CDC 3E151P: Trivia Quiz On Heating, Ventilation And Refrigeration!

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  • 1/124 Questions

    Refrigerants containing chlorine are said to destroy

    • Ozone
    • Carbon
    • Oxygen
    • Nitrogen
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About This Quiz

Welcome to the CDC 3e151p trivia Quiz on heating, ventilation, and Refrigeration. This course teaches you how to store food and maintain heat in different situations, considering one would not know where they are posted or would end up. Take it up and get to see what your chances of survival are even batting camp. All the best in the exams!

CDC 3E151P: Trivia Quiz On Heating, Ventilation And Refrigeration! - Quiz

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  • 2. 

    Which major component is considered to be the “heart” of the refrigeration system?

    • Metering device

    • Compressor

    • Evaporator

    • Condenser

    Correct Answer
    A. Compressor
    Explanation
    The compressor is considered to be the "heart" of the refrigeration system because it plays a crucial role in the refrigeration cycle. It is responsible for compressing the refrigerant gas, which increases its temperature and pressure. This high-pressure gas then flows to the condenser where it releases heat and condenses into a high-pressure liquid. The compressor also helps to circulate the refrigerant throughout the system, ensuring efficient cooling. Without the compressor, the refrigeration system would not be able to function properly.

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  • 3. 

    Complete vaporization in an evaporator occurs at point

    • C

    • G

    • S

    • V

    Correct Answer
    A. V
  • 4. 

    You are retrofitting a system that does not have a receiver. To do the job properly, you would store the refrigerant in

    • A recovery cylinder

    • The compressor

    • The condenser

    • The evaporator

    Correct Answer
    A. A recovery cylinder
    Explanation
    When retrofitting a system that does not have a receiver, it is important to store the refrigerant in a recovery cylinder. This is because a recovery cylinder is designed specifically for storing refrigerants safely and securely. It allows for proper containment and disposal of the refrigerant during the retrofitting process. Storing the refrigerant in the compressor, condenser, or evaporator would not be appropriate or safe in this situation.

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  • 5. 

    What must you do to the power before you perform a preoperational check on a HVAC/R system?

    • Turn off and confirm with a meter

    • Lock the building if possible

    • Properly tag the capacitors

    • Remove the circuit breakers

    Correct Answer
    A. Turn off and confirm with a meter
    Explanation
    Before performing a preoperational check on a HVAC/R system, it is necessary to turn off the power and confirm it with a meter. This ensures the safety of the person performing the check as well as prevents any damage to the system. By turning off the power, the risk of electric shock or injury is minimized. Confirming with a meter helps to ensure that the power is indeed turned off and there is no residual electrical current flowing through the system.

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  • 6. 

    The best critera to follow when you are inspecting equipment are

    • Shop policies

    • Your intuition

    • Your supervisor's instructions

    • The manufacturer's recommendations

    Correct Answer
    A. The manufacturer's recommendations
    Explanation
    When inspecting equipment, it is best to follow the manufacturer's recommendations. This is because the manufacturer knows the equipment best and can provide specific instructions on how to properly inspect and maintain it. Following these recommendations ensures that the equipment is inspected correctly, minimizing the risk of damage or malfunction. Additionally, adhering to the manufacturer's recommendations may be necessary to maintain any warranties or guarantees on the equipment.

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  • 7. 

    Two different metals that are bonded into a strip or coil are called

    • Bimetal

    • Joined metal.

    • Metal bonded

    • Integrated metals.

    Correct Answer
    A. Bimetal
    Explanation
    Bimetal refers to two different metals that are bonded into a strip or coil. This term is commonly used in the field of engineering and construction, where the combination of two metals with different properties can provide unique advantages. The bonding of these metals allows for the creation of materials that have enhanced strength, durability, and resistance to corrosion or temperature changes. Bimetal is a widely used term in various industries, including automotive, aerospace, and electrical.

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  • 8. 

    The advantage of an air-cooled condenser is

    • Greater operating cost

    • Higher head pressure

    • Fans that can become noisy

    • Less maintenance

    Correct Answer
    A. Less maintenance
    Explanation
    An air-cooled condenser has the advantage of requiring less maintenance compared to other types of condensers. This is because it does not use water or other fluids for cooling, eliminating the need for regular maintenance and potential issues such as leaks or corrosion. The absence of fluid also reduces the risk of contamination and the need for monitoring and treating the fluid. Overall, this results in lower maintenance costs and less time spent on upkeep, making air-cooled condensers a more convenient and cost-effective option.

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  • 9. 

    Which evaporator operating condition uses air circulation to aid in defrosting?

    • Frosting.

    • Defrosting.

    • Nonfrosting.

    • Partial frosting.

    Correct Answer
    A. Defrosting.
    Explanation
    Defrosting is the correct answer because it involves the use of air circulation to aid in removing frost or ice buildup on the evaporator. This process helps to melt the frost or ice faster and more efficiently, allowing the evaporator to resume its normal cooling function.

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  • 10. 

    Where are the coldest rooms located in a permanent cold-storage plant?

    • Inside

    • Outside

    • At one end

    • At one side

    Correct Answer
    A. Inside
    Explanation
    The coldest rooms in a permanent cold-storage plant are located inside the plant. This is because the purpose of a cold-storage plant is to maintain low temperatures for the storage of perishable items. By keeping the coldest rooms inside the plant, it allows for better insulation and control of temperature, ensuring that the desired cold conditions are maintained.

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  • 11. 

    What program is designed to keep HVAC/R equipment in operational condition?

    • Operational check program

    • Preoperational check program

    • Recurring maintenance program

    • Real property installed equipment program

    Correct Answer
    A. Recurring maintenance program
    Explanation
    A recurring maintenance program is designed to keep HVAC/R equipment in operational condition. This program involves regularly scheduled inspections, cleaning, and servicing of the equipment to ensure its optimal performance and prevent any potential breakdowns or malfunctions. By implementing a recurring maintenance program, HVAC/R equipment can be kept in good working order, prolonging its lifespan and reducing the likelihood of costly repairs or replacements.

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  • 12. 

    All moving parts on an air compressor should have

    • Pickets

    • Guards

    • V-belts installed

    • Direct-drive motors

    Correct Answer
    A. Guards
    Explanation
    Guards should be installed on all moving parts of an air compressor to ensure safety. These guards serve as protective barriers that prevent accidental contact with the moving parts, reducing the risk of injury. By having guards in place, any potential hazards or accidents that could occur from coming into contact with the moving parts are minimized. Therefore, it is essential to have guards installed on all moving parts of an air compressor.

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  • 13. 

    The disadvantage of water-cooled condensers is

    • Lower head pressure

    • High heat transfer.

    • Compactness

    • Higher cost

    Correct Answer
    A. Higher cost
    Explanation
    Water-cooled condensers have the disadvantage of higher cost compared to other types of condensers. This is because water-cooled condensers require additional equipment such as water pumps, cooling towers, and water treatment systems, which can increase the overall cost of the system. Additionally, the installation and maintenance of water-cooled condensers can also be more expensive compared to other types of condensers. Therefore, the higher cost is a drawback of water-cooled condensers.

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  • 14. 

    A good refrigerant oil will have

    • A high pour point

    • Thermal instability

    • Chemical reaction.

    • Low viscosity.

    Correct Answer
    A. Low viscosity.
    Explanation
    A good refrigerant oil should have low viscosity because it needs to flow easily through the refrigeration system to ensure efficient heat transfer and lubrication. If the oil has high viscosity, it may cause resistance to flow, leading to reduced cooling capacity and increased energy consumption. Additionally, low viscosity helps the oil to circulate effectively and reach all the necessary components in the system, ensuring proper lubrication and preventing wear and tear. Therefore, low viscosity is an important characteristic for a good refrigerant oil.

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  • 15. 

    How does the rotary compressor compress the refrigerated vapor?

    • Rotating action

    • Squeezing action

    • Increasing the volume

    • Decreasing the pressure

    Correct Answer
    A. Squeezing action
    Explanation
    The rotary compressor compresses the refrigerated vapor through a squeezing action. As the rotary blades rotate, they create a tight seal with the compressor housing, trapping the vapor inside. As the blades continue to rotate, the vapor is squeezed and compressed, resulting in an increase in pressure. This squeezing action allows the compressor to effectively compress the vapor and move it through the refrigeration system.

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  • 16. 

    What type of rotary compressor has the blade set into the cylinder?

    • Multiblade

    • Movable blade

    • Stationary blade

    • Eccentric roller blade

    Correct Answer
    A. Stationary blade
    Explanation
    A rotary compressor with a stationary blade has the blade set into the cylinder. This means that the blade is fixed in position and does not move during operation. This type of compressor design allows for efficient compression of gases or fluids as they pass through the cylinder. The stationary blade creates a seal that helps to prevent leakage and ensures that the compression process is effective.

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  • 17. 

    The direct-expansion evaporator picks up or absorbs heat directly from the

    • Outside air

    • Conditioned space

    • Primary refrigerant

    • Secondary refrigerant

    Correct Answer
    A. Conditioned space
    Explanation
    The direct-expansion evaporator is responsible for picking up or absorbing heat directly from the conditioned space. This means that it extracts heat from the air in the area being cooled and transfers it to the refrigerant. This process allows the evaporator to cool down the conditioned space by removing the heat from it.

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  • 18. 

    Which refrigerant oil is designed for use with the new ternary blend refrigerants?

    • Ester

    • Mineral

    • Polyalkylene glycol

    • Alkyl benzene oil

    Correct Answer
    A. Alkyl benzene oil
    Explanation
    Alkyl benzene oil is designed for use with the new ternary blend refrigerants. This type of refrigerant oil is compatible with these specific blend refrigerants and is formulated to provide optimal performance and efficiency in refrigeration systems that use them.

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  • 19. 

    Cleaning a refrigerant at the job site or at a local service shop is called

    • Recycling.

    • Reclamation.

    • Redeeming.

    • Recovery.

    Correct Answer
    A. Recycling.
    Explanation
    The process of cleaning a refrigerant either at the job site or at a local service shop is referred to as recycling. This involves removing any impurities or contaminants from the refrigerant so that it can be reused. Recycling helps to minimize waste and promotes the sustainable use of resources. Reclamation refers to the process of restoring a refrigerant to its original state, while redeeming and recovery are not relevant to the context of cleaning a refrigerant.

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  • 20. 

    What term refers to how hot or cold a substance is?

    • Temoerature

    • Pressure

    • Enthalpy

    • Entropy

    Correct Answer
    A. Temoerature
    Explanation
    Temperature refers to how hot or cold a substance is. It is a measure of the average kinetic energy of the particles in a substance. When the particles have higher kinetic energy, the substance is hotter, and when the particles have lower kinetic energy, the substance is colder. Temperature is measured using various scales such as Celsius, Fahrenheit, and Kelvin. It is an important property in thermodynamics and plays a crucial role in determining the behavior and properties of substances.

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  • 21. 

    Which heat pump component prevents liquid refrigerant from entering the compressor?

    • Drier

    • Receiver

    • Accumulator

    • Oil separator

    Correct Answer
    A. Accumulator
    Explanation
    The accumulator is the heat pump component that prevents liquid refrigerant from entering the compressor. It is located between the evaporator and the compressor and acts as a storage tank for any liquid refrigerant that may have escaped from the evaporator. The accumulator allows the refrigerant to vaporize before entering the compressor, preventing any potential damage that could be caused by liquid refrigerant entering the compressor.

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  • 22. 

    Which of these refrigerants has an ozone depletion rating of zero?

    • R-12

    • R-22

    • R-134a

    • R-500

    Correct Answer
    A. R-134a
    Explanation
    R-134a is the correct answer because it has an ozone depletion rating of zero. This means that it does not contribute to the depletion of the ozone layer. R-12 and R-22, on the other hand, have ozone depletion potentials and can contribute to ozone depletion. R-500 is a blend of refrigerants and does not have a zero ozone depletion rating.

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  • 23. 

    An ice-cream cabinet is similar to a

    • Chest-type freezer

    • Single-door refrigerator

    • Side-by-side refrigerator

    • Bottom-freezer combination

    Correct Answer
    A. Chest-type freezer
    Explanation
    An ice-cream cabinet is similar to a chest-type freezer because both have a similar design and purpose. A chest-type freezer typically has a top-opening door and a deep storage space, allowing for efficient storage and organization of frozen items. Similarly, an ice-cream cabinet is designed to store and display ice cream products, usually with a top-opening door and ample space for storing multiple flavors. Both the chest-type freezer and ice-cream cabinet are commonly used in commercial settings such as grocery stores or ice cream parlors to keep frozen items at the desired temperature.

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  • 24. 

    How much of the refrigerant charge should a receiver hold?

    • One-fourth.

    • One-half.

    • Three-fourths.

    • The entire amount.

    Correct Answer
    A. The entire amount.
    Explanation
    The receiver in a refrigeration system is designed to hold the entire amount of refrigerant charge. It acts as a storage tank for the refrigerant, ensuring that there is a sufficient amount available for the system to operate efficiently. By holding the entire charge, the receiver helps to maintain the proper amount of refrigerant in the system and prevent any fluctuations or shortages that could affect its performance.

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  • 25. 

    What device is used to prevent liquid refrigerant from entering the compressor?

    • Receiver

    • Filter-drier.

    • Accumulator.

    • Oil separator.

    Correct Answer
    A. Accumulator.
    Explanation
    The accumulator is a device used to prevent liquid refrigerant from entering the compressor. It is located between the evaporator and the compressor in a refrigeration system. Its purpose is to collect any liquid refrigerant that may have not evaporated in the evaporator and prevent it from reaching the compressor. This is important because liquid refrigerant entering the compressor can cause damage to the compressor and affect the overall performance of the system.

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  • 26. 

    Which packaged unit normally uses only one fan motor?

    • Heat pump

    • Window unit

    • Floor-mounted

    • Central self-contained

    Correct Answer
    A. Window unit
    Explanation
    A window unit is a type of packaged unit that typically uses only one fan motor. This type of unit is designed to be installed in a window or a hole in a wall, and it contains all the necessary components for cooling or heating a single room. The single fan motor is responsible for both the circulation of air within the unit and the expulsion of hot air to the outside. This design allows for a compact and efficient cooling or heating solution for small spaces.

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  • 27. 

    What is a big problem with humidity control equipment?

    • Shell

    • Scale

    • Glaze

    • Crust

    Correct Answer
    A. Scale
    Explanation
    Scale is a big problem with humidity control equipment. Scale refers to the buildup of mineral deposits, such as calcium and magnesium, on the surfaces of the equipment. This can occur when water with high mineral content is used in the equipment. Scale can reduce the efficiency of the equipment, restrict water flow, and potentially cause damage to the equipment over time. Regular maintenance and cleaning are necessary to prevent and remove scale buildup in humidity control equipment.

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  • 28. 

    Which processes take place inside the condenser?

    • Desuperheating and compression

    • Desuperheating and condensing

    • Vaporization and desuperheating

    • Vaporization and condensing

    Correct Answer
    A. Desuperheating and condensing
    Explanation
    Inside the condenser, two processes take place: desuperheating and condensing. Desuperheating refers to the process of removing excess heat from the superheated vapor, reducing its temperature to the saturation point. Condensing, on the other hand, involves the transformation of the vapor into a liquid state by removing heat, resulting in the release of latent heat. These processes are essential in the condenser as they help in the transfer of heat from the vapor to the cooling medium, allowing the vapor to be converted back into a liquid state.

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  • 29. 

    Which component is installed at the inlet of the evaporator?

    • Metering device

    • Accumulator

    • Compressor

    • Condenser

    Correct Answer
    A. Metering device
    Explanation
    The metering device is installed at the inlet of the evaporator. This component is responsible for regulating the flow of refrigerant into the evaporator, ensuring that the correct amount of refrigerant enters the evaporator coil. It controls the pressure and flow rate of the refrigerant, allowing it to expand and cool down as it passes through the evaporator. By controlling the flow of refrigerant, the metering device helps to maintain the desired temperature and pressure levels within the evaporator, ensuring efficient and effective cooling.

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  • 30. 

    To create the required pressure drop, the capillary tube uses a designed

    • Reactance

    • Resistance

    • Flow increase

    • Pressure increase

    Correct Answer
    A. Resistance
    Explanation
    The capillary tube uses resistance to create the required pressure drop. Resistance refers to the obstruction or hindrance to the flow of fluid through a tube or pipe. In this case, the capillary tube is designed in a way that it offers a certain level of resistance to the flow of fluid, causing a pressure drop. This pressure drop is necessary for various applications such as controlling the flow rate or regulating the pressure within a system.

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  • 31. 

    Which refrigeration compressor is equipped with pistons and connecting rods?

    • Screw

    • Scroll

    • Centrifugal

    • Reciprocating

    Correct Answer
    A. Reciprocating
    Explanation
    A reciprocating refrigeration compressor is equipped with pistons and connecting rods. This type of compressor uses a piston-cylinder arrangement to compress the refrigerant gas. The piston moves back and forth in the cylinder, creating a suction stroke to draw in the refrigerant and a compression stroke to compress the refrigerant. The connecting rod connects the piston to the crankshaft, allowing the reciprocating motion. This type of compressor is commonly used in small to medium-sized refrigeration systems.

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  • 32. 

    The float assembly in an oil separator is activated by the

    • Level of the oil.

    • Low-side pressure.

    • Discharge pressure.

    • High-side pressure.

    Correct Answer
    A. Level of the oil.
    Explanation
    The float assembly in an oil separator is activated by the level of the oil. This means that as the oil level rises, the float assembly will be triggered and activate a mechanism to separate the oil from other substances. The level of the oil is an important factor in determining when and how the oil separator should be activated, as it ensures that the separation process occurs at the appropriate time.

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  • 33. 

    When the compressor air intake is piped to the outside, it should be

    • Three feet above the ground

    • Four feet above the ground

    • Five feet above the ground

    • Six feet above the ground

    Correct Answer
    A. Six feet above the ground
    Explanation
    The compressor air intake should be six feet above the ground when it is piped to the outside. This height ensures that the intake is not obstructed by any potential obstructions on the ground, such as debris or water. By placing the intake higher, the compressor can draw in cleaner and dryer air, which helps to maintain the efficiency and longevity of the equipment.

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  • 34. 

    Which compressor type is used with refrigerants that have a large gas volume?

    • Recipricating

    • Centrifugal

    • Screw

    • Scroll

    Correct Answer
    A. Centrifugal
    Explanation
    Centrifugal compressors are used with refrigerants that have a large gas volume because they are capable of handling high flow rates and can efficiently compress large volumes of gas. These compressors use centrifugal force to accelerate the refrigerant gas and then convert the kinetic energy into pressure energy. This makes them suitable for applications where a large volume of gas needs to be compressed, such as in large-scale industrial refrigeration systems or air conditioning units.

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  • 35. 

    The Environmental Protection Agency (EPA) has developed a Significant New Alternatives Policy (SNAP) Program. This program is used to determine

    • Whether the alternative refrigerant provides adequate performance

    • The risks that alternative refrigerants pose to human health and the environment.

    • Whether the alternative refrigerant is compatible with components of the system.

    • The procedures necessary for retrofitting with refrigerants on the SNAP Program list.

    Correct Answer
    A. The risks that alternative refrigerants pose to human health and the environment.
    Explanation
    The SNAP Program developed by the EPA is used to determine the risks that alternative refrigerants pose to human health and the environment. This suggests that the program focuses on evaluating the potential negative effects of using alternative refrigerants on both human health and the environment. The program likely assesses the potential for these refrigerants to contribute to air pollution, ozone depletion, or climate change, and considers the potential health risks associated with their use.

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  • 36. 

    Which organization requires that a comprehensive risk assessment be performed to estimate the likelihood of fire and potential results should a fire occur when alternative refrigerants contain a flammable component?

    • Air-Conditioning and Refrigeration Institute (ARI).

    • Environmental Protection Agency (EPA).

    • American Society of Testing Materials (ASTM).

    • American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE).

    Correct Answer
    A. Environmental Protection Agency (EPA).
    Explanation
    The correct answer is the Environmental Protection Agency (EPA). The EPA requires a comprehensive risk assessment to be performed to estimate the likelihood of fire and potential results should a fire occur when alternative refrigerants contain a flammable component. This is likely because the EPA is responsible for regulating and protecting the environment, including the safety and potential hazards associated with refrigerants.

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  • 37. 

    You are retrofitting a system with an alternative refrigerant and you determine that the capillary tube must be replaced. To do the job correctly, you would replace the capillary tube with one having

    • Greater resistance and shorter length

    • Lesser resistance and shorter length

    • Greater resistance and longer length

    • Lesser resistance and longer length

    Correct Answer
    A. Greater resistance and longer length
    Explanation
    To retrofit a system with an alternative refrigerant, replacing the capillary tube with one having greater resistance and longer length is the correct approach. This is because the alternative refrigerant may have different flow characteristics compared to the original refrigerant. By increasing the resistance and length of the capillary tube, it helps to regulate and control the flow of the refrigerant, ensuring proper cooling and system performance.

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  • 38. 

    What triggers a refrigeration unit to cycle on or off?

    • Control circuit

    • When plugged in.

    • When it is warm.

    • Load circuit

    Correct Answer
    A. Control circuit
    Explanation
    A refrigeration unit cycles on or off based on the control circuit. The control circuit is responsible for monitoring the temperature and activating the compressor when the temperature rises above a certain threshold. It also turns off the compressor when the temperature reaches the desired level. Therefore, the control circuit is the component that triggers the refrigeration unit to cycle on or off.

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  • 39. 

    What is the term for a refrigeration unit to operate or cycle on?

    • Cut-in

    • Cutout

    • Differential

    • Average temperature

    Correct Answer
    A. Cut-in
    Explanation
    The term for a refrigeration unit to operate or cycle on is "cut-in." This refers to the temperature at which the unit starts running to cool the space. Once the temperature rises above the cut-in point, the refrigeration unit turns on and begins the cooling cycle.

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  • 40. 

    What must be balanced to distribute the load as equally as possible between multiple compressors?

    • Oil separators

    • Condensers

    • Evaporators

    • Refrigerant lines

    Correct Answer
    A. Refrigerant lines
    Explanation
    To distribute the load as equally as possible between multiple compressors, the refrigerant lines must be balanced. Refrigerant lines carry the refrigerant from the evaporator to the condenser and back, and if they are not balanced, it can result in uneven distribution of the workload among the compressors. Balancing the refrigerant lines ensures that each compressor receives an equal amount of refrigerant, leading to more efficient and effective operation of the system.

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  • 41. 

    On a centrifugal machine, the refrigerant flows from the first-stage impeller to the

    • Purge unit

    • Condenser

    • Economizer

    • Second-stage impeller

    Correct Answer
    A. Second-stage impeller
    Explanation
    In a centrifugal machine, the refrigerant flows from the first-stage impeller to the second-stage impeller. The purpose of the impellers is to increase the pressure and velocity of the refrigerant, which allows it to move through the system. The second-stage impeller further increases the pressure and velocity of the refrigerant before it moves on to the next component in the system. This is an important step in the refrigeration process as it helps to maintain the efficiency and effectiveness of the system.

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  • 42. 

    Heat that is picked up in the refrigeration system is rejected at the

    • Condenser

    • Evaporator

    • Compressor

    • Metering devices

    Correct Answer
    A. Condenser
    Explanation
    The heat that is picked up in the refrigeration system is rejected at the condenser. The condenser is responsible for transferring heat from the refrigerant to the surrounding environment, causing the refrigerant to condense back into a liquid state. This process releases the heat that was absorbed from the cooled space, allowing the refrigerant to be ready for another cycle of cooling.

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  • 43. 

    Temperature glide in an zeotropic refrigerant means that the refrigerant is a

    • Blend that acts as one inside the refrigeration system.

    • Mixture that acts as one while inside the refrigeration system.

    • Blend that evaporates and condenses over a range of temperatures instead of a single temperature.

    • Mixture that liquefies and vaporizes over a range of temperatures instead of a single temperature.

    Correct Answer
    A. Blend that evaporates and condenses over a range of temperatures instead of a single temperature.
    Explanation
    Temperature glide in a zeotropic refrigerant refers to the phenomenon where the refrigerant blend evaporates and condenses over a range of temperatures instead of a single temperature. This means that different components of the blend have different boiling and condensing points, causing the blend to behave as a mixture rather than a single substance. As a result, the refrigerant's properties change gradually as it goes through the evaporation and condensation processes, leading to a temperature glide.

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  • 44. 

    What is the maximum fine and jail sentence that service technicians may be subject to for charging a system with an unacceptable refrigerant?

    • $10,000 and 5 years.

    • $10,000 and 10 years.

    • $25,000 and 5 years.

    • $25,000 and 10 years.

    Correct Answer
    A. $25,000 and 5 years.
    Explanation
    Service technicians may be subject to a maximum fine of $25,000 and a jail sentence of up to 5 years for charging a system with an unacceptable refrigerant.

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  • 45. 

    On Type II systems, what level of evacuation in the isolated component must be attained when you are making minor repairs of items such as a filter-drier or a strainer?

    • 0 pounds per square inch gauge (psig).

    • 5 psig.

    • 4 inches of mercury.

    • 10 inches of mercury.

    Correct Answer
    A. 0 pounds per square inch gauge (psig).
    Explanation
    When making minor repairs on Type II systems, such as replacing a filter-drier or a strainer, the level of evacuation required in the isolated component is 0 pounds per square inch gauge (psig). This means that the component should be completely free of any pressure. This is necessary to ensure that no air or moisture is present in the system, which could negatively affect its performance and efficiency. By achieving a vacuum level of 0 psig, any potential contaminants can be effectively removed, allowing for proper functioning of the system after the repairs are made.

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  • 46. 

    Commercial and industrial systems with leaks exceeding what percent per year will require repair?

    • 5

    • 15

    • 25

    • 35

    Correct Answer
    A. 35
    Explanation
    Commercial and industrial systems with leaks exceeding 35% per year will require repair. This means that if the leaks in these systems exceed 35% of the total volume per year, they will need to be fixed. A leak exceeding this percentage indicates a significant problem that needs to be addressed in order to ensure the proper functioning and efficiency of the systems.

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  • 47. 

    R–401A is not a suitable alternative refrigerant for

    • Walk-in coolers.

    • Home refrigerators.

    • Supermarket display cases.

    • Residential air conditioners.

    Correct Answer
    A. Residential air conditioners.
    Explanation
    R-401A is not a suitable alternative refrigerant for residential air conditioners because it is not compatible with the specific requirements and operating conditions of these cooling systems. It may not provide optimal cooling performance or efficiency, and could potentially cause damage or malfunction in the residential air conditioning units. Therefore, it is important to use a refrigerant that is specifically designed and recommended for residential air conditioners to ensure proper functioning and longevity of the equipment.

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  • 48. 

    To help ensure that the proper refrigerant and lubricant will be used in a system in the future, you would

    • Record all baseline data

    • Check the system’s operation

    • Label the components and system.

    • Charge the system with the proper amount and type of refrigerant and oil.

    Correct Answer
    A. Label the components and system.
    Explanation
    Labeling the components and system would help ensure that the proper refrigerant and lubricant will be used in the future. By clearly identifying the components and system, technicians will be able to easily identify the correct refrigerant and lubricant to use, preventing any potential mistakes or errors. This labeling system would provide clear and accurate information for future maintenance and servicing of the system.

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  • 49. 

    Which desiccant is the most popular and can be left in the system indefinitely?

    • Calcium chloride.

    • Aluminum oxide.

    • Calcium oxide.

    • Silica gel

    Correct Answer
    A. Silica gel
    Explanation
    Silica gel is the most popular desiccant that can be left in the system indefinitely. It is commonly used because it has a high adsorption capacity, meaning it can absorb and hold a large amount of moisture. It is also non-toxic and non-reactive, making it safe to use in various applications. Silica gel is often used in packaging to prevent moisture damage to products, and it can be easily regenerated by heating, allowing for its long-term use.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 03, 2012
    Quiz Created by
    Enorab
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