Maintenance Test Questions With Answers

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Maintenance Test Questions With Answers - Quiz

Are you ready to put your house maintenance knowledge to the test? Not everyone has the skills to tackle household maintenance issues, but if you're capable, you may consider obtaining a license to practice through a comprehensive exam. Are you preparing to take your exams? Take our quiz and assess your readiness. Explore questions on various aspects of house maintenance, from plumbing and electrical work to general repairs and troubleshooting. Discover how well-prepared you are to handle household tasks like a pro. So, let's dive in and see if you're ready to ace your house maintenance exams!


Questions and Answers
  • 1. 

    On a 110-volt circuit, the hot wire is normally:

    • A.

      White

    • B.

      Black or Red

    • C.

      Green or bare wire

    • D.

      Yellow

    Correct Answer
    B. Black or Red
    Explanation
    On a 110-volt circuit, the hot wire is normally black or red. This is because black or red wires are typically used to carry the live or current-carrying conductor in electrical circuits. The hot wire carries the electrical current from the power source to the electrical device or appliance. The color coding of wires helps to identify and distinguish between different types of wires in a circuit, ensuring proper and safe electrical connections.

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  • 2. 

    What is the purpose of a squirrel cage?

    • A.

      To move air through the handler.

    • B.

      To cool circulation pump.

    • C.

      None of the above

    • D.

      All of the above

    Correct Answer
    A. To move air through the handler.
    Explanation
    The purpose of a squirrel cage is to move air through the handler. This is typically done in HVAC systems, where the squirrel cage fan is used to circulate air and maintain proper air flow throughout the system. It helps to distribute the conditioned air to different areas and maintain a comfortable temperature in the space being served.

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  • 3. 

    Quality of tools may reflect the quality of work.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement suggests that the quality of the tools used can be an indication of the quality of work produced. This means that if someone uses high-quality tools, it is likely that they will produce high-quality work. On the other hand, if someone uses low-quality tools, it is more likely that their work will be of lower quality. Therefore, the answer "True" is correct as it aligns with the statement provided.

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  • 4. 

    Where is a fuse link located?

    • A.

      In a fuse box

    • B.

      On a heat coil

    • C.

      On a stove element

    • D.

      None of the above

    Correct Answer
    B. On a heat coil
    Explanation
    A fuse link is located on a heat coil. This is because a fuse link is a safety device that is designed to protect the heat coil from overheating and causing a fire. When the heat coil reaches a certain temperature, the fuse link will melt, breaking the electrical circuit and preventing further heating. This helps to prevent damage to the heat coil and potential fire hazards.

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  • 5. 

    Where is a joist found?

    • A.

      Floor

    • B.

      Wall

    • C.

      Stair

    • D.

      Corner

    Correct Answer
    A. Floor
    Explanation
    A joist is typically found in the floor of a building. It is a horizontal structural member that provides support and stability to the floor above. Joists are commonly made of wood or steel and are spaced apart to distribute the weight of the floor and any loads placed on it. They are an essential component of the floor framing system and play a crucial role in maintaining the structural integrity of the building.

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  • 6. 

    On most garbage disposals, where is the reset button located?

    • A.

      In the breaker box

    • B.

      On the outlet nearest the disposal

    • C.

      On the bottom of the disposal

    • D.

      On the nearest wall

    Correct Answer
    C. On the bottom of the disposal
    Explanation
    The reset button on most garbage disposals is located on the bottom of the disposal. This is where you can easily access and press the button to reset the disposal in case it gets jammed or stops working.

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  • 7. 

    A copy of the service request should be left in every occupied apartment after completion to let the resident know what service has been completed.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Leaving a copy of the service request in every occupied apartment after completion is a good practice to inform the resident about the service that has been completed. This helps in maintaining transparency and ensuring that the resident is aware of the work that has been done. It also serves as a record for both the resident and the service provider. Therefore, the statement is true.

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  • 8. 

    Why should you pull a vacuum?

    • A.

      Check for leaks

    • B.

      Remove impurities

    • C.

      Extend the life of the unit

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Pulling a vacuum is necessary for multiple reasons. Firstly, it allows you to check for leaks in the system, ensuring that there are no air or gas leaks that could affect its performance. Secondly, it helps to remove impurities such as moisture, dirt, or contaminants that may be present in the system, which can improve its efficiency and prevent damage. Lastly, pulling a vacuum can help extend the life of the unit by creating a clean and stable environment, reducing the risk of corrosion or other issues. Therefore, all of the above reasons justify the need to pull a vacuum.

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  • 9. 

    What kind of Freon would you suggest for use in an apartment freezer?

    • A.

      R 12

    • B.

      R 22

    • C.

      R 302

    • D.

      R 202

    Correct Answer
    A. R 12
    Explanation
    R 12 is the correct answer because it is the most commonly used type of Freon for household refrigeration systems, including apartment freezers. It has good cooling properties and is compatible with most freezer units. R 22 is another type of Freon commonly used in air conditioning systems but is not recommended for use in freezers. R 302 and R 202 are not commonly used types of Freon and are not suitable for use in apartment freezers.

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  • 10. 

    Older refrigerators contain which type of Freon:

    • A.

      R 22

    • B.

      R 12

    • C.

      R 502

    • D.

      R 602

    Correct Answer
    B. R 12
    Explanation
    Older refrigerators contain R 12 as the type of Freon.

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  • 11. 

    Where is the bibb seat located?

    • A.

      In a faucet

    • B.

      On a toilet

    • C.

      None of the above

    • D.

      All of the above

    Correct Answer
    A. In a faucet
    Explanation
    The bibb seat is located in a faucet.

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  • 12. 

    As the hot water heater tank is being filled up, you should:

    • A.

      Clean it up

    • B.

      Flush the toilet

    • C.

      Purge the tank of air

    • D.

      None of the above

    Correct Answer
    C. Purge the tank of air
    Explanation
    When filling up a hot water heater tank, it is important to purge the tank of air. This is because air can become trapped in the tank, which can cause problems with the heating system and decrease the efficiency of the heater. Purging the tank of air ensures that the hot water heater functions properly and efficiently.

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  • 13. 

    What kind of freon is used in central air conditioning?

    • A.

      R 12

    • B.

      R 11

    • C.

      R 22

    • D.

      R 21

    Correct Answer
    C. R 22
    Explanation
    R 22 is the correct answer because it is the most commonly used freon in central air conditioning systems. It is a hydrochlorofluorocarbon (HCFC) refrigerant that has good cooling properties and is compatible with the materials used in most air conditioning systems. R 12, R 11, and R 21 are not commonly used in central air conditioning and are typically used in other types of refrigeration systems.

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  • 14. 

    Taking heat out of the air will do what to the air temperature?

    • A.

      Raise

    • B.

      Lower

    • C.

      Stabilize

    • D.

      None of the above

    Correct Answer
    B. Lower
    Explanation
    When heat is taken out of the air, it means that the air is being cooled down. Therefore, the temperature of the air will be lowered.

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  • 15. 

    When charging, vapor should be added to the ____ side of the compressor.

    • A.

      High

    • B.

      Low

    • C.

      Liquid

    • D.

      Left

    Correct Answer
    B. Low
    Explanation
    When charging, vapor should be added to the low side of the compressor. This is because the low side of the compressor is where the refrigerant enters the compressor in a gaseous state. By adding vapor to the low side, it helps to maintain the proper pressure and temperature levels in the system, ensuring efficient operation of the compressor and the overall refrigeration system. Adding vapor to the high side or liquid side could disrupt the balance of the system and potentially cause damage.

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  • 16. 

    R-134A is a drop in replacement for R-12.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    R-134A is not a drop-in replacement for R-12. While both are refrigerants, they have different properties and cannot be used interchangeably. R-134A is commonly used as a replacement for R-12 in automotive air conditioning systems, but it requires modifications to the system in order to work properly. Therefore, the correct answer is False.

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  • 17. 

    What is the best product to use to thin or clean up latex paint?

    • A.

      Varsal

    • B.

      Water

    • C.

      Paint thinner

    • D.

      Turpentine

    Correct Answer
    B. Water
    Explanation
    Water is the best product to use to thin or clean up latex paint. Latex paint is water-based, so using water to thin it or clean up any spills or brushes is the most effective and safe option. Varsal, paint thinner, and turpentine are all solvents that are typically used to thin or clean up oil-based paints, not latex paints. Using these solvents on latex paint can cause damage or produce undesirable results. Therefore, water is the recommended choice for thinning or cleaning up latex paint.

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  • 18. 

    Low voltage means:

    • A.

      Less than 220 volts

    • B.

      Less than 460 volts

    • C.

      110 volt

    • D.

      Less than 30 volts (usually 24)

    Correct Answer
    D. Less than 30 volts (usually 24)
    Explanation
    Low voltage refers to a voltage level that is below a certain threshold. In this case, the correct answer is "Less than 30 volts (usually 24)". This means that when the voltage is below 30 volts, it is considered low voltage, with the typical value being around 24 volts.

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  • 19. 

    Picking up litter on the property is every employee's business; there are no exceptions.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    This statement implies that it is the responsibility of every employee to pick up litter on the property, and there are no exceptions to this rule. This means that regardless of an employee's position or role within the organization, they are expected to contribute to keeping the property clean by picking up litter. Therefore, the correct answer is True.

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  • 20. 

    When wiring a new wall receptacle, the silver screw is for:

    • A.

      Ground wire

    • B.

      Neutrel Wire

    • C.

      Hot wire

    • D.

      None of the above

    Correct Answer
    B. Neutrel Wire
    Explanation
    The silver screw is used for connecting the neutral wire when wiring a new wall receptacle. The neutral wire carries the current back to the source and completes the electrical circuit. It is typically color-coded white and is an essential component for the safe operation of the receptacle.

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  • 21. 

    Apartment #2 is underneath Apartment #12. The occupants in #2 say that water is coming into their bathroom through the overhead vent every time the residents upstairs take a shower.  What is the probable cause?

    • A.

      Shower drain pipe is leaking

    • B.

      No shower curtain in apt #12

    • C.

      Leak in the pipe between the director and showerhead

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The probable cause for water coming into Apartment #2's bathroom through the overhead vent when the residents upstairs take a shower is that there is a combination of issues. The shower drain pipe may be leaking, allowing water to escape and flow downwards. Additionally, the absence of a shower curtain in Apartment #12 could result in water spraying out of the shower and onto the floor, which then seeps through the vent. Lastly, there may be a leak in the pipe between the showerhead and the water director, causing water to escape and reach the vent.

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  • 22. 

    What is a swagging tool used for?

    • A.

      Enlarging copper tubing

    • B.

      Connecting PVC pipe joints

    • C.

      Joining electrical wires

    • D.

      None of the above

    Correct Answer
    A. Enlarging copper tubing
    Explanation
    A swagging tool is used for enlarging copper tubing. This tool is specifically designed to expand the diameter of copper tubing, allowing for a better fit and connection between pipes or fittings. It is commonly used in plumbing and HVAC systems to create a tight seal and prevent leaks. Swagging tools are not used for connecting PVC pipe joints or joining electrical wires.

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  • 23. 

    What is one purpose of shutoff valves on the compressor during installation and when servicing?

    • A.

      Too allow you to overheat the compressor to check for leaks

    • B.

      Too allow the freon to be saved while servicing the unit

    • C.

      Too regulate or shut-off electrical current to the condensor

    • D.

      None of the above

    Correct Answer
    B. Too allow the freon to be saved while servicing the unit
    Explanation
    Shutoff valves on the compressor during installation and servicing allow the freon to be saved. By shutting off the valves, the flow of freon can be stopped, preventing any loss or leakage of the refrigerant during maintenance or repair work. This helps in conserving the freon and ensuring its availability for future use.

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  • 24. 

    The pilot light on a standing pilot water heater won't stay lit. What might be causing the problem?

    • A.

      The ignitor

    • B.

      The thermocouple

    • C.

      The theromostat

    • D.

      None of the above

    Correct Answer
    B. The thermocouple
    Explanation
    The thermocouple is a device that senses the heat from the pilot light and generates a small electric current to keep the gas valve open. If the thermocouple is faulty or not positioned correctly, it may not be generating enough current to keep the gas valve open, causing the pilot light to go out.

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  • 25. 

    How many BTUs are in a ton?

    • A.

      16000

    • B.

      10000

    • C.

      12000

    • D.

      None of the above

    Correct Answer
    C. 12000
    Explanation
    A BTU (British Thermal Unit) is a unit of energy commonly used in the heating and cooling industry. A ton is a unit of measurement used to quantify the cooling capacity of an air conditioning system. In this context, a ton refers to the amount of heat energy needed to melt one ton of ice in a 24-hour period. It is equal to 12,000 BTUs per hour, which means that the correct answer is 12,000.

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  • 26. 

    Service requests should be filled out completely and signed before returning to the manager or office staff.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    It is important to fill out service requests completely and sign them before returning them to the manager or office staff. This ensures that all necessary information is provided and helps in maintaining a record of the request. By signing the form, the person acknowledges their responsibility for the request and provides consent for the requested service. Therefore, the statement "Service requests should be filled out completely and signed before returning to the manager or office staff" is true.

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  • 27. 

    When working on a defective breaker, what is the first thing you should do?

    • A.

      Remove the breaker

    • B.

      Shut-off the breaker

    • C.

      Turn off the main line breaker

    • D.

      None of the above

    Correct Answer
    C. Turn off the main line breaker
    Explanation
    The first thing you should do when working on a defective breaker is to turn off the main line breaker. This is important to ensure your safety and prevent any potential electrical accidents. By turning off the main line breaker, you are cutting off the power supply to the entire electrical system, including the defective breaker. This allows you to work on the breaker without the risk of electrical shock or other hazards. Removing the breaker or shutting it off alone may not be sufficient to ensure your safety, as there may still be live electricity flowing through the system.

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  • 28. 

    In roofing, a square (measurement) is an area of:

    • A.

      1 ft x 1 ft

    • B.

      10 ft x 10 ft

    • C.

      100 ft x 100 ft

    • D.

      None of the above

    Correct Answer
    B. 10 ft x 10 ft
    Explanation
    A square in roofing measurement refers to an area of 10 ft x 10 ft. This means that the length and width of the square are both 10 feet. This measurement is commonly used in roofing to calculate the total area that needs to be covered or repaired. It is important to understand this measurement in order to accurately estimate materials and costs for roofing projects.

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  • 29. 

    Algae are microscopic plant life.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Algae are microscopic plant life because they are photosynthetic organisms that contain chlorophyll and can produce their own food through photosynthesis. They are typically found in aquatic environments and can range in size from single-celled organisms to large seaweeds. Algae play a crucial role in the ecosystem by producing oxygen and serving as a food source for other organisms.

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  • 30. 

    Most gas water heaters have two (2) regulators. The one on the meter should be adjusted only by the utility company.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Gas water heaters typically have two regulators: one on the meter and one on the heater itself. The regulator on the meter is typically adjusted and maintained by the utility company, as it controls the flow of gas to the entire property. It is important for the utility company to have control over this regulator to ensure the safe and efficient operation of the gas supply. Therefore, the statement that the regulator on the meter should only be adjusted by the utility company is true.

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  • 31. 

    If a dishwasher hums, but the motor will not run, the probable cause is:

    • A.

      The fill valve solenoid is malfunctioning

    • B.

      The seal is frozen

    • C.

      The timer is malfunctioning

    • D.

      The wrong type of soap was added

    Correct Answer
    B. The seal is frozen
    Explanation
    If a dishwasher hums but the motor will not run, the probable cause is that the seal is frozen. When the seal is frozen, it prevents the motor from running properly, resulting in the dishwasher only humming.

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  • 32. 

    Muriatic acid is used to ____ the pH level in a pool.

    • A.

      Raise

    • B.

      Lower

    • C.

      Stabilize

    • D.

      None of the above

    Correct Answer
    B. Lower
    Explanation
    Muriatic acid is a strong acid that is commonly used to lower the pH level in a pool. pH level refers to the acidity or alkalinity of the water, and maintaining the proper pH level is important for the effectiveness of pool chemicals and the comfort of swimmers. Adding muriatic acid to the pool water helps to decrease the pH level and make it more acidic, balancing out any high alkalinity. Therefore, the correct answer is "Lower."

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  • 33. 

    Never mix two pool maintenance chemicals together.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Mixing two pool maintenance chemicals together can be extremely dangerous. Certain combinations can create toxic fumes or even cause explosions. It is important to always follow the instructions on the chemical labels and never mix them unless specifically directed to do so.

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  • 34. 

    Most residential wiring is three phase.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Most residential wiring is not three phase. Residential buildings typically use single-phase electrical systems, where the power is distributed through two wires - a live wire and a neutral wire. Three-phase electrical systems are more commonly used in commercial and industrial settings, where higher power demands are required.

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  • 35. 

    On which appliance would you find a hot wire relay?

    • A.

      Stove

    • B.

      Refrigerator

    • C.

      Dishwasher

    • D.

      Hot water heater

    Correct Answer
    B. Refrigerator
    Explanation
    A hot wire relay is a component that is used to control the flow of electricity to a specific part of an appliance. In the case of a refrigerator, a hot wire relay may be found in the compressor circuit, which is responsible for cooling the refrigerator. This relay helps to regulate the power supply to the compressor, ensuring that it operates efficiently and safely.

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  • 36. 

    Where do you find a flapper?

    • A.

      In a dishwasher

    • B.

      In a toilet tank

    • C.

      In a water heater

    • D.

      In a oven

    Correct Answer
    B. In a toilet tank
    Explanation
    A flapper is a rubber valve that is found in a toilet tank. It is attached to the flush valve and is responsible for controlling the flow of water from the tank into the toilet bowl. When the toilet is flushed, the flapper lifts up, allowing water to flow into the bowl, and then closes again to stop the water flow. Therefore, the correct answer is "In a toilet tank."

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  • 37. 

    Which process uses Pentrox Solution?

    • A.

      Aluminum to copper connections

    • B.

      PVC pipe connections

    • C.

      Cleaning ground wires

    • D.

      All of the above

    Correct Answer
    A. Aluminum to copper connections
    Explanation
    Pentrox Solution is used for aluminum to copper connections.

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  • 38. 

    A sequencer is used in:

    • A.

      Heating and air conditioning

    • B.

      Plumbing

    • C.

      Outside lighting

    • D.

      None of the above

    Correct Answer
    A. Heating and air conditioning
    Explanation
    A sequencer is a device that is used to control the timing and sequencing of different components in a system. In the case of heating and air conditioning systems, a sequencer is used to control the operation of the various heating and cooling elements, such as the furnace, heat pump, and air conditioner. It ensures that these components are activated in the correct order and for the appropriate duration to maintain the desired temperature in the building. Therefore, the correct answer is heating and air conditioning.

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  • 39. 

    An iced up evaporator is usually a sign of insufficient air through the evaporator coils or:

    • A.

      Low charge

    • B.

      High charge

    • C.

      None of the above

    • D.

      All of the above

    Correct Answer
    A. Low charge
    Explanation
    An iced up evaporator is usually a sign of low charge. When there is insufficient refrigerant in the system, the evaporator coils do not receive enough heat to properly evaporate the refrigerant. This causes the coils to become excessively cold and ice to form on them. High charge or none of the above would not result in the same issue of an iced up evaporator.

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  • 40. 

    A resident calls and complains that soap bubbles run out of the dishwasher when she runs it.  A probable cause is:

    • A.

      The drain is clogged

    • B.

      The resident used hand dishwashing soap instead of automatic dishwashing soap

    • C.

      Thd dishwasher is to full

    • D.

      All of the above

    Correct Answer
    B. The resident used hand dishwashing soap instead of automatic dishwashing soap
    Explanation
    The most probable cause for soap bubbles running out of the dishwasher is that the resident used hand dishwashing soap instead of automatic dishwashing soap. Hand dishwashing soap creates more suds than automatic dishwashing soap, which can cause an overflow of bubbles in the dishwasher. The other options, such as a clogged drain or the dishwasher being too full, may also contribute to the issue but are less likely to be the primary cause.

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  • 41. 

    When should a pool filter be backwashed?

    • A.

      Everyday

    • B.

      When the water starts to look milky

    • C.

      According to the pressure

    • D.

      Monthly

    Correct Answer
    C. According to the pressure
    Explanation
    A pool filter should be backwashed according to the pressure because the pressure in the filter increases as debris and dirt accumulate. When the pressure reaches a certain level, it indicates that the filter is becoming clogged and is no longer effectively filtering the water. Backwashing is necessary to remove the accumulated debris and restore the filter's efficiency. Backwashing daily or monthly may not be necessary if the pressure has not reached the designated level.

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  • 42. 

    What is the purpose of a breaker in an electrical circuit?

    • A.

      To route electrical currents

    • B.

      Overload protection

    • C.

      All of the above

    • D.

      None of the above

    Correct Answer
    B. Overload protection
    Explanation
    A breaker in an electrical circuit serves the purpose of overload protection. It is designed to automatically interrupt the flow of electrical current when it exceeds the safe limit. This helps prevent damage to the circuit and appliances, as well as reducing the risk of electrical fires. By tripping the breaker, it effectively stops the flow of current and protects the circuit from overloading. Therefore, the correct answer is "Overload protection".

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  • 43. 

    If you must leave a resident's apartment while in the middle of a repair project, leave your tools behind so that you may get back to work quickly upon your return.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Leaving your tools behind while in the middle of a repair project is not a good idea because it can lead to theft or damage to the tools. It is important to always secure your tools and take them with you when leaving a resident's apartment. This ensures that you can continue working efficiently and also prevents any potential loss or damage to your tools.

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  • 44. 

    What is an air diffuser?

    • A.

      Part of a strip heat

    • B.

      A vent with an open/shut control

    • C.

      None of the above

    • D.

      All of the above

    Correct Answer
    B. A vent with an open/shut control
    Explanation
    An air diffuser is a vent with an open/shut control. It is used to control the flow of air in a room or space by allowing the user to adjust the amount of air that is released or blocked. This helps in regulating the temperature, air circulation, and distribution in a building. A strip heat and "none of the above" are not accurate descriptions of an air diffuser.

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  • 45. 

    For safety reasons, you should never go up on a roof while there is dew on the ground.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Dew on the ground can make the surface slippery, increasing the risk of accidents and falls. Going up on a roof in such conditions can be dangerous as it can lead to loss of balance and potential injuries. It is important to wait for the ground to dry before attempting to go up on a roof to ensure safety.

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  • 46. 

    How long is a recovery tank inspection good?

    • A.

      1 year

    • B.

      5 years

    • C.

      10 years

    • D.

      15 years

    Correct Answer
    B. 5 years
    Explanation
    A recovery tank inspection is good for 5 years. This means that after a recovery tank has been inspected and deemed safe, it is considered to be in compliance for a period of 5 years. After this time, the tank would need to be inspected again to ensure its continued safety and compliance.

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  • 47. 

    On a 220-volt circuit, where the white wire is common, the red wire is normally ______.

    • A.

      24 volts

    • B.

      110 volts

    • C.

      220 volts

    • D.

      210 volts

    Correct Answer
    B. 110 volts
    Explanation
    In a 220-volt circuit where the white wire is common, the red wire is normally carrying 110 volts. This is because in a standard electrical circuit, the voltage is divided between the hot wire (red wire in this case) and the neutral wire (white wire in this case). In a 220-volt circuit, the voltage is split evenly between the two wires, resulting in 110 volts on the red wire.

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  • 48. 

    The condenser is part of the:

    • A.

      High side

    • B.

      Low Side

    • C.

      Neither

    • D.

      None of the above

    Correct Answer
    A. High side
    Explanation
    The condenser is part of the high side of a refrigeration system. The high side is the section of the system where the high-pressure, high-temperature refrigerant gas is condensed into a liquid. The condenser receives the hot refrigerant gas from the compressor and cools it down, causing it to condense into a liquid. This liquid refrigerant then flows to the expansion valve and enters the low side of the system. Therefore, the condenser is not part of the low side or any other part of the system.

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  • 49. 

    What causes the burner flame on a gas stove to be yellow?

    • A.

      High gas pressure

    • B.

      Too much air in the flame

    • C.

      Not enough air in the flame

    • D.

      All of the above

    Correct Answer
    C. Not enough air in the flame
    Explanation
    The burner flame on a gas stove turns yellow when there is not enough air in the flame. This can happen when the air intake is blocked or restricted, preventing enough oxygen from reaching the flame. As a result, incomplete combustion occurs, leading to a yellow flame instead of the desired blue flame.

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  • 50. 

    Three letters on compressor blocks are:

    • A.

      D O A

    • B.

      C S R

    • C.

      B T U

    • D.

      B T R

    Correct Answer
    B. C S R
    Explanation
    The correct answer is CSR. This can be determined by comparing the letters in each row and finding the pattern. In the first row, the letters are in alphabetical order. In the second row, the letters are in reverse alphabetical order. In the third row, the letters are in alphabetical order again. Therefore, the pattern suggests that the missing letters in the fourth row should be CSR.

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