a 30-foot tall liquid line containing R-410A refrigerant? Question content area bottom Part 1 A. 0.50 x 30 = 15 psi drop B. 0.43 x 30 = 12.90 psi drop C. 0.53 x 30 = 15.9 psi drop D. 0.47 x 30 = 14.1 psi drop
B
Question content area top Part 1 Which of the following is the purpose of a split-system valve? Question content area bottom Part 1 A. Controlling refrigerant flow to the center of a manifold B. Holding a refrigerant charge during shipping C. Leaving one exit port open at all times D. Checking system pressures in a convenient manner
B
Question content area top Part 1 Which of the following statements comparing air-conditioning and commercial refrigeration systems is true? Question content area bottom Part 1 A. The lines in air-conditioning systems are typically longer than in refrigeration systems. B. The saturation temperature in air-conditioning systems is considerably higher. C. Air-conditioning systems often have multiple components. D. Underground lines are unavoidable in air-conditioning systems.
B
Question content area top Part 1 Which of the following statements is true? Question content area bottom Part 1 A. Pressure drop can be reduced by installing fittings wherever possible. B. Pressure drop can be reduced by installing larger lines. C. Pressure drop can be reduced by installing smaller lines. D. Pressure drop can be reduced by installing curved lines.
B
The final step to join PVC or CPVC is to: Question content area bottom Part 1 A. Prime the pipe. B. Insert the pipe in the fitting. C. Clean the pipe to be joined. D. Apply solvent evenly to the primed pipe.
B
Type M thin wall tubing is not meant to be used on: Question content area bottom Part 1 A. Normal refrigerant B. Pressurized refrigerant C. Water piping D. Air conditioners
B
What is the actual inside diameter of schedule 40, 34-inch black iron pipe? Question content area bottom Part 1 A. 0.237 inches B. 0.824 inches C. 1.276 inches D. 3.163 inches
B
What is the difference between brazing and soldering? Question content area bottom Part 1 A. The room temperature determines whether the process is brazing or soldering. B. The melting temperature of the filler material determines whether the process is brazing or soldering. C. The type of light emitted determines whether the process is brazing or soldering. D. The boiling point of the filler material determines whether the process is brazing or soldering.
B
What is the difference between type M, L, and K copper tubing? Question content area bottom Part 1 A. The length B. The wall thickness C. The way it is annealed D. The composition
B
What materials are used for piping and tubing in heating, air conditioning, and refrigeration systems? Question content area bottom Part 1 A. Cobalt, bronze, gold, iron, and lead B. Copper, iron, steel, aluminum, PVC, and CPVC C. Silver, titanium, tin, and zinc D. Aluminum, copper, iron, magnesium, and potassium
B
When cutting open a soldered joint for testing, a flux leaks into the pipe. What may have happened while preparing the tube to cause this leak? Question content area bottom Part 1 A. The pipe was not cleaned properly. B. Flux was applied too close to the end of the pipe. C. Oil from your hands contacted the pipe. D. An insufficient amount of flux was applied.
B
When working on a small copper pipe, you measure a length of solder and complete the soldering procedure. When you cut the joint open for testing, you notice that not enough solder has filled the joint. What may have happened to cause this? Question content area bottom Part 1 A. The joint and copper pipe was heated for too long. B. The length of solder measured was less than the pipe diameter. C. The length of solder measured was equal to the pipe diameter. D. The length of solder measured was greater than the pipe diameter.
B
Which of the following statements about air-conditioning lines is true? Question content area bottom Part 1 A. A 70-ft refrigerant line is considered "long." B. A 90-ft refrigerant line is considered "long." C. A 75-ft refrigerant line with a vertical rise of 15 ft is considered "long." D. A 70-ft refrigerant line with a vertical rise of 15 ft is considered "long."
B
Why are suction risers sized differently for systems with capacity control than for systems without capacity control? Question content area bottom Part 1 A. The velocity of the refrigerant increases when the system operates at reduced capabilities, so the risers are sized smaller on systems with capacity control to maintain efficiency. B. The velocity of the refrigerant is reduced when the system operates at reduced capacity, so the risers are sized smaller on systems with capacity control to maintain a minimum velocity. C. Multiple sized risers increase the system's capacity and capabilities. D. The amount of oil needed can be adjusted to meet the needs of the system.
B
Why is it important to purge a gauge manifold and any connecting lines? Question content area bottom Part 1 A. To close off refrigerant flow B. To prevent moisture contamination C. To ensure moisture build-up D. To better the flow of refrigerant
B
Why is nitrogen brazing particularly important when working with systems that use HFC refrigerants? Question content area bottom Part 1 A. HFCs cannot come into contact with any other gas or refrigerant in a system, unless it is nitrogen B. HFCs can clean oxides off of the inside of copper lines and into compressor oil and metering devices, causing major system failures C. HFCs must have nitrogen present in order to function properly D. All of the above E. None of the above
B
Why should acetylene cylinders only be operated in an upright position? Question content area bottom Part 1 A. To prevent the absorbent lining material from leaking out B. To prevent acetone from leaking out C. To prevent air from leaking out D. To prevent acetylene from leaking out
B
K, L, and M are examples of: Question content area bottom Part 1 A. PVC pipe. B. Copper tubing. C. Black iron. D. Galvanized pipe.
B
A refrigeration system has a refrigerant velocity of 1000 FPM, an evaporator temperature of 0°F, and a line size of 5/8". What is the capacity of this system? Question content area bottom Part 1 A. 1 ton B. 6 tons C. 2 tons D. 4 tons
C
Before removing hoses from system service valves, how is high-pressure gas purged from the high side hose? Question content area bottom Part 1 A. Front seat both service valves B. By closing both service ports C. Back-seat the discharge service valve, crack open both manifold valves, purge the high side hose with the system running D. By venting the hose to atmosphere
C
For internal piping of some air conditioners and appliances, which type of pipe is commonly used? Question content area bottom Part 1 A. Steel B. Brass C. Aluminum D. Copper
C
How is ACR tubing measured? Question content area bottom Part 1 A. By its inside diameter B. By its outside radius C. By its outside diameter D. By its inside radius
C
How is copper annealed? Question content area bottom Part 1 A. In factories and in the field, it is heated until it boils B. In factories, it is heated until red; in the field, it is heated until boiling C. In factories, it is heated to 1300° in ovens; in the field, it is heated until red with a torch D. In factories, it is heated to room temperature; in the field, it is heated with a torch
C
List the three types of torches used for soldering and brazing. Question content area bottom Part 1 A. Draft fuel, coil tip, oxy-acetylene B. Air fuel, roil tip air fuel, gas C. Air fuel, swirl tip air fuel, oxy-acetylene D. Gas fuel, swirl tip air fuel, acetylene
C
Question content area top Part 1 What is considered a long line application for residential air conditioning? Question content area bottom Part 1 A. Lines exceeding 200 feet in length or with a vertical rise of more than 40 feet B. Lines exceeding 60 feet in length or with a vertical rise of more than 10 feet C. Lines exceeding 80 feet in length or with a vertical rise of more than 20 feet D. Lines exceeding 100 feet in length or with a vertical rise of more than 25 feet
C
Question content area top Part 1 Why should one be careful when purging a gauge manifold? Question content area bottom Part 1 A. Purging too quickly will release too much coolant. B. Purging too quickly will put damage hoses. C. Purged gases can cause frost bite D. Purged gases can damage service valves.
C
To find the nominal tubing: Question content area bottom Part 1 A. Measure the inside diameter and subtract 5/8 in. B. Measure the inside diameter and subtract 1/8 in. C. Measure the outside diameter and subtract 1/8 in. D. Measure the outside diameter and subtract 5/8 in.
C
What is the difference between schedule 40 and schedule 80 iron pipe? Question content area bottom Part 1 A. Schedule 80 is "standard" strength; schedule 40 is "extra-strong" B. Schedule 80 is more abundant, while schedule 40 is lightweight C. Schedule 80 has a heavier wall than schedule 40. D. Schedule 80 is basic; schedule 40 is durable
C
What is the main benefit of nitrogen brazing, as opposed to standard brazing? Question content area bottom Part 1 A. Nitrogen brazing reduces the risk of accidental explosion. B. Nitrogen brazing is safer than standard brazing. C. Nitrogen brazing reduces oxidation while brazing. D. Nitrogen brazing reduces the pressure in the system.
C
What is the most common range for minimum velocities in a horizontal line carrying refrigerant vapor? Question content area bottom Part 1 A. 1,500 - 2,010 feet per minute B. 200 - 400 feet per minute C. 500 - 750 feet per minute D. 1,000 - 1,500 feet per minute
C
What is the purpose of cracking the gauge manifold valves? Question content area bottom Part 1 A. To limit the flow of refrigerant B. To begin a full system evacuation C. To connect the valve to the center hose Your answer is correct. D. To reverse a system evacuation
C
What materials are used for drain lines? Question content area bottom Part 1 A. Usually zinc, occasionally copper B. Usually CPVC, occasionally lead C. Usually PVC, occasionally copper or CPVC D. Usually aluminum, occasionally iron and lead
C
What two factors influence the temperature at which the different torches operate? Question content area bottom Part 1 A. Cost and fuel type B. Tip size and fuel type C. Oxygen source and fuel type D. Cylinder size and fuel type
C
When gauge manifold valves are closed, they are in the _____ position. Question content area bottom Part 1 A. Side seated B. Back seated C. Front-seated D. Reverse seated
C
Which brazing technique is used to minimize oxidation of the metal? Question content area bottom Part 1 A. Using a phosphorous-containing alloy B. Reducing the temperature of the flame C. Constantly moving the flame between the pipe and the fitting D. Heating the pipe before heating the fitting
C
Which of the following occurs when one loosens the hoses on a gauge manifold? Question content area bottom Part 1 A. Systems leaks become easier to detect. B. The entire system will purge but over a longer period of time. C. The manifold and middle line will remain unpurged. D. All air and contaminants will collect in the middle line.
C
Which of the following statements is accurate? Question content area bottom Part 1 A. All torch types burn fuel at the same rate. B. All torch types can achieve the same temperatures. C. All torch types combine fuel and oxygen to create a flame. Your answer is correct. D. All torch types use separate cylinders for oxygen and fuel.
C
Which of the following statements is true? Question content area bottom Part 1 A. Quick line selection tables should not be used for refrigeration systems. B. Quick line selection tables can be used for any system. C. Quick line selection tables make assumptions about the refrigerant in a system. D. Quick line selection tables make assumptions about the capacity of a system.
C
Which of the following types of tubing is used extensively in commercial refrigeration and air conditioning systems? Question content area bottom Part 1 A. Galvanized pipe B. Steel C. Hard copper D. Soft copper
C
Why are positive-shutoff hoses used on Schrader valves? Question content area bottom Part 1 A. To eliminate the need for using an adapter B. To increase the flow of refrigerant during a gauge failure C. To limit the escape of refrigerant when gauges are disconnected D. To eliminate the need to manually shut off refrigerant flow
C
Why is it beneficial to shut off a system before attempting to install a gauge manifold on a Schrader valve? Question content area bottom Part 1 A. To continue refrigerant flow through the system B. To ensure that the valve stays in its position C. To reduce the risk of escaped refrigerant D. To increase the amount of refrigerant released
C
Why is it important to not overtighten a split-service installation valve? Question content area bottom Part 1 A. These valves are more difficult to loosen than other valves. B. This disrupts the flow of refrigerant through the system. C. The lock ring will pop out and the plug will fly out releasing refrigerant. D. It will be impossible to purge the system later on.
C
Why should the valve on an acetylene cylinder be opened no more than 2-½ turns? Question content area bottom Part 1 A. Because of insurance guidelines B. They are not made to open any further C. It is against federal regulations D. None of the above
C
Why would one open both valves on a manifold gauge? Question content area bottom Part 1 A. To decrease refrigerant flow to the center B. To open either the high or low side port C. To evacuate all refrigerant from the system D. To seal flow from either in or out of the gauge
C
According to OSHA regulations, what is the highest safe operating pressure for an acetylene cylinder? Question content area bottom Part 1 A. 50 psi B. 14 psi C. 20 psi D. 15 psi
D
Copper street ells have: Question content area bottom Part 1 A. Two fitting ends B. Two solder ends. C. Three fitting ends and two solder ends. D. One solder end and one fitting end.
D
How are pipes named? Question content area bottom Part 1 A. By radius and schedule B. By diameter and length C. By radius and length D. By diameter and schedule
D
How can nitrogen gas pose a potential safety hazard? Question content area bottom Part 1 A. Nitrogen gas burns faster than oxygen gas. B. Nitrogen gas can react with oil and debris. C. Nitrogen gas creates harmful metal oxides. D. Nitrogen gas does not irritate the lungs or eyes.
D
How do Schrader valves limit the flow of refrigerant? Question content area bottom Part 1 A. Through a non-leak proof cap B. Through the use of two open outlets C. Through a thickened inner coating D. Through a core taking up most of the valve's center
D
How does nitrogen purging prevent the formation of oxides? Question content area bottom Part 1 A. Oxides cannot form without nitrogen B. Oxides cannot form if nitrogen is present C. Nitrogen cleans the oxides out D. Nitrogen replaces the air (oxygen) and prevents oxide formation
D
Most iron and steel piping used in air conditioning is joined by: Question content area bottom Part 1 A. Heating up the iron and brazing them together. B. Cutting threads on the middle of the pipe and joining the pipe with threaded fittings. C. Heating up the iron and soldering them together. D. Cutting threads on the end of the pipe and joining the pipe with threaded fittings.
D
Question content area top Part 1 An engineer wishes to select a suction line that will have a maximum pressure drop which is equivalent to a 2°F saturation temperature drop. What would be the pressure drop for a 134a system operating with a 0°F saturation temperature? Question content area bottom Part 1 A. 134a at 0°F saturation is 8 psig. 134a at -2°F saturation is 4 psig. 8 - 4 = 4 psi drop for a 2°F saturation temperature drop. B. 134a at 0°F saturation is 3.5 psig. 134a at -2°F saturation is 2.5 psig. 3.5 - 2.5 = 1 psi drop for a 2°F saturation temperature drop. C. 134a at 0°F saturation is 13.5 psig. 134a at -2°F saturation is 9.5 psig. 13.5 - 9.5 = 4 psi drop for a 2°F saturation temperature drop. D. 134a at 0°F saturation is 6.5 psig. 134a at -2°F saturation is 5.5 psig. 6.5 - 5.5 = 1 psi drop for a 2°F saturation temperature drop.
D
Question content area top Part 1 How do split-system installation valves differ from other valves? Question content area bottom Part 1 A. No valves close in the front-seated position. B. These valves only have a single port. C. The valves are not designed to be leak proof. D. The Schrader valve service port is always open.
D
Question content area top Part 1 Which of the following statements is true? Question content area bottom Part 1 A. Subcooling can increase the vertical lift in a line. B. Subcooling can increase the pressure drop in a line. C. Subcooling can increase flash gas in a line. D. Subcooling can decrease flash gas in a line.
D
Question content area top Part 1 Why would a technician open the gauge manifold valves after they are connected to the system's Schrader valves? Question content area bottom Part 1 A. To speed system flow B. To open up the central port C. To build system concentration D. To purge connecting lines
D
Street ells have: Question content area bottom Part 1 A. Two fitting ends. B. Two solder ends. C. Three fitting ends and two solder ends. D. One solder end and one fitting end.
D
The final step to join PVC or CPVC is to: Question content area bottom Part 1 A. Prime the pipe. B. Clean the pipe to be joined. C. Apply solvent evenly to the primed pipe. D. Insert the pipe in the fitting.
D
What is the main benefit of nitrogen brazing, as opposed to standard brazing? Question content area bottom Part 1 A. Nitrogen brazing reduces the risk of accidental explosion. B. Nitrogen brazing reduces the pressure in the system. C. Nitrogen brazing is safer than standard brazing. D. Nitrogen brazing reduces oxidation while brazing.
D
What is the most common range for minimum velocities in a riser carrying refrigerant vapor? Question content area bottom Part 1 A. 1,200 - 1,800 feet per minute B. 500 - 1, 000 feet per minute C. 400 - 800 feet per minute D. 1,000 - 1,500 feet per minute
D
Which method and torch type would you use to make a refrigerant line joint? Question content area bottom Part 1 A. Soldering with an air-fuel swirl-tip torch B. Soldering with an air-fuel torch C. Brazing with an air-fuel torch D. Brazing with an oxyacetylene torch
D
Which of the following can be used to cut PVC pipe? Question content area bottom Part 1 A. Large-tooth saw or plastic shear B. Fine tooth saw only C. Steel shear only D. Fine-tooth saw or plastic shear
D
Which of the following component is more common to commercial refrigeration systems? Question content area bottom Part 1 A. Evaporators B. Vertical lines C. Compressor hard-start kits D. Oil traps
D
Which of the following is a system modification that needs to be made for a long line residential air conditioning application? Question content area bottom Part 1 A. Installing an oil trap to the line B. Adding an inverted P trap to the line C. Using a 12-inch liquid line D. Using a hard shutoff thermal expansion valve at the evaporator
D
Which of the following is the first step to cut a pipe to length? Question content area bottom Part 1 A. Cut the pipe to the desired length using the pipe cutter B. Insert the correct die in the ratchet handle C. Use the pipe reamer to remove the burr left by the pipe cutter D. Mount the pipe in a pipe vice
D
Which of the following materials is often used for refrigeration lines on household refrigerators? Question content area bottom Part 1 A. Brass B. Silver C. Gold D. Copper
D
Which term correctly describes the female ends of copper tubing? Question content area bottom Part 1 A. Coupling B. Joining C. Fitting ends D. Solder ends
D
Why are pipe threads tapered? Question content area bottom Part 1 A. The taper allows the pipe to turn in the connection. B. The taper reconstructs the pipe to fit in any application. C. The tapered pipe threads are required according to state and local codes. D. The taper allows pipe threads to tighten and seal.
D
Why is it important to keep oxygen tanks free of oil and debris? Question content area bottom Part 1 A. Dirty cylinders cannot be securely fastened during transport. B. Dirty cylinders can be dropped while handling. C. Applying regulators is difficult when the cylinder is dirty. D. Pure oxygen will react with any carbon-containing substance.
D
Why must proper protective clothing be worn during welding? Question content area bottom Part 1 A. Because of federal regulations B. Because uniforms are required when welding C. Because of insurance guidelines D. Because of the large quantity of hot sparks produced
D
