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1/85 Questions

Simultaneous control of the temperature, humidity, motion, and purity of the air in a confined space.
- Air-conditioning
- Air-refrigeration
- Air-controller
- Airism

About This Quiz

Dive into the world of HVAC with this Ultimate HVAC Trivia! Test your knowledge on air-conditioning, refrigerants, and cooling systems. Understand key concepts and their applications, perfect for learners interested in mechanical and environmental engineering.

Take The Ultimate HVAC Trivia Questions! - Quiz

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2.

A substance that produces a refrigerating effect while expanding or vaporizing as it circulates as a gas or liquid through a closed vapor-compression refrigeration system.
- Refrigerant
- Air-cooled water
- Water-cooled water
- Ice
Correct Answer

A. Refrigerant

Explanation

A refrigerant is a substance that produces a refrigerating effect when it expands or vaporizes as it circulates through a closed vapor-compression refrigeration system. It can exist as a gas or liquid and is responsible for absorbing heat from the surrounding environment, cooling it down. The refrigerant then releases this heat elsewhere, allowing the cooling process to continue.

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1
3.

List all common refrigerants:
- HCFC
- HFC
- Freon 12
- Freon 11
- CFC 12
Correct Answer(s)

A. HCFC
A. HFC

Explanation

The correct answer includes HCFC and HFC as common refrigerants. HCFC stands for hydrochlorofluorocarbon, which is a type of refrigerant that contains chlorine, fluorine, carbon, and hydrogen. HFC stands for hydrofluorocarbon, which is another type of refrigerant that only contains hydrogen, fluorine, and carbon. Both HCFC and HFC are commonly used in refrigeration systems and air conditioning units. The other options mentioned, such as Freon 12, Freon 11, and CFC 12, are specific types or brand names of refrigerants that fall under the broader categories of HCFC or CFC.

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4.

List all obsolete refrigerants:
- HCFC
- HFC
- Freon 12
- Freon 11
- CFC 12
Correct Answer(s)

A. Freon 12
A. Freon 11
A. CFC 12

Explanation

The correct answer includes the refrigerants Freon 12, Freon 11, and CFC 12. These refrigerants are considered obsolete because they contain chlorofluorocarbons (CFCs) or hydrochlorofluorocarbons (HCFCs), which are harmful to the ozone layer. Due to their negative environmental impact, these refrigerants have been phased out and replaced with more environmentally friendly alternatives.

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1
5.

Cooling capacity: How many BTU/HR per 1 ton
- 12,000 BTU/hr
- 10,000 BTU/hr
- 8,000 BTU/hr
- 9000 BTU/hr
Correct Answer

A. 12,000 BTU/hr

Explanation

The cooling capacity is measured in BTU/hr per 1 ton. The correct answer is 12,000 BTU/hr, which means that for every 1 ton of cooling capacity, the system is capable of removing 12,000 BTUs of heat per hour.

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1
6.

Network of tubes filled with refrigerant that absorbs heat from air or liquid and moves it outside the refrigerated area by means of a refrigerant.
- Evaporator
- Condenser
- Compressor
- Expansion Valve
Correct Answer

A. Evaporator

Explanation

The evaporator is a network of tubes filled with refrigerant that absorbs heat from the air or liquid. It is responsible for cooling the refrigerated area by removing heat from it. The refrigerant inside the evaporator evaporates as it absorbs heat, thus cooling the surrounding area.

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1
7.

Network of tubes that discharges unwanted heat from the refrigerant to a medium (e.g. air, water, or combination) that absorbs the heat.
- Condenser
- Evaporator
- Compressor
- Expansion Valve
Correct Answer

A. Condenser

Explanation

The correct answer is "Condenser". A condenser is a component in a refrigeration system that is responsible for discharging unwanted heat from the refrigerant. It does this by transferring the heat to a medium such as air, water, or a combination of both, which absorbs the heat. The network of tubes in the condenser facilitates this heat transfer process, allowing the refrigerant to release heat and convert back into a liquid state.

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2
8.

A pump-like equipment that drives (via electric motor) the refrigerant from the evaporator to the condenser and back to the evaporator again.
- Compressor
- Evaporator
- Condenser
- Expansion Valve
Correct Answer

A. Compressor

Explanation

The correct answer is compressor. A compressor is a pump-like equipment that is responsible for driving the refrigerant from the evaporator to the condenser and back to the evaporator again. It does this by using an electric motor to increase the pressure and temperature of the refrigerant, allowing it to flow through the refrigeration cycle and transfer heat effectively. The compressor plays a crucial role in the refrigeration process by maintaining the flow of refrigerant and ensuring efficient cooling.

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9.

Controls liquid refrigerant passing through a very small orifice, which causes the refrigerant to expand to low-pressure/low temperature gas.
- Expansion Valve
- Evaporator
- Condenser
- Compressor
Correct Answer

A. Expansion Valve

Explanation

The expansion valve controls the flow of liquid refrigerant through a small orifice. This restriction causes the refrigerant to expand, resulting in a low-pressure and low-temperature gas. By regulating the flow of refrigerant, the expansion valve helps to maintain the desired temperature and pressure levels in the system.

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10.

Type of condenser used in unit and packaged-type air-conditioners.
- Air-cooled Condenser
- Water-cooled Condenser
- Shell and Tube Heat Exchanger
- Direct Expansion Coils
Correct Answer

A. Air-cooled Condenser

Explanation

Air-cooled condensers are the type of condensers commonly used in unit and packaged-type air-conditioners. These condensers work by transferring heat from the refrigerant to the surrounding air. They consist of a series of fins and tubes, with the refrigerant flowing through the tubes and the air passing over the fins. As the air moves over the fins, it absorbs the heat from the refrigerant, causing the refrigerant to condense and release heat to the surroundings. This process allows for efficient cooling of the refrigerant and helps in maintaining the desired temperature inside the air-conditioning system.

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11.

Type of condenser used in centralized systems.
- Water-cooled Condenser
- Air-cooled Condenser
- Shell and Tube Heat Exchanger
- Direct Expansion Coils
Correct Answer

A. Water-cooled Condenser

Explanation

Water-cooled condensers are the type of condensers used in centralized systems. These condensers work by transferring heat from the refrigerant to the water, which then circulates through a cooling tower or other water source to dissipate the heat. This type of condenser is commonly used in large-scale HVAC systems and industrial processes where a large amount of heat needs to be removed. Water-cooled condensers are efficient and effective at cooling the refrigerant, making them a suitable choice for centralized systems.

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12.

Type of evaporator wherein the refrigerant is expanded into a shell enclosing the tube through which the water flows.
- Shell and Tube Heat Exchanger
- Dire Expansion Coils
- Air-cooled Condenser
- Water-cooled Condenser
Correct Answer

A. Shell and Tube Heat Exchanger

Explanation

A shell and tube heat exchanger is a type of evaporator where the refrigerant is expanded into a shell that encloses the tube through which the water flows. This design allows for efficient heat transfer between the refrigerant and the water, as the refrigerant absorbs heat from the water as it evaporates. The shell and tube configuration provides a large surface area for heat transfer, making it an effective choice for evaporating the refrigerant and cooling the water.

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13.

Type of evaporator wherein the coils containing the refrigerant itself
- Direct Expansion Coils
- Shell and Tube Heat Exchanger
- Air-cooled Condenser
- Water-cooled Condenser
Correct Answer

A. Direct Expansion Coils

Explanation

Direct Expansion Coils is the correct answer because this type of evaporator has coils that contain the refrigerant itself. In this system, the refrigerant directly evaporates and absorbs heat from the surrounding air or water, depending on the application. This type of evaporator is commonly used in air conditioning systems and refrigeration units, where the refrigerant evaporates and cools the air or water that passes over the coils.

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14.

A type of compressor for tonnages up to 100 tons.
- Piston Type / Reciprocating Compressor
- Centrifugal Compressor
- Screw-type Compressor
- Box-type Compressor
Correct Answer

A. Piston Type / Reciprocating Compressor

Explanation

A piston type or reciprocating compressor is the correct answer for this question because it is a type of compressor that is suitable for tonnages up to 100 tons. This type of compressor uses pistons to compress the air or gas, which are driven by a crankshaft. It is commonly used in applications where high pressure and low flow rates are required, such as in industrial processes and refrigeration systems. The other options listed, such as centrifugal, screw-type, and box-type compressors, may have different capabilities and are not specifically designed for tonnages up to 100 tons.

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15.

A type of compressor that are quieter, have fewer vibration problems, require less maintenance and with better operating control.
- Centrifugal Compressors
- Piston Type / Reciprocating Compressor
- Screw-type Compressor
- Box-type Compressor
Correct Answer

A. Centrifugal Compressors

Explanation

Centrifugal compressors are a type of compressor that are known for being quieter, having fewer vibration problems, requiring less maintenance, and offering better operating control. Unlike piston type/reciprocating compressors, screw-type compressors, and box-type compressors, centrifugal compressors use a rotating impeller to create pressure and move the gas or air. This design allows for smoother operation and reduced noise and vibration. Additionally, centrifugal compressors often have advanced control systems that provide better regulation and monitoring of the compression process. Overall, these features make centrifugal compressors a preferred choice in applications where noise, vibration, and maintenance are important considerations.

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16.

A compressor that uses two "screws" to compress refrigerant.
- Screw-type Compressor
- Piston Type or Reciprocating Compressor
- Centrifugal Compressor
- Box-type Compressor
Correct Answer

A. Screw-type Compressor

Explanation

A screw-type compressor is a type of compressor that uses two screws to compress refrigerant. This type of compressor is known for its efficiency and reliability. The two screws rotate in opposite directions, trapping the refrigerant between them and compressing it. This design allows for a continuous flow of refrigerant, resulting in smooth and efficient compression. Screw-type compressors are commonly used in industrial and commercial refrigeration systems. They are also known for their low noise levels and compact size.

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17.

An air-conditioning system used to identify refrigeration equipment having two or more components, one positioned inside the building and the other outside the building.
- Direct Expansion System
- Central Chilled Water System
- Cool Thermal Storage System
- Indirect Expansion System
Correct Answer

A. Direct Expansion System

Explanation

A direct expansion system is the correct answer because it is an air-conditioning system that utilizes refrigeration equipment with two or more components. One component is positioned inside the building, which is responsible for cooling the air, while the other component is positioned outside the building and is responsible for releasing heat. This system works by directly expanding the refrigerant in the evaporator coil to cool the air, making it an efficient and commonly used method for air conditioning.

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18.

An air-conditioning system that consists of a central chiller to cool water.
- Central Chilled Water System
- Direct Expansion System
- Indirect Expansion System
- Cool Thermal Storage System
Correct Answer

A. Central Chilled Water System

Explanation

A central chilled water system is an air-conditioning system that uses a central chiller to cool water, which is then circulated through a network of pipes to cool the air in a building. This system is commonly used in large commercial buildings and offers efficient cooling and temperature control throughout the entire space.

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19.

An air-conditioning system that produces and stores chilled water or generates a phase change in water. It stores the ice during low cooling demand periods for use during peak cooling load periods.
- Cool Thermal Storage System
- Direct Expansion System
- Indirect Expansion System
- Central Chilled Water System
Correct Answer

A. Cool Thermal Storage System

Explanation

A cool thermal storage system is an air-conditioning system that produces and stores chilled water or generates a phase change in water. It stores the ice during low cooling demand periods for use during peak cooling load periods. This system allows for energy efficiency by producing and storing chilled water or ice when demand is low, and then using it during peak demand periods, reducing the load on the system and saving energy.

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20.

A type of air-conditioning system installed either through walls or windows and exposed to outdoor air.
- Window Type (Individual)
- Packaged Type
- Split Type
- Multi-split Type
Correct Answer

A. Window Type (Individual)

Explanation

The correct answer is Window Type (Individual) because it is the only option listed that can be installed either through walls or windows and is exposed to outdoor air. Packaged Type, Split Type, and Multi-split Type are all different types of air-conditioning systems, but they are not specifically designed to be installed through walls or windows and exposed to outdoor air.

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21.

A type of air-conditioning system that is self-contained, air-cooled DX cooling unit with integral compressor. condenser, and evaporator.
- Package Type
- Window Type (Individual)
- Split Type
- Multi-split Type
Correct Answer

A. Package Type

Explanation

The correct answer is Package Type. A package type air-conditioning system is a self-contained unit that includes all the necessary components for cooling, such as the compressor, condenser, and evaporator. This type of system is commonly used in commercial buildings and large residential spaces. Unlike other types of air-conditioning systems, a package type unit does not require any additional components or connections, making it easy to install and maintain.

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22.

A type of air-conditioning system that has a condensing unit containing the compressor, condensing coil, and expansion valve outside the building and the evaporator located inside.
- Split Type
- Package Type
- Window Type (Individual)
- Multi-split Type
Correct Answer

A. Split Type

Explanation

A split type air-conditioning system is the correct answer because it is the only option that describes a system with a condensing unit containing the compressor, condensing coil, and expansion valve located outside the building, while the evaporator is located inside. This type of system is commonly used in residential and commercial buildings to provide cooling in specific areas or rooms.

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23.

It is the connection (copper pipe/tubing), of relatively small diameter, between the ACCU and FCU that carries high pressure refrigerant from the condenser to the expansion.
- Liquid Line
- Insulated Gas Line
- Chilled Water Line
- Vapor Line
Correct Answer

A. Liquid Line

Explanation

The correct answer is Liquid Line. The liquid line is the connection between the air conditioning condensing unit (ACCU) and the fan coil unit (FCU). It is a small diameter copper pipe or tubing that carries high-pressure refrigerant from the condenser to the expansion valve. This line is responsible for delivering the liquid refrigerant to the FCU, where it will evaporate and cool the air.

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24.

It is the connection (copper pipe/tubing), of relatively large diameter, between the ACCU and FCU that carries low pressure from the evaporator to the compressor.
- Insulated Gas Line
- Liquid Line
- Chilled Water Line
- Vapor Line
Correct Answer

A. Insulated Gas Line

Explanation

The correct answer is Insulated Gas Line. This is because the statement mentions that the connection carries low pressure from the evaporator to the compressor. Gas lines are typically used to transport refrigerant in HVAC systems, and they are insulated to prevent condensation and maintain the desired temperature.

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25.

A type of air-conditioning system that has a large central condensing unit (CCU) containing a compressor and expansion valve for several connected evaporator (FCU).
- Multi-split Type
- Window Type (Individual)
- Package Type
- Split Type
Correct Answer

A. Multi-split Type

Explanation

The correct answer is Multi-split Type. This type of air-conditioning system has a large central condensing unit (CCU) that contains a compressor and expansion valve. It is connected to several evaporator units (FCU) throughout the space being cooled. Each evaporator unit can be controlled individually, allowing for different temperature settings in different areas. This makes the multi-split type ideal for cooling multiple rooms or zones with different cooling needs.

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26.

A component of the Central Chilled Water System that is pre-assembled or site-built equipment containing coils (cooling or heating), filters, dampers, and fans that is used to condition and circulate air.
- Air Handling unit (AHU)
- Cooling Tower
- Chiller
- Pumps & Control
Correct Answer

A. Air Handling unit (AHU)

Explanation

An air handling unit (AHU) is a component of the Central Chilled Water System that conditions and circulates air. It contains coils for cooling or heating, filters to remove impurities, dampers to control airflow, and fans to circulate the air. The AHU is responsible for treating the air before it is distributed to the different areas of a building. It plays a crucial role in maintaining indoor air quality and temperature control.

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27.

A component of the Central Chilled Water System that expels heat from a chilled water system when water is cooled by directly or indirectly contacting the atmosphere.
- Cooling Tower
- Air Handling Unit (AHU)
- Chiller
- Pumps & Controls
Correct Answer

A. Cooling Tower

Explanation

A cooling tower is a component of the Central Chilled Water System that expels heat from a chilled water system. It achieves this by cooling the water through direct or indirect contact with the atmosphere. The cooling tower acts as a heat exchanger, transferring the heat from the water to the air, thus cooling the water and allowing it to be recirculated back into the system. This process helps maintain the desired temperature of the chilled water system and ensures its efficient operation.

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28.

A component of the Central Chilled Water System which is a cooling equipment that produces chilled water used to remove heat from the building
- Chiller
- Air Handling Unit (AHU)
- Cooling Tower
- Pumps & Controls
Correct Answer

A. Chiller

Explanation

A chiller is a component of the Central Chilled Water System that produces chilled water used to remove heat from a building. It is a cooling equipment that circulates the chilled water through the building's air handling units (AHUs) to cool the air and maintain a comfortable temperature. The chiller works by extracting heat from the building and transferring it to the chilled water, which is then circulated back to the AHUs. This process helps to regulate the temperature and provide cooling for the building.

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29.

A type of chiller that is commonly used.
- Vapor Compression Chiller
- Absorption Chiller
- Non-vapor Compression Chiller
- Non-absorption Chiller
Correct Answer

A. Vapor Compression Chiller

Explanation

A vapor compression chiller is a type of chiller that is commonly used. It works by using a refrigerant to absorb heat from a process or space and then compressing it to release the heat elsewhere. This process allows the chiller to cool the desired area efficiently. Vapor compression chillers are widely used in various industries and applications due to their effectiveness and reliability in cooling processes.

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30.

A type of chiller which uses an absorption cycle that uses two fluids (refrigerant and absorbent).
- Absorption Chiller
- Non-absorption Chiller
- Vapor Compression Chiller
- Non-vapor Compression Chiller
Correct Answer

A. Absorption Chiller

Explanation

An absorption chiller is a type of chiller that utilizes an absorption cycle, where two fluids, a refrigerant and an absorbent, are used. This cycle allows the chiller to produce cooling by absorbing heat from a source and then releasing it elsewhere. Unlike vapor compression chillers, which use a mechanical compressor, absorption chillers rely on the chemical reaction between the refrigerant and absorbent to achieve cooling. This makes absorption chillers more energy-efficient and suitable for applications where waste heat or low-grade heat sources are available.

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31.

A type of chiller (according to compressor) that has a component that compresses the vapor flowing through it by spinning it from the center of an impeller wheel radially outward so that centrifugal forces compress the vapor.
- Centrifugal Chiller
- Screw Chiller
- Scroll Chiller
- Reciprocating Chiller
Correct Answer

A. Centrifugal Chiller

Explanation

A centrifugal chiller is a type of chiller that uses a component called an impeller wheel to compress the vapor flowing through it. The impeller wheel spins the vapor from the center radially outward, creating centrifugal forces that compress the vapor. This compression process helps to cool the fluid or air passing through the chiller.

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32.

A type of chiller (according to compressor) which has a component that is a positive displacement device which the refrigerant chamber is actively compressed to a smaller volume.
- Screw Chiller
- Centrifugal Chiller
- Scroll Chiller
- Reciprocating Chiller
Correct Answer

A. Screw Chiller

Explanation

A screw chiller is a type of chiller that uses a positive displacement device, known as a screw compressor, to actively compress the refrigerant chamber to a smaller volume. This compression process increases the pressure and temperature of the refrigerant, allowing it to absorb heat from the surroundings and cool the desired area. Screw chillers are known for their efficiency and reliability, making them a popular choice for various cooling applications.

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33.

A type of chiller (according to compressor) which has a component that employs a rotating twisted rod as the screw compressor; twisting of the scroll compresses the refrigerant thus increasing its pressure.
- Scroll Chiller
- Centrifugal Chiller
- Screw Chiller
- Reciprocating Chiller
Correct Answer

A. Scroll Chiller

Explanation

A scroll chiller is a type of chiller that uses a component called a scroll compressor. The scroll compressor consists of a rotating twisted rod that compresses the refrigerant by twisting the scroll. This twisting action increases the pressure of the refrigerant, allowing it to cool the desired space efficiently.

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34.

A type of chiller (according to compressor) which has a component that is a type of positive displacement compressor that relies on the back and forth motion of a piston in a cylinder to compress the refrigerant.
- Reciprocating Chiller
- Centrifugal Chiller
- Screw Chiller
- Scroll Chiller
Correct Answer

A. Reciprocating Chiller

Explanation

A reciprocating chiller is a type of chiller that uses a positive displacement compressor with a piston and cylinder mechanism to compress the refrigerant. This means that the piston moves back and forth in the cylinder to compress the refrigerant, creating the necessary pressure for cooling. This type of chiller is known for its efficiency and reliability, making it a popular choice in many cooling applications.

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35.

A type of chiller (according to condenser) which utilizes cool water to produce chilled water.
- Water-Cooled Chiller
- Air-Cooled Chiller
- Scroll Chiller
- Screw Chiller
Correct Answer

A. Water-Cooled Chiller

Explanation

A water-cooled chiller is a type of chiller that uses cool water to produce chilled water. Unlike an air-cooled chiller, which uses ambient air to cool the refrigerant, a water-cooled chiller relies on water as the cooling medium. This type of chiller is commonly used in large commercial and industrial applications where a significant amount of cooling is required. The cool water is circulated through the chiller's condenser, removing heat from the refrigerant and allowing it to be cooled and reused to produce chilled water.

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36.

A type of chiller (according to condenser) which utilizes outside air to produce chilled water.
- Air-Cooled Chiller
- Water-Cooled Chiller
- Screw Chiller
- Scroll Chiller
Correct Answer

A. Air-Cooled Chiller

Explanation

An air-cooled chiller is a type of chiller that uses outside air to produce chilled water. Unlike water-cooled chillers that require a cooling tower and water source, an air-cooled chiller eliminates the need for these additional components by using the ambient air to cool the refrigerant and condense it into chilled water. This makes air-cooled chillers more cost-effective and easier to install and maintain.

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37.

A type of air distribution system which provides a steady airflow into spaces of the building while varying the temperature of air to meet cooling or heating demands.
- Constant Air Volume (CAV) / Constant Volume Variable Temperature
- Variable Air Volume (VAV) / Variable Air Constant Temperature
- Continuous Air Volume (CAV) / Constant Volume Variable Temperature
- Volatile Air Volume (VAV) / Variable Air Constant Temperature
Correct Answer

A. Constant Air Volume (CAV) / Constant Volume Variable Temperature

Explanation

The correct answer is Constant Air Volume (CAV) / Constant Volume Variable Temperature. This air distribution system provides a steady airflow into spaces of the building while varying the temperature of air to meet cooling or heating demands. This means that the volume of air remains constant, but the temperature can be adjusted as needed.

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38.

A type of air distribution system which holds supply air to a constant temperature and controls temperature within a space by varying the quantity of supply air.
- Variable Air Volume (VAV) / Variable Volume Constant Temperature
- Constant Air Volume (CAV) / Constant Volume Variable Temperature
- Volatile Air Volume (VAV) / Variable Volume Constant Temperature
- Continuous Air Volume (CAV) / Constant Volume Variable Temperature
Correct Answer

A. Variable Air Volume (VAV) / Variable Volume Constant Temperature

Explanation

Variable Air Volume (VAV) is a type of air distribution system that maintains a constant temperature by adjusting the quantity of supply air. This means that the system can vary the volume of air supplied to a space based on the temperature requirements, ensuring that the temperature remains constant. In contrast, Constant Air Volume (CAV) systems maintain a constant volume of air but vary the temperature, making them different from the given description. Volatile Air Volume (VAV) and Continuous Air Volume (CAV) are not recognized terms in the context of air distribution systems.

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39.

A distribution component that conveys and transfers air in the HVAC system. It can be round, oval, or rectangular section.
- Duct
- Pipe
- Conduit
- Shaft
Correct Answer

A. Duct

Explanation

A duct is a component in an HVAC system that is used to convey and transfer air. It can have a round, oval, or rectangular section. Unlike pipes, which are typically used for the transportation of liquids or gases, ducts are specifically designed for air distribution. Similarly, conduits are used for the protection and routing of electrical wiring, not for air transfer. Shafts, on the other hand, are vertical or inclined passages used for various purposes such as ventilation or access, but they are not specifically designed for air conveyance in HVAC systems.

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40.

The aspect ratio of the long side to short side; not exceed 5:1 although ___ or ___ is preferred.
- 4:1 or 3:1
- 3:1 or 2:1
- 2:1 or 1:1
- 4.5:1 or 3.5:1
Correct Answer

A. 4:1 or 3:1

Explanation

The aspect ratio refers to the ratio of the long side to the short side of an object or image. In this question, it is stated that the aspect ratio should not exceed 5:1. However, it is also mentioned that either 4:1 or 3:1 is preferred. This means that while the aspect ratio can be as high as 5:1, it is recommended to keep it within the range of 4:1 or 3:1 for better visual aesthetics.

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41.

A type of duct that supplies conditioned air from AHU or FCU.
- Supply Pipe
- Fresh Pipe
- Exhaust Pipe
- Return Pipe
Correct Answer

A. Supply Pipe

Explanation

A supply pipe is a type of duct that transports conditioned air from an air handling unit (AHU) or fan coil unit (FCU) to the desired space. It is responsible for delivering the treated air to provide cooling or heating in a building. The supply pipe ensures that the conditioned air reaches the intended area efficiently and effectively, maintaining a comfortable indoor environment for occupants.

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42.

A type of duct that removes air from conditioned spaces and return the air to the AHU or FCU. Some air can be exhausted to the exterior.
- Return Air Duct
- Fresh Air Duct
- Exhaust Air Duct
- Supply Air Duct
Correct Answer

A. Return Air Duct

Explanation

A return air duct is a type of duct that removes air from conditioned spaces and returns it to the air handling unit (AHU) or fan coil unit (FCU). It is responsible for extracting the air that has already been conditioned and distributing it back to the HVAC system for further processing. Some of the air may also be exhausted to the exterior if needed.

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43.

A type of duct that is also known as Outdoor Air Ducts. It supplies fresh air to the AHU and is used for ventilating building spaces.
- Fresh Air Duct
- Supply Air Duct
- Return Air Duct
- Exhaust Air Duct
Correct Answer

A. Fresh Air Duct

Explanation

A fresh air duct is a type of duct that supplies fresh air to the air handling unit (AHU) and is used for ventilating building spaces. It is also known as outdoor air ducts because it brings in fresh air from outside the building. This duct helps to maintain air quality and provide a constant supply of fresh air for occupants.

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44.

A type of duct that is also known as Relief Air Ducts. It carries and discharges air to the outdoors.
- Exhaust Air Duct
- Supply Air Duct
- Return Air Duct
- Fresh Air Duct
Correct Answer

A. Exhaust Air Duct

Explanation

The correct answer is Exhaust Air Duct because it is a type of duct that carries and discharges air to the outdoors. This type of duct is commonly used in ventilation systems to remove stale or contaminated air from a space and release it outside. It helps to maintain indoor air quality by removing pollutants and odors.

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45.

A type of duct that mixes air from the outdoor air and return air ductworks and supplies this mixed air to the AHU.
- Mixed Air Duct
- Combination Air Duct
- Supply Air Duct
- Return Air Duct
Correct Answer

A. Mixed Air Duct

Explanation

A mixed air duct is a type of duct that combines outdoor air and return air from ductworks and delivers this mixture to the air handling unit (AHU). This duct is responsible for ensuring that the AHU receives a proper balance of fresh outdoor air and recirculated air from the building. By mixing the two air streams, the mixed air duct helps maintain the desired temperature and quality of air within the HVAC system.

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46.

A distribution component that is mounted on walls or ceiling.
- Air Outlets
- Wall Outlets
- Ceiling Outlets
- Duct
Correct Answer

A. Air Outlets

Explanation

Air outlets are a distribution component that is commonly mounted on walls or ceilings. They are designed to release conditioned air into a room or space. By being positioned on walls or ceilings, air outlets can effectively distribute the air throughout the area, ensuring proper ventilation and temperature control. This placement also allows for easy access and maintenance. Therefore, air outlets are the correct answer in this case.

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47.

A control component which is an air flow control device used in ductwork to vary volume of air passing through an air outlet, air inlet, or duct.
- Volume Control Dampers
- Fans
- Motors
- VFD / VFI / VSD
Correct Answer

A. Volume Control Dampers

Explanation

Volume Control Dampers are air flow control devices used in ductwork to regulate the volume of air passing through an air outlet, air inlet, or duct. They are designed to adjust the airflow based on the specific requirements of a system or space. By opening or closing the dampers, the volume of air can be increased or decreased, allowing for precise control over the airflow. This is especially useful in HVAC systems where maintaining a specific air volume is necessary for optimal performance and comfort.

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48.

A control component which is a mechanical device that uses rotating air foil blades or vanes to continuously move air.
- Fans
- Volume Control Damper
- Motors
- VFD / VFI / VSD
Correct Answer

A. Fans

Explanation

Fans are a type of control component that use rotating air foil blades or vanes to continuously move air. They are commonly used in various applications to provide ventilation, cooling, or air circulation. Fans can be found in HVAC systems, electronics cooling, industrial processes, and many other settings where air movement is required. They are typically powered by electric motors and can be controlled using variable frequency drives (VFD), variable frequency inverters (VFI), or variable speed drives (VSD) to adjust the speed and airflow.

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49.

A control component which is an electric motor known as "Drive".
- Motors
- Ducts
- Fans
- VFD / VFI / VSD
Correct Answer

A. Motors

Explanation

The correct answer is "Motors" because the question is asking for the control component that is an electric motor known as "Drive." Therefore, the correct answer is motors, as they are the control component in this scenario.

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Current Version
Nov 16, 2023

Quiz Edited by
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Jan 03, 2020

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A substance that produces a refrigerating effect while expanding or vaporizing as it circulates as a gas or liquid through a closed vapor-compression refrigeration system.

List all common refrigerants:

List all obsolete refrigerants:

Cooling capacity: How many BTU/HR per 1 ton

Network of tubes filled with refrigerant that absorbs heat from air or liquid and moves it outside the refrigerated area by means of a refrigerant.

Network of tubes that discharges unwanted heat from the refrigerant to a medium (e.g. air, water, or combination) that absorbs the heat.

A pump-like equipment that drives (via electric motor) the refrigerant from the evaporator to the condenser and back to the evaporator again.

Controls liquid refrigerant passing through a very small orifice, which causes the refrigerant to expand to low-pressure/low temperature gas.

Type of condenser used in unit and packaged-type air-conditioners.

Type of condenser used in centralized systems.

Type of evaporator wherein the refrigerant is expanded into a shell enclosing the tube through which the water flows.

Type of evaporator wherein the coils containing the refrigerant itself

A type of compressor for tonnages up to 100 tons.

A type of compressor that are quieter, have fewer vibration problems, require less maintenance and with better operating control.

A compressor that uses two "screws" to compress refrigerant.

An air-conditioning system used to identify refrigeration equipment having two or more components, one positioned inside the building and the other outside the building.

An air-conditioning system that consists of a central chiller to cool water.

An air-conditioning system that produces and stores chilled water or generates a phase change in water. It stores the ice during low cooling demand periods for use during peak cooling load periods.

A type of air-conditioning system installed either through walls or windows and exposed to outdoor air.

A type of air-conditioning system that is self-contained, air-cooled DX cooling unit with integral compressor. condenser, and evaporator.

A type of air-conditioning system that has a condensing unit containing the compressor, condensing coil, and expansion valve outside the building and the evaporator located inside.

It is the connection (copper pipe/tubing), of relatively small diameter, between the ACCU and FCU that carries high pressure refrigerant from the condenser to the expansion.

It is the connection (copper pipe/tubing), of relatively large diameter, between the ACCU and FCU that carries low pressure from the evaporator to the compressor.

A type of air-conditioning system that has a large central condensing unit (CCU) containing a compressor and expansion valve for several connected evaporator (FCU).

A component of the Central Chilled Water System that is pre-assembled or site-built equipment containing coils (cooling or heating), filters, dampers, and fans that is used to condition and circulate air.

A component of the Central Chilled Water System that expels heat from a chilled water system when water is cooled by directly or indirectly contacting the atmosphere.

A component of the Central Chilled Water System which is a cooling equipment that produces chilled water used to remove heat from the building

A type of chiller that is commonly used.

A type of chiller which uses an absorption cycle that uses two fluids (refrigerant and absorbent).

A type of chiller (according to compressor) that has a component that compresses the vapor flowing through it by spinning it from the center of an impeller wheel radially outward so that centrifugal forces compress the vapor.

A type of chiller (according to compressor) which has a component that is a positive displacement device which the refrigerant chamber is actively compressed to a smaller volume.

A type of chiller (according to compressor) which has a component that employs a rotating twisted rod as the screw compressor; twisting of the scroll compresses the refrigerant thus increasing its pressure.

A type of chiller (according to compressor) which has a component that is a type of positive displacement compressor that relies on the back and forth motion of a piston in a cylinder to compress the refrigerant.

A type of chiller (according to condenser) which utilizes cool water to produce chilled water.

A type of chiller (according to condenser) which utilizes outside air to produce chilled water.

A type of air distribution system which provides a steady airflow into spaces of the building while varying the temperature of air to meet cooling or heating demands.

A type of air distribution system which holds supply air to a constant temperature and controls temperature within a space by varying the quantity of supply air.

A distribution component that conveys and transfers air in the HVAC system. It can be round, oval, or rectangular section.

The aspect ratio of the long side to short side; not exceed 5:1 although ___ or ___ is preferred.

A type of duct that supplies conditioned air from AHU or FCU.

A type of duct that removes air from conditioned spaces and return the air to the AHU or FCU. Some air can be exhausted to the exterior.

A type of duct that is also known as Outdoor Air Ducts. It supplies fresh air to the AHU and is used for ventilating building spaces.

A type of duct that is also known as Relief Air Ducts. It carries and discharges air to the outdoors.

A type of duct that mixes air from the outdoor air and return air ductworks and supplies this mixed air to the AHU.

A distribution component that is mounted on walls or ceiling.

A control component which is an air flow control device used in ductwork to vary volume of air passing through an air outlet, air inlet, or duct.

A control component which is a mechanical device that uses rotating air foil blades or vanes to continuously move air.

A control component which is an electric motor known as "Drive".

The aspect ratio of the long side to short side; not exceed 5:1 although _ or _ is preferred.