HVAC Quiz: Heating, Ventilation And Air Conditioning! Toughest Trivia Questions

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  • 1/216 Questions

    What is the purpose of air conditioning?

    • To control the humidity in a building
    • To clean the air in a building
    • To control the temperature in a building
    • All of the above
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About This Quiz

This is the toughest HVAC Quiz based on Heating, Ventilation and Air Conditioning. Do you think that you have done adequate revision to tackle it or might you be in need of some practice? If you are not so sure all you need to do is take up this quiz and keep an eye out for others on the topic so as to perfect your understanding. All the best!

HVAC Quiz: Heating, Ventilation And Air Conditioning! Toughest Trivia Questions - Quiz

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  • 2. 

    The three common states of matter are

    • Radiant, conductive, and convective

    • Sensible, latent, and specific

    • Solid, liquid, and gas

    • Sub-atomic, atomic, and molecular 

    Correct Answer
    A. Solid, liquid, and gas
    Explanation
    The three common states of matter are solid, liquid, and gas. These states are based on the arrangement and movement of particles. In a solid, particles are tightly packed and have a fixed shape and volume. In a liquid, particles are close together but can move and flow, taking the shape of the container they are in. In a gas, particles are far apart and move freely, filling the entire space available to them. These three states represent the most common and observable forms of matter in our everyday lives.

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  • 3. 

    Two materials that are considered good thermal conductors are

    • Thermoplastic and rubber

    • Copper and aluminum

    • Glass and ceramic

    • Paper and wood

    Correct Answer
    A. Copper and aluminum
    Explanation
    Copper and aluminum are considered good thermal conductors because they have high thermal conductivity. This means that they can efficiently transfer heat and energy. Copper and aluminum are commonly used in various applications where heat needs to be conducted, such as in electrical wiring, heat sinks, and cooking utensils. Their high thermal conductivity allows for effective heat transfer, making them ideal choices for these purposes.

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  • 4. 

    The chemical components of CFC refrigerants are

    • Chlorine, Freon, and Chromium

    • Chlorine, Fluorine, and Carbon

    • Carbon, Freon, and Chlorine

    • Carbon, Frankincense, and Chlorox

    Correct Answer
    A. Chlorine, Fluorine, and Carbon
    Explanation
    CFC refrigerants are known for their chemical composition of chlorine, fluorine, and carbon. Chlorine is an essential component as it provides stability and prevents the breakdown of the refrigerant. Fluorine enhances the refrigerant's cooling capacity and carbon provides the necessary structure for the compound. The presence of these three elements in CFC refrigerants allows them to function effectively in cooling systems.

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  • 5. 

    The chemical components of HCFC refrigerants are

    • Helium, Carbon, Freon, and Chlorine

    • Helium, Carbon, Frankincense, and Chlorox

    • Hydrogen, Chlorine, Freon, and Chromium

    • Hydrogen, Chlorine, Fluorine, and Carbon

    Correct Answer
    A. Hydrogen, Chlorine, Fluorine, and Carbon
    Explanation
    The correct answer is Hydrogen, Chlorine, Fluorine, and Carbon. HCFC refrigerants are a type of hydrochlorofluorocarbon, which means they contain hydrogen, chlorine, fluorine, and carbon atoms in their chemical structure. These components are essential for the refrigerant to have the desired properties and functions in cooling systems.

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  • 6. 

    What gases are safe to use for refrigerant system pressure testing?

    • Compressed air 

    • Acetylene

    • Oxygen

    • Dry nitrogen

    Correct Answer
    A. Dry nitrogen
    Explanation
    Dry nitrogen is safe to use for refrigerant system pressure testing because it is an inert gas that does not react with other substances or support combustion. It is also non-toxic and non-flammable, making it a suitable choice for pressurizing the system without the risk of explosion or contamination. Additionally, dry nitrogen is readily available and affordable, making it a practical option for this purpose.

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  • 7. 

    What material is used for refrigerant piping heating, air conditioning, and refrigeration system?

    • Galvanized pipe

    • Iron pipe

    • Aluminum tubing

    • Copper tubing

    Correct Answer
    A. Copper tubing
    Explanation
    Copper tubing is commonly used for refrigerant piping in heating, air conditioning, and refrigeration systems. Copper is an ideal material for this purpose due to its excellent heat transfer properties, corrosion resistance, and durability. It allows for efficient and reliable transfer of refrigerant, ensuring optimal performance of the system. Additionally, copper tubing is easy to work with, making installation and maintenance convenient.

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  • 8. 

    Which of the following metering devices can respond to changes in system conditions?

    • Fixed restriction

    • Orifice

    • Thermostatic expansion valve

    • Capillary tube

    Correct Answer
    A. Thermostatic expansion valve
    Explanation
    A thermostatic expansion valve is a metering device that can respond to changes in system conditions. It is designed to regulate the flow of refrigerant into the evaporator coil based on the temperature and pressure conditions in the system. As the system load changes, the thermostatic expansion valve adjusts the flow of refrigerant to maintain optimal performance and efficiency. This makes it a responsive and adaptable metering device compared to fixed restrictions, orifices, and capillary tubes, which have a fixed flow rate and cannot adjust to system changes.

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  • 9. 

    The preferred method of cutting copper tubing for a refrigeration system is with

    • A circular saw

    • A hack saw

    • A tubing cutter

    • A cutting torch

    Correct Answer
    A. A tubing cutter
    Explanation
    A tubing cutter is the preferred method of cutting copper tubing for a refrigeration system because it provides a clean and precise cut. Unlike a circular saw or a hack saw, a tubing cutter is specifically designed for cutting tubing and has a small, sharp cutting wheel that rotates around the tubing, gradually scoring and cutting through it. This method ensures that the tubing remains intact and undamaged, which is important for maintaining the integrity and functionality of the refrigeration system. Using a cutting torch is not recommended as it can generate excessive heat and potentially cause damage to the tubing.

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  • 10. 

    In the United States, the cooling capacity of air conditioning equipment is expressed in?

    • Calories

    • Tons

    • Joules 

    • Therms

    Correct Answer
    A. Tons
    Explanation
    The correct answer is "Tons". In the United States, the cooling capacity of air conditioning equipment is commonly expressed in "Tons". This unit refers to the amount of heat that the air conditioner can remove from a space in one hour. It is based on the cooling effect of one ton of ice melting in 24 hours, which is equivalent to 12,000 BTUs (British Thermal Units) per hour. This measurement allows for a standardized way to compare and specify the cooling capacity of different air conditioning systems.

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  • 11. 

    When should you reqd a product's safety Data Sheet (SDS)?

    • Whenever an OSHA inspector is on the job site

    • After completing the job so you can file all the required safety reports

    • Whenever you accidentally contact the material to find out what treatment is recommended 

    • Before using the material so you are aware of its hazards

    Correct Answer
    A. Before using the material so you are aware of its hazards
    Explanation
    It is important to read a product's Safety Data Sheet (SDS) before using the material so that you are aware of its hazards. The SDS provides detailed information about the potential hazards of the product, including any health effects, precautions for safe handling, and emergency procedures. By reading the SDS beforehand, you can take necessary precautions and ensure your safety while using the material.

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  • 12. 

    What is the purpose of adding fins on the tubing used for heat transfer?

    • Fins protect the coils from dirt.

    • Fins straighten the air flowing over the coils so that it flows more easily.

    • Fins increase heat transfer by increasing the surface area.

    • Fins keep small animals out of the unit by closing the gaps between the coils. 

    Correct Answer
    A. Fins increase heat transfer by increasing the surface area.
    Explanation
    Fins increase heat transfer by increasing the surface area. This is because the additional surface area provided by the fins allows for more contact between the tubing and the surrounding air. As a result, heat can be transferred more efficiently from the tubing to the air. This is particularly important in heat transfer applications, as it helps to enhance the overall efficiency and effectiveness of the system.

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  • 13. 

    Why do some commercial buildings need air conditioning in the winter?

    • Commercial buildings are maintained at lower temperatures to improve productivity.

    • The complexity of control systems for commercial buildings often cause a system to cool a building even when cooling is not needed.

    • Lower temperatures reduce the spread of bacteria.

    • Commercial buildings often have large internal heat loads from people, lights, and machines. 

    Correct Answer
    A. Commercial buildings often have large internal heat loads from people, lights, and machines. 
    Explanation
    Commercial buildings often have large internal heat loads from people, lights, and machines. This means that even in the winter, when the external temperature is lower, the internal temperature can rise due to the heat generated by these factors. In order to maintain a comfortable temperature inside the building, air conditioning may be needed to cool down the space and balance out the heat load.

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  • 14. 

    Contaminants that can be found in recovered refrigerant include

    • Oil and non-condensavles

    • Carbon and particulates

    • Water and acid

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "All of the above" because contaminants that can be found in recovered refrigerant include oil and non-condensables, carbon and particulates, as well as water and acid.

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  • 15. 

    What material is used for air conditioning drain lines?

    • Galvanized iron pipe

    • CPVC

    • Copper

    • PVC

    Correct Answer
    A. PVC
    Explanation
    PVC (Polyvinyl chloride) is commonly used for air conditioning drain lines due to its durability, corrosion resistance, and affordability. PVC pipes are lightweight, easy to install, and can withstand the high moisture levels and temperature fluctuations typically found in air conditioning systems. Additionally, PVC is resistant to chemicals and does not promote the growth of mold or bacteria, making it a suitable choice for drain lines in air conditioning units.

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  • 16. 

    The preferred tool for cutting PVC pipe is

    • A circular saw

    • A hack saw

    • A plastic tubing shear

    • A pocket knife

    Correct Answer
    A. A plastic tubing shear
    Explanation
    A plastic tubing shear is the preferred tool for cutting PVC pipe because it is specifically designed for this purpose. It provides clean and precise cuts, ensuring that the pipe ends are smooth and even. A circular saw can be used, but it may cause rough edges and require additional finishing work. A hack saw can also be used, but it may be more time-consuming and require more effort. A pocket knife is not suitable for cutting PVC pipe as it lacks the necessary strength and precision.

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  • 17. 

    Who developed the first modern air conditioning system?

    • Willis Carrier

    • James Trane

    • Harold Goodman

    • Dave Lennox

    Correct Answer
    A. Willis Carrier
    Explanation
    Willis Carrier is credited with developing the first modern air conditioning system. He invented the system in 1902 and it was designed to control the temperature and humidity of a printing plant. Carrier's invention revolutionized the way buildings are cooled and made it possible to create comfortable indoor environments in hot and humid climates. His pioneering work laid the foundation for the modern air conditioning industry.

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  • 18. 

    The three basic methods of heat transfer are

    • Specific, sensible, and latent

    • Endothermal, exothermal, and isothermal

    • Anterior, inferior, and superior

    • Conduction, convection, and radiation

    Correct Answer
    A. Conduction, convection, and radiation
    Explanation
    The correct answer is conduction, convection, and radiation. These three methods are the fundamental ways in which heat is transferred from one object to another. Conduction refers to the transfer of heat through direct contact between objects or particles. Convection involves the transfer of heat through the movement of fluids, such as air or water. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. These methods play a crucial role in various everyday phenomena, such as cooking, weather patterns, and thermal insulation.

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  • 19. 

    The four major components of the compression refrigeration cycle in order are

    • Condenser, metering device, compressor, evaporator

    • Compressor, condenser, metering device, evaporator

    • Compressor, evaporator, condenser, metering device

    • Metering device, condenser, evaporator, compressor

    Correct Answer
    A. Compressor, condenser, metering device, evaporator
    Explanation
    The correct answer is "Compressor, condenser, metering device, evaporator." This order represents the four major components of the compression refrigeration cycle. The compressor is responsible for compressing the refrigerant, increasing its pressure and temperature. The high-pressure refrigerant then flows into the condenser, where it releases heat and condenses into a liquid. The metering device regulates the flow of the condensed liquid refrigerant into the evaporator. In the evaporator, the refrigerant absorbs heat from the surrounding environment and evaporates, cooling the area.

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  • 20. 

    The three basic types of condensers used with HVAC/R systems are

    • Standard, metric, and transitional

    • Condensing, non-condensing, and static

    • Air cooled, water cooled, and evaporative

    • External, internal, and cross-charged

    Correct Answer
    A. Air cooled, water cooled, and evaporative
    Explanation
    The correct answer is air cooled, water cooled, and evaporative. These are the three basic types of condensers used with HVAC/R systems. Air cooled condensers use air to cool the refrigerant, water cooled condensers use water, and evaporative condensers use a combination of air and water to cool the refrigerant.

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  • 21. 

    Two types of fixed metering devices are

    • Copper and brass

    • Pressure reducing and pressure increasing 

    • Capillary tubes and orifices

    • High pressure and low pressure

    Correct Answer
    A. Capillary tubes and orifices
    Explanation
    The correct answer is capillary tubes and orifices. Capillary tubes and orifices are both types of fixed metering devices used in various applications. Capillary tubes are long, narrow tubes with a small diameter that restrict the flow of fluid, allowing for precise control of flow rates. Orifices, on the other hand, are small openings or holes that also restrict the flow of fluid. Both capillary tubes and orifices are commonly used in systems where precise metering and control of fluid flow is required.

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  • 22. 

    Matter is defined as

    • Anything that has mass and takes up space

    • Physical objects that can be seen

    • Anything that has weight, can be seen, and emits energy

    • Physical objects that emit energy

    Correct Answer
    A. Anything that has mass and takes up space
    Explanation
    The correct answer is "Anything that has mass and takes up space." This definition of matter encompasses all physical objects and substances that exist in the universe. Matter can be solid, liquid, or gas, and it includes everything from tiny particles to massive celestial bodies. The key characteristics of matter are its mass, which is a measure of the amount of material it contains, and its volume, which is the amount of space it occupies. This definition excludes non-physical entities such as energy or abstract concepts.

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  • 23. 

    Refrigerant piping must be able to adequately carry both refrigerant and:

    • Oil

    • Air

    • Electricity

    • Nitrogen

    Correct Answer
    A. Oil
    Explanation
    Refrigerant piping must be able to adequately carry both refrigerant and oil. Oil is an essential component in refrigeration systems as it lubricates the compressor and other moving parts, ensuring smooth operation and preventing wear and tear. The oil circulates along with the refrigerant, helping to maintain proper lubrication throughout the system. Therefore, the refrigerant piping needs to be designed and sized appropriately to accommodate the flow of both refrigerant and oil, ensuring efficient and reliable operation of the refrigeration system.

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  • 24. 

    What temperature scale uses 0o as the freezing point of water and 100o as the boiling point of water?

    • Fahrenheit

    • Kelvin 

    • Rankine

    • Celsius

    Correct Answer
    A. Celsius
    Explanation
    The Celsius temperature scale uses 0o as the freezing point of water and 100o as the boiling point of water. This scale is commonly used in most countries around the world for everyday temperature measurements.

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  • 25. 

    Campers being heated by a fire outside is an example of

    • Radiation

    • Sublimation

    • Convectin

    • Conduction

    Correct Answer
    A. Radiation
    Explanation
    Campers being heated by a fire outside is an example of radiation. Radiation is the transfer of heat energy through electromagnetic waves. In this scenario, the heat energy from the fire is transferred to the campers through radiation. There is no direct contact between the fire and the campers, but the heat energy is able to travel through space and reach the campers, warming them up.

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  • 26. 

    A mechanical refrigeration system cools a room by

    • Adding cold to the room until the level of cold reaches the proper level

    • Removing heat from the room

    • Realigning the air molecules in the room

    • Radiating cold energy into the room

    Correct Answer
    A. Removing heat from the room
    Explanation
    The correct answer is removing heat from the room. A mechanical refrigeration system works by removing heat from the room, thereby lowering the temperature. It does not add cold directly to the room or realign air molecules. Instead, it uses a refrigerant to absorb heat from the room and then releases it outside. This process cools down the room and maintains the desired temperature.

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  • 27. 

    The purpose of the condenser in a refrigeration system is to 

    • Absorb heat into the refrigerant

    • Reject heat from the refrigerant

    • Reject heat from the condensing medium

    • Increase the pressure and temperature of the refrigerant

    Correct Answer
    A. Reject heat from the refrigerant
    Explanation
    The purpose of the condenser in a refrigeration system is to reject heat from the refrigerant. As the refrigerant flows through the condenser, it releases heat to the surrounding environment, causing it to cool down and condense into a liquid state. This heat rejection process is essential for the refrigerant to release the heat it absorbed from the cooled space and maintain its ability to absorb more heat in the evaporator. By rejecting heat, the condenser helps to maintain the cooling cycle and ensure efficient refrigeration.

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  • 28. 

    Which type of ladders are safest to use in any working conditions?

    • Aluminum ladders

    • Any ladder that is structurally sound is safe as long as the power tool is properly gounded

    • Fiberglass ladders

    • All steel folding ladders

    Correct Answer
    A. Fiberglass ladders
    Explanation
    Fiberglass ladders are considered the safest to use in any working conditions because they are non-conductive, lightweight, and durable. Unlike aluminum or steel ladders, fiberglass ladders do not conduct electricity, making them ideal for working near power sources or electrical equipment. Additionally, fiberglass ladders are resistant to weather conditions, chemicals, and corrosion, ensuring their stability and longevity. Therefore, using fiberglass ladders minimizes the risk of electrical accidents and provides a secure and reliable platform for various tasks.

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  • 29. 

    A metal rod is heated on one end and heat travels from that end to the cooler end through the rod. This is an example of

    • Conduction

    • Radiation

    • Convection

    • Sublimation

    Correct Answer
    A. Conduction
    Explanation
    Conduction is the transfer of heat through direct contact between particles of a substance. In this scenario, the metal rod is heated on one end, causing the particles at that end to gain energy and vibrate more rapidly. These vibrating particles then collide with neighboring particles, transferring their energy and heat to them. This process continues along the rod until the heat reaches the cooler end, resulting in the transfer of heat through conduction.

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  • 30. 

    The fins on finned tube coils increase heat transfer by

    • Increasing the laminar air flow through the coil

    • Increasing the surface area exposed to the air

    • Increasing the laminar refrigerant flow through the coil

    • Directing the air smoothly across the coil 

    Correct Answer
    A. Increasing the surface area exposed to the air
    Explanation
    The fins on finned tube coils increase heat transfer by increasing the surface area exposed to the air. The fins provide additional surface area for heat exchange between the coil and the surrounding air, allowing for more efficient heat transfer. This increased surface area allows for a greater amount of heat to be transferred from the coil to the air, resulting in improved heat transfer performance.

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  • 31. 

    What are the chemical components of HFC refrigerant?

    • Helium, Freon, and Chlorine

    • Hydrogen, Freon, and Chromium

    • Hydrogen, Fluorine, and Carbon

    • Helium, Fluorine, and Chlorine 

    Correct Answer
    A. Hydrogen, Fluorine, and Carbon
    Explanation
    The correct answer is Hydrogen, Fluorine, and Carbon. HFC refrigerants, or hydrofluorocarbon refrigerants, are composed of hydrogen, fluorine, and carbon atoms. These refrigerants are commonly used as alternatives to chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) refrigerants due to their lower ozone depletion potential. HFC refrigerants are considered environmentally friendly and are widely used in air conditioning and refrigeration systems.

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  • 32. 

    The first law of thermodynamics states that

    • Energy cannot be created or destroyed

    • The molecular energy band is directly proportional to the thermal activity of the molecule

    • Whenever energy is created, an equal quantity of energy must be destroyed to maintain thermal equilibrium

    • All objects contain some energy

    Correct Answer
    A. Energy cannot be created or destroyed
    Explanation
    The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed. This means that the total amount of energy in a closed system remains constant. Energy can only be converted from one form to another or transferred between objects. This law is based on the principle of conservation of energy, which is a fundamental concept in physics. It implies that energy is a conserved quantity and plays a crucial role in understanding various phenomena and processes in the universe.

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  • 33. 

    New residential air conditioning systems now primarily use

    • CFC-12

    • HCFC-22

    • HFC-134a

    • HFC-410A

    Correct Answer
    A. HFC-410A
    Explanation
    HFC-410A is the correct answer because it is a commonly used refrigerant in new residential air conditioning systems. It is considered a more environmentally friendly option compared to other refrigerants like CFC-12 and HCFC-22, which have been phased out due to their harmful effects on the ozone layer. HFC-410A has a lower impact on global warming potential and does not contribute to ozone depletion, making it a preferred choice for modern air conditioning systems.

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  • 34. 

    What units are used to measure pressure in HVAC/R systems in the United States?

    • Pounds per square inch absolute (psia)

    • Newtons

    • Pounds per square inch gauge (psig)

    • Kilopascals (kPa)

    Correct Answer
    A. Pounds per square inch gauge (psig)
    Explanation
    In HVAC/R systems in the United States, pressure is measured in pounds per square inch gauge (psig). This unit is used to measure the pressure relative to atmospheric pressure. PSIG indicates the pressure above or below atmospheric pressure, making it a suitable unit for HVAC/R systems where pressure differentials are important. Pounds per square inch absolute (psia) measures the pressure relative to a perfect vacuum, Newtons is a unit of force, and kilopascals (kPa) is a metric unit of pressure.

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  • 35. 

    Why are copper fittings cleaned before soldering or brazing?

    • To create enough clearance so that the pipe will fit into the fitting

    • To remove oxides

    • To enhance the aesthetic appearance of the completed joint

    • To make it easier to see the junction between the fitting and the pipe. 

    Correct Answer
    A. To remove oxides
    Explanation
    Copper fittings are cleaned before soldering or brazing to remove oxides. Oxides can form on the surface of the copper due to exposure to air and moisture, and these oxides can interfere with the soldering or brazing process. By removing the oxides, the surface of the copper fitting is prepared for a clean and effective bond with the solder or brazing material. This ensures a strong and reliable joint between the fitting and the pipe.

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  • 36. 

    Explain how a non-toxic, nonflammable refrigerant can be dangerous.

    • Most common refrigerants decompose on contact with air to form toxic substances

    • Most common refrigerants decompose on contact with air to form flammable substances

    • Concentrated refrigerant can cause euphoric highs that lead to irrational and dangerous behavior

    • The refrigerant can replace all the air in a space, depriving you of oxygen

    Correct Answer
    A. The refrigerant can replace all the air in a space, depriving you of oxygen
  • 37. 

    What physical change of state is the opposite of evaporation?

    • Melting

    • Sublimation

    • Freezing

    • Condensation

    Correct Answer
    A. Condensation
    Explanation
    Condensation is the opposite of evaporation because while evaporation is the process of a liquid turning into a gas, condensation is the process of a gas turning into a liquid. When water vapor in the air cools down, it loses energy and transforms into liquid water droplets, which is known as condensation. This process is commonly observed when warm air comes into contact with a cold surface, such as when steam from a shower condenses on a mirror.

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  • 38. 

    A device used to evenly distribute mixtures of liquid and vapor refrigerant leaving the TEV to multiple evaporator circuits is called a

    • Refrigerant distributor 

    • Refrigerant manifold

    • Refrigerant junction

    • Refrigerant header

    Correct Answer
    A. Refrigerant distributor 
    Explanation
    A device used to evenly distribute mixtures of liquid and vapor refrigerant leaving the TEV to multiple evaporator circuits is called a refrigerant distributor.

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  • 39. 

    What is the main purpose of the fins on finned tube evaporators?

    • Fins increase the surface area of the coil

    • Fins direct the condensed water to the drain pan

    • Fins protect the coil from being punctured by projectiles

    • Fins direct the air more smoothly across the coil 

    Correct Answer
    A. Fins increase the surface area of the coil
    Explanation
    The main purpose of the fins on finned tube evaporators is to increase the surface area of the coil. This increased surface area allows for more efficient heat transfer between the refrigerant inside the coil and the air outside. By increasing the surface area, the fins maximize the contact between the coil and the air, allowing for better cooling or heating performance. This is particularly important in evaporators, where the refrigerant absorbs heat from the surrounding air to cool or dehumidify the space.

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  • 40. 

    Besides improving efficiency, insulating the suction line:

    • Serves as a backup sealing system to prevent refrigerant loss

    • Prevent stray electrical current from traveling down the pipe

    • Reduces mechanical vibrations set up by the compressor

    • Prevents moisture from condensing on the line

    Correct Answer
    A. Prevents moisture from condensing on the line
    Explanation
    Insulating the suction line prevents moisture from condensing on the line. When the suction line is not insulated, the temperature difference between the line and the surrounding air can cause moisture in the air to condense on the line. This can lead to the formation of water droplets, which can cause corrosion and damage to the line. By insulating the suction line, the temperature of the line is kept closer to the surrounding air temperature, minimizing the risk of condensation and preventing moisture-related issues.

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  • 41. 

    Which statement accurately describes heat flow between two objects?

    • Heat travels from the object with the higher BTU quantity to the object with the lower BTU quantity.

    • Heat travels from the object with the lower temperature to the object with the higher temperature.

    • Heat travels from the object with the higher temperature to the object with the lower temperature. 

    • Heat travels from the object with the lower BTU quantity to the object with the higher BTU quantity. 

    Correct Answer
    A. Heat travels from the object with the higher temperature to the object with the lower temperature. 
    Explanation
    Heat always flows from an object with a higher temperature to an object with a lower temperature. This is because heat is a form of energy that naturally moves from areas of higher energy (higher temperature) to areas of lower energy (lower temperature) in order to achieve thermal equilibrium.

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  • 42. 

    The difference between a liquid receiver and a suction accumulator is that 

    • Receivers only allow liquid to leave while accumulators only allow vapor to leave

    • An accumulator is located on the low side just before the compressor

    • A liquid receiver is used after the condenser on the high side

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "All of the above". This is because all three statements are true. A liquid receiver only allows liquid to leave, while a suction accumulator only allows vapor to leave. Additionally, an accumulator is located on the low side just before the compressor, and a liquid receiver is used after the condenser on the high side. Therefore, all three statements differentiate between a liquid receiver and a suction accumulator.

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  • 43. 

    The refrigeration system component that absorbs heat out of the product is the 

    • Condenser

    • Compressor

    • Expansion device

    • Evaporator

    Correct Answer
    A. Evaporator
    Explanation
    The evaporator is the correct answer because it is the component in a refrigeration system that absorbs heat from the product or the surrounding environment. It is responsible for cooling down the refrigerant and evaporating it into a gas state, which allows it to absorb heat effectively.

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  • 44. 

    A general definition of refrigerant is

    • A hydrocarbon based chemical with noble elements replacing some of the hydrogen atoms

    • A fluid that is naturally cold

    • The fluid used in a refrigeration system for transferring heat

    • A fluid that can turn heat into mass

    Correct Answer
    A. The fluid used in a refrigeration system for transferring heat
    Explanation
    Refrigerant is a fluid that is used in a refrigeration system for transferring heat. In a refrigeration system, the refrigerant absorbs heat from the surroundings and carries it away, resulting in the cooling of the environment. It undergoes a cycle of evaporation and condensation to transfer heat effectively. The refrigerant plays a crucial role in the refrigeration process by facilitating the transfer of heat from one place to another, allowing for the desired cooling effect.

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  • 45. 

    What is an absolute temperature scale?

    • A temperature scale with no negative temperatures and 0o equal to absolute 0

    • A temperature scale that uses sensitive wireless sensors to detect the vibrational frequency of the molecules in a substance to determine its temperature to a high degree of accuracy

    • A theoretical temperature scale that only applies to quantum physics

    • A thermometer that has been NIST calibrated to be absolutely correct

    Correct Answer
    A. A temperature scale with no negative temperatures and 0o equal to absolute 0
    Explanation
    An absolute temperature scale is a temperature scale that does not have any negative temperatures and where 0 degrees is equal to absolute zero. Absolute zero is the lowest possible temperature, at which all molecular motion stops. This means that on an absolute temperature scale, temperatures can only be positive or zero, and the temperature increases as the value increases.

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  • 46. 

    A compressor that squeezes gas in between the piston and a valve plate at the top of the cylinder is called a 

    • Scroll compressor

    • Rotary compressor

    • Screw compressor

    • Reciprocating compressor

    Correct Answer
    A. Reciprocating compressor
    Explanation
    A reciprocating compressor is a type of compressor that squeezes gas between the piston and a valve plate at the top of the cylinder. This type of compressor uses a piston-cylinder arrangement to compress the gas by reciprocating motion. As the piston moves downwards, it compresses the gas, and as it moves upwards, it creates suction to draw in more gas. The reciprocating compressor is commonly used in applications where high pressure and low flow rates are required.

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  • 47. 

    The purpose of subcooling the liquid refrigerant is to 

    • Increase the system capacity

    • Insure a solid stream of liquid to the metering device

    • Increase system efficiency

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Subcooling the liquid refrigerant serves multiple purposes. Firstly, it increases the system capacity by removing any remaining heat from the refrigerant before it enters the expansion valve. This allows for a greater amount of refrigerant to be vaporized and cooled, thereby increasing the cooling capacity of the system. Secondly, subcooling ensures a solid stream of liquid to the metering device, preventing any vapor bubbles from entering the expansion valve and causing inefficiencies. Lastly, by removing additional heat from the refrigerant, subcooling increases system efficiency by improving the overall heat transfer process.

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  • 48. 

    The heat rejected by the condenser

    • Equals the heat added by the compressor

    • Equals the heat absorbed by the evaporator plus the heat added by the compressor

    • Equals the heat absorbed by the evaporator

    • Has no relationship to either the evaporator or compressor

    Correct Answer
    A. Equals the heat absorbed by the evaporator plus the heat added by the compressor
    Explanation
    The heat rejected by the condenser equals the heat absorbed by the evaporator plus the heat added by the compressor because in a refrigeration cycle, heat is transferred from the evaporator to the condenser. The evaporator absorbs heat from the surroundings, causing the refrigerant to evaporate and cool the space being cooled. The compressor then increases the pressure and temperature of the refrigerant, adding more heat to it. Finally, the condenser rejects the heat to the surroundings, completing the cycle. Therefore, the heat rejected by the condenser is the sum of the heat absorbed by the evaporator and the heat added by the compressor.

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  • 49. 

    Why is a large refrigerant leak potentially dangerous?

    • Most common refrigerants used in residential systems are highly flammable 

    • Most common refrigerants used in residential are highly toxic

    • Most common refrigerants used in residential systems are highly corrosive

    • Asphyxiation can result from refrigerant displacing the air

    Correct Answer
    A. Asphyxiation can result from refrigerant displacing the air
    Explanation
    A large refrigerant leak can be potentially dangerous because it can lead to asphyxiation. When a refrigerant leaks, it can displace the air in the surrounding environment, reducing the oxygen levels. Breathing in an atmosphere with low oxygen levels can lead to suffocation and asphyxiation. Therefore, it is important to address and fix refrigerant leaks promptly to prevent any potential harm or danger.

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Quiz Review Timeline (Updated): Jun 28, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jun 28, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 24, 2019
    Quiz Created by
    Dropgoat1
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