Indoor Temperature Control Quiz

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  • 1/121 Questions

    In order to prevent a duct-mounted electric heater from being energized when the fan is not on, an _________ should be used.

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About This Quiz

Depending on the outside temperature and the heating habits of residents, the heating requirements of rooms, apartments and entire buildings are constantly changing. Radiator thermostats and room temperature controller systems compensate for these fluctuations.
Know how Indoor temperature controlling works in this Indoor temperature control quiz

Indoor Temperature Control Quiz - Quiz

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  • 2. 

    The amount of heat energy in 1 watt of electrical energy is _________.

    Explanation
    The correct answer is 3.413. This is because 1 watt of electrical energy is equivalent to 3.413 BTUs (British Thermal Units) of heat energy. BTUs are commonly used to measure the amount of heat energy produced or transferred. Therefore, 1 watt of electrical energy can be converted into 3.413 BTUs of heat energy.

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  • 3. 

    If the fan were to fail and the limit switch stuck closed, the element would be cut off by the _________.

    Explanation
    If the fan were to fail and the limit switch stuck closed, the element would be cut off by the fusible link. A fusible link is a safety device that is designed to melt or break in the event of excessive heat or current. In this scenario, if the fan fails and the limit switch gets stuck closed, it means that the element will continue to heat up without any cooling from the fan. This can lead to excessive heat buildup and potentially cause damage or a fire hazard. However, the presence of a fusible link ensures that if the temperature rises to a dangerous level, the link will melt or break, cutting off the element and preventing further damage or hazards.

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  • 4. 

    In order to provide time delay between stages of electric heat, the controls that are used are called _________.

    Explanation
    Sequencers are used to provide a time delay between stages of electric heat. They are controls specifically designed for this purpose, allowing for the activation and deactivation of different heating elements in a sequential manner. By using sequencers, the stages of electric heat can be properly coordinated and controlled, ensuring efficient and effective heating.

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  • 5. 

    The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) has guidelines governing indoor air quality.  These guidelines are called ASHRAE Standard _________.

    Explanation
    The correct answer is 62-2001. ASHRAE Standard 62-2001 is a set of guidelines established by the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) to regulate indoor air quality. It provides recommendations for ventilation rates, filtration, and other measures to ensure a healthy and comfortable indoor environment.

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  • 6. 

    Environmental tobacco smoke (ETS) is more commonly known as _________.

    Explanation
    Environmental tobacco smoke (ETS) refers to the smoke that is emitted from the burning end of a cigarette, as well as the smoke exhaled by the smoker. This smoke contains numerous harmful chemicals and toxins, including nicotine, carbon monoxide, and carcinogens. When non-smokers are exposed to this smoke, either by breathing it in directly or through contact with surfaces that have been contaminated by smoke, it is known as second-hand smoke. Second-hand smoke poses serious health risks to individuals, particularly children and those with pre-existing respiratory conditions.

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  • 7. 

    Steel filters are economical since they are _________.

    Explanation
    Steel filters are economical because they have a long lifespan and do not need to be replaced frequently. Unlike other types of filters that may wear out or become clogged over time, steel filters are durable and can withstand repeated use without losing their effectiveness. This makes them a cost-effective option for filtration systems, as they do not require regular maintenance or replacement.

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  • 8. 

    When odor is a concern, a filter containing _________ should be used.

    Explanation
    When odor is a concern, a filter containing charcoal should be used. Charcoal is known for its ability to absorb and trap odors, making it an effective choice for filtering out unpleasant smells. It has a porous structure that allows it to capture and hold onto odor-causing molecules, preventing them from circulating in the air. This makes charcoal filters ideal for use in various applications where odor control is important, such as air purifiers, water filters, and even in masks or respirators.

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  • 9. 

    The two types of atomizing humidifiers are the _________ and _________.

    Explanation
    The correct answer is "centrifugal, spray nozzle." This means that there are two types of atomizing humidifiers: one is centrifugal, and the other is a spray nozzle. The centrifugal type uses centrifugal force to create a fine mist of water particles, while the spray nozzle type uses a nozzle to spray water droplets into the air.

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  • 10. 

    In the ionizing section of an electronic air cleaner, the particles in the air are _________.

    Explanation
    In the ionizing section of an electronic air cleaner, the particles in the air are electrically charged. This is because the ionizing section of the air cleaner uses a high voltage to create ions, which are charged particles. These ions then attach themselves to the particles in the air, giving them an electrical charge. This charged state allows the particles to be attracted to oppositely charged plates in the air cleaner, effectively removing them from the air.

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  • 11. 

    Deep extended surface air filters are up to three times more efficient than regular air filters because the filter media used is _________.

    Explanation
    Deep extended surface air filters are up to three times more efficient than regular air filters because the filter media used is non-woven cotton. Non-woven cotton filters have a higher surface area and better filtration capabilities compared to regular filters made of other materials. The non-woven cotton fibers are arranged in a random pattern, creating smaller pores that can trap smaller particles, including dust, pollen, and other pollutants. This increased efficiency of the filter media allows for better air quality and improved filtration performance.

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  • 12. 

    For high-efficiency fossil fuel and electronic furnaces as well as heat pump systems, the recommended humidifier would be an _________ type.

    Explanation
    The recommended humidifier for high-efficiency fossil fuel and electronic furnaces as well as heat pump systems would be an electrical type. This is because electrical humidifiers are specifically designed to work efficiently with these types of heating systems. They can provide the necessary humidity levels without interfering with the combustion process or causing any damage to the electronic components. Additionally, electrical humidifiers are easy to install and maintain, making them a practical choice for these heating systems.

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  • 13. 

    To remove odors, downstream from air filters, a filter using a material called _________ is used.

    Explanation
    Activated charcoal is used as a filter material downstream from air filters to remove odors. Activated charcoal is a highly porous form of carbon that has been treated to have a large surface area, allowing it to effectively adsorb and trap odor-causing molecules. The activated charcoal acts like a sponge, attracting and trapping the odor molecules as the air flows through the filter. This helps to improve the air quality by removing unpleasant odors and making the air cleaner and fresher.

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  • 14. 

    On a system equipped with gas heat and electric air conditioning, automatic blower operation is controlled by the _________ for cooling and by the _________ for heating.

    Explanation
    On a system equipped with gas heat and electric air conditioning, the automatic blower operation is controlled by the fan relay for cooling and by the limit switch for heating. The fan relay is responsible for activating the blower when the air conditioning is turned on, ensuring that cool air is circulated throughout the space. On the other hand, the limit switch is responsible for activating the blower when the heating system is turned on, ensuring that warm air is distributed effectively.

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  • 15. 

    It is common to see a _________ fan on systems that provide heating as well as cooling.

    Explanation
    A multi-speed fan is commonly used in systems that provide both heating and cooling because it allows for better control over the airflow. Different speeds can be selected depending on the desired temperature and comfort level. This flexibility ensures that the fan can efficiently distribute warm or cool air throughout the space, providing optimal heating and cooling performance.

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  • 16. 

    When two transformers are wired in parallel, care must be taken to ensure that they are wired _________.

    Explanation
    When two transformers are wired in parallel, it is important to ensure that they are wired in phase. This means that the primary and secondary windings of both transformers are connected in the same way. When transformers are in phase, the voltage and current waveforms are synchronized, allowing them to work together efficiently. If they are not in phase, it can lead to imbalances in the distribution of power and potential damage to the transformers.

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  • 17. 

    A heating anticipator is wired in _________ with the heating contacts.

    Explanation
    A heating anticipator is wired in series with the heating contacts. This means that the heating anticipator is connected in a circuit where the current flows through the heating contacts first and then through the heating anticipator. By being in series, the heating anticipator can regulate the flow of current to the heating contacts, allowing for better control of the heating system.

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  • 18. 

    A cooling anticipator is wired in _________ with the cooling contacts.

    Explanation
    A cooling anticipator is wired in parallel with the cooling contacts. This means that both the cooling anticipator and the cooling contacts are connected to the same power source and operate independently. In this configuration, the cooling anticipator can adjust the temperature settings without affecting the operation of the cooling contacts. It allows for more precise control of the cooling system as the anticipator can fine-tune the temperature based on the desired settings.

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  • 19. 

    The efficiency of a heat pump operating in the heat mode tends to _________ as the outside air temperature drops.

    Explanation
    As the outside air temperature drops, the efficiency of a heat pump operating in the heat mode tends to decrease. This is because the heat pump relies on extracting heat from the outside air and transferring it indoors. As the temperature difference between the outside air and the desired indoor temperature decreases, it becomes harder for the heat pump to extract heat effectively. Therefore, the efficiency decreases as the outside air temperature drops.

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  • 20. 

    When thermostatic expansion valves are used on heat pump systems, _________ thermal bulbs are most common in order to prevent the valve's diaphragm from rupturing.

    Explanation
    The correct answer is "limited charge." When thermostatic expansion valves are used on heat pump systems, limited charge thermal bulbs are most common in order to prevent the valve's diaphragm from rupturing. This is because limited charge thermal bulbs have a smaller charge of refrigerant, which reduces the pressure and prevents excessive force on the valve's diaphragm.

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  • 21. 

    If a heat pump is not capable of handling the heat load, an _________ will be added to help handle the load.

    Explanation
    When a heat pump is unable to handle the heat load, an auxiliary heat source is added to assist in managing the load. This auxiliary heat can be provided by an auxiliary heater, which helps to supplement the heating capacity of the heat pump. The auxiliary heat or auxiliary heater is used as a backup or additional heating source to ensure that the desired temperature is maintained efficiently.

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  • 22. 

    The indoor coil acts as a the _________ in the summer and as the _________ in the winter.

    Explanation
    In the summer, the indoor coil acts as the evaporator, which is responsible for absorbing heat from the indoor air and transferring it to the refrigerant. This helps cool down the air inside the building. In the winter, the indoor coil acts as the condenser, which is responsible for releasing heat into the indoor air by condensing the refrigerant. This helps warm up the air inside the building.

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  • 23. 

    In time-temperature defrost controls, the temperature that actuates the control is the temperature of the _________.

    Explanation
    The correct answer is "outdoor coil" or "outside coil". In time-temperature defrost controls, the control is actuated by the temperature of the outdoor coil or outside coil. This means that when the temperature of the outdoor coil reaches a certain threshold, the defrost control is triggered and initiates the defrost cycle. This is important in preventing ice buildup on the outdoor coil and ensuring proper heat transfer in the system.

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  • 24. 

    When a heat pump is supplying as much as the load requires and is operating continuously, it is at what is called the _________.

    Explanation
    When a heat pump is supplying as much as the load requires and is operating continuously, it is at what is called the balance point. This means that the heat pump is able to meet the heating demands of the space without any excess or shortfall. The balance point represents the equilibrium where the heat pump's output matches the heat loss of the building, resulting in a stable and comfortable indoor temperature.

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  • 25. 

    When electric auxiliary heat is used with a heat pump, the best location of the inside coil is _________ the auxiliary heat unit.

    Explanation
    When electric auxiliary heat is used with a heat pump, the best location of the inside coil is before the auxiliary heat unit. This means that the inside coil should be placed in the airflow path before the auxiliary heat unit. By doing so, the air passing through the inside coil will be preheated before it reaches the auxiliary heat unit, allowing for more efficient heating. Placing the inside coil after the auxiliary heat unit would result in the air being heated twice, leading to unnecessary energy consumption and reduced efficiency.

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  • 26. 

    When oil or gas auxiliary heat is used with a heat pump, the heat pump coil must be located in the _________ of the furnace.

    Explanation
    When oil or gas auxiliary heat is used with a heat pump, the heat pump coil must be located in the outlet air stream of the furnace. This is because the heat pump coil needs to be positioned where the air is being discharged from the furnace in order to effectively transfer heat. By placing the heat pump coil in the outlet air stream, the heat pump can extract heat from the air and supplement the heating process, improving the overall efficiency and performance of the system.

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  • 27. 

    Geothermal heat pumps use the _________ or _________ as a heat source or a heat sink.

    Explanation
    Geothermal heat pumps utilize the earth as both a heat source and a heat sink. They extract heat from the earth during the winter to warm the building and transfer heat back into the earth during the summer to cool the building. Additionally, geothermal heat pumps can also use water from the earth as a heat source or a heat sink, further enhancing their efficiency and versatility.

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  • 28. 

    A(n) _________ systems uses water from the Earth and then, after the cycle is complete, returns the water to the Earth.

    Explanation
    An open-loop system is a type of system that uses water from the Earth and then returns it back to the Earth after completing the cycle. In an open-loop system, the water is sourced from the Earth, typically from a well or a natural water source, and then used for various purposes such as heating or cooling. Once the water has served its purpose, it is discharged back into the Earth, either through a drain or by being re-injected into a well. This type of system is commonly used for geothermal heating and cooling, where the Earth's natural heat is utilized.

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  • 29. 

    A(n) _________ systems reuses the same fluid over and over and is contained in a sealed piping arrangement.

    Explanation
    A closed-loop system is a type of system that uses the same fluid repeatedly and is enclosed in a sealed piping arrangement. This means that the fluid is not released or replenished, but rather circulates within the system. The closed-loop system is designed to be efficient and minimize waste by reusing the fluid, making it a cost-effective and environmentally friendly option.

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  • 30. 

    Before deciding to purchase or install an open-loop system, the _________ must be evaluated first.

    Explanation
    Before deciding to purchase or install an open-loop system, the water quality must be evaluated first. This is because the effectiveness and efficiency of an open-loop system heavily depend on the quality of the water being used. Poor water quality can lead to clogging, corrosion, and reduced performance of the system. Additionally, certain contaminants in the water, such as high levels of minerals or chemicals, can cause damage to the system components over time. Therefore, evaluating the water quality is essential to ensure the system operates optimally and to avoid potential problems and costly repairs.

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  • 31. 

    Four types of group loop configurations are _________, _________, _________, and _________.(Answer alphabetically)

    Explanation
    The correct answer is "horizontal, lake, slinky, vertical". This is because the answer options are listed in alphabetical order, and this sequence matches that order.

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  • 32. 

    The ground loop configuration that is used when there is a shortage of land is the _________.

    Explanation
    When there is a shortage of land, the vertical system is used as the ground loop configuration. This system involves drilling deep boreholes vertically into the ground and installing a loop of pipe. The vertical system is ideal for areas where there is limited space available, as it requires less land area compared to other ground loop configurations. By utilizing the vertical system, it is possible to efficiently harness geothermal energy for heating and cooling purposes even in areas with land constraints.

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  • 33. 

    Three common types of antifreeze are _________, _________, and _________. (Answer alphabetically, plural form)

    Explanation
    The correct answer is alcohols, glycols, salts. These three substances are commonly used as antifreeze. Alcohols, such as ethylene glycol and propylene glycol, are widely used in automotive antifreeze solutions. Glycols are also effective in preventing freezing and are commonly used in heating and cooling systems. Salts, such as calcium chloride and potassium acetate, are used in some antifreeze formulations for their ability to lower the freezing point of water.

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  • 34. 

    A dry well is most commonly used a s part of a(n) _________ system.

    Explanation
    A dry well is most commonly used as part of an open-loop system.

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  • 35. 

    A set of contacts actuated by a magnetic coil is called a _________.

    Explanation
    A set of contacts actuated by a magnetic coil is called a contactor. A contactor is an electrical device that is used to control the flow of electric current in a circuit. When the magnetic coil is energized, it creates a magnetic field that attracts the contacts, closing the circuit and allowing the current to flow. Contactors are commonly used in industrial and commercial applications to control motors, lighting systems, and other electrical loads. They are designed to handle high currents and voltages, making them suitable for heavy-duty applications.

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  • 36. 

    A set of contacts actuated by a bimetal heat motor is called a _________.

    Explanation
    A set of contacts actuated by a bimetal heat motor is commonly known as a sequencer. A sequencer is a device that controls the timing and sequence of electrical components in a system. In this case, the bimetal heat motor is responsible for actuating the contacts, which then control the electrical circuitry.

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  • 37. 

    Geothermal heat pumps will _________ heat from the Earth and transfer it to the conditioned space in the winter and _________ the heat that is absorbed from the conditioned space in the summer of the Earth.

    Explanation
    Geothermal heat pumps are designed to extract heat from the Earth and transfer it to the conditioned space during the winter, which helps to warm the area. In the summer, these heat pumps absorb the heat from the conditioned space and reject it back into the Earth, effectively cooling the area.

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  • 38. 

    A "dedicated" geothermal well is part of a(n) _________ system.

    Explanation
    A "dedicated" geothermal well is part of a closed-loop system. In a closed-loop system, the geothermal well is connected to a heat pump, which circulates a fluid through the well to extract heat from the earth. The fluid then transfers the heat to the heat pump, which uses it to heat or cool a building. The closed-loop system ensures that the fluid remains contained within the loop and does not mix with the surrounding environment, making it an efficient and environmentally friendly way to harness geothermal energy.

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  • 39. 

    Temperature, quantity, and cleanliness are three important factors that should be addressed when referring to water quality.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement correctly states that temperature, quantity, and cleanliness are important factors in determining water quality. These factors play a crucial role in assessing the suitability of water for various purposes such as drinking, agriculture, and industrial use. Temperature affects the biological and chemical processes in water, quantity determines the availability of water resources, and cleanliness ensures the absence of contaminants and pollutants. Therefore, addressing these factors is essential in maintaining good water quality.

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  • 40. 

    When brazing a 4-way reversing valve, heat absorbing paste should be placed around the body of the valve to minimize the chance of internal damage to the valve.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When brazing a 4-way reversing valve, heat absorbing paste should be placed around the body of the valve to minimize the chance of internal damage to the valve. This is because brazing involves high temperatures that can potentially damage the internal components of the valve. The heat absorbing paste helps to distribute and absorb the excess heat, protecting the valve from potential damage.

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  • 41. 

    One potential safety hazard that all technicians should be aware of when working on an electric furnace is that there are many exposed electrical connections.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Technicians should be aware of the potential safety hazard of exposed electrical connections when working on an electric furnace. This is because these connections can pose a risk of electric shock or short circuit if not handled properly. It is important for technicians to take necessary precautions, such as wearing appropriate personal protective equipment and ensuring that the power is turned off before working on the furnace, to avoid accidents and ensure their safety.

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  • 42. 

    Caution must be used with changing from one filter type to another.  If a technician installs a high density filter in this application, it is very likely the air flow will be reduced because the same filter area is used with a more dense filter.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Changing from one filter type to another can have an impact on air flow. If a technician installs a high density filter in this application, it is likely that the air flow will be reduced. This is because the same filter area is used with a more dense filter, which restricts the passage of air. Therefore, caution must be exercised when changing filter types to avoid potential issues with air flow.

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  • 43. 

    In the emergency heat mode, the auxiliary heat source becomes the primary heat source and the compressor is disabled.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In the emergency heat mode, the auxiliary heat source takes over as the primary heat source, meaning it is responsible for providing the majority of the heat. The compressor, which is typically used to provide heat in the normal heating mode, is disabled in this mode. This is done to ensure that the auxiliary heat source can operate efficiently and effectively in providing heat to the space. Therefore, the statement is true.

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  • 44. 

    The main purpose of adding a humidifier to a heating system is to replace the moisture that is removed by the heating equipment.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Adding a humidifier to a heating system helps to replenish the moisture that is lost due to the heating equipment. Heating systems, especially those that use forced air, tend to dry out the air in the environment, leading to dry skin, irritated sinuses, and other discomforts. By adding a humidifier, moisture is introduced back into the air, creating a more comfortable and healthier indoor environment.

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  • 45. 

    Generally speaking, electric heat is very efficient but costs more when compared to oil and gas.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Electric heat is generally more efficient than oil and gas because it converts nearly all the energy it uses into heat. In contrast, oil and gas heating systems may lose some energy through combustion or heat transfer. However, electric heat is typically more expensive to operate because electricity is often priced higher than oil or gas. Therefore, the statement that electric heat is very efficient but costs more when compared to oil and gas is true.

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  • 46. 

    In a closed-loop system, the same fluid (water or water and antifreeze) will absorb heat from the ground in the winter and reject the heat to the ground in the summer.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In a closed-loop system, the same fluid is used to absorb heat from the ground in the winter and reject the heat back to the ground in the summer. This means that the fluid circulates within the system, transferring heat as needed to maintain a comfortable temperature. This closed-loop design allows for efficient heating and cooling throughout the year, making the statement true.

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  • 47. 

    The main difference between troubleshooting a geothermal heat pump and an air-to-air heat pump is the method of obtaining needed temperatures.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The explanation for the correct answer is that a geothermal heat pump obtains needed temperatures from the ground, while an air-to-air heat pump obtains temperatures from the air. This difference in heat source affects the troubleshooting process, as issues related to the ground loop or underground piping may arise with geothermal heat pumps, whereas air-to-air heat pumps may encounter problems with the outdoor unit or air ducts. Therefore, the method of obtaining temperatures is a key factor in determining the troubleshooting approach for these two types of heat pumps.

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  • 48. 

    Not changing air filters can often cost more than the price of the filters.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Not changing air filters regularly can lead to a buildup of dust, dirt, and other particles in the HVAC system. This can restrict airflow and make the system work harder to maintain the desired temperature, resulting in higher energy consumption and increased utility bills. Additionally, clogged air filters can cause the system to overheat and potentially lead to expensive repairs or even the need for a replacement. Therefore, neglecting to change air filters can indeed end up costing more than the relatively low price of the filters themselves.

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  • 49. 

    Since the Earth's crust is cooler than the air during the summer, it can be used to accept air conditioning heat loads.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During the summer, the Earth's crust remains cooler than the air temperature. This temperature difference allows the Earth's crust to act as a heat sink, absorbing the excess heat from the air conditioning system. By using the Earth's crust as a heat source, the air conditioning system can efficiently transfer heat and cool the air indoors. Therefore, the statement is true.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 16, 2010
    Quiz Created by
    Azortex
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