Course outline
Module 1
Module 1: Plumbing Basics: Leaks, Drains, and Faucets
Plumbing Basics: Leaks, Drains, and Faucets
Knowledge check
Q1. What is the most common cause of a dripping faucet in a compression-style faucet?
- A. A clogged aerator
- B. A worn rubber washer or O-ring ✓
- C. Low water pressure in the main line
- D. A cracked faucet spout
Why: In compression faucets, the rubber washer seals the valve against the seat. Over time it wears out or hardens, allowing water to leak past and drip from the spout.
Q2. Before beginning any plumbing repair on a fixture, what should you do first?
- A. Call a licensed plumber immediately
- B. Turn off the water supply to that fixture ✓
- C. Remove the faucet handle with pliers
- D. Pour drain cleaner into the sink
Why: Shutting off the water supply, usually with the shutoff valves under the sink or the main shutoff, prevents flooding and protects you during the repair.
Q3. What is a P-trap's main purpose under a sink?
- A. To increase water pressure at the faucet
- B. To hold water that blocks sewer gases from entering the room ✓
- C. To filter out hair and debris
- D. To regulate hot water temperature
Why: The curved P-shape of the trap holds a small amount of standing water, which forms a seal that keeps foul-smelling sewer gases from rising into the living space.
Q4. Which tool is best suited for removing a stubborn clog in a sink drain that is not deep in the pipe?
- A. A pipe wrench
- B. A plunger ✓
- C. A hacksaw
- D. A tape measure
Why: A plunger creates pressure and suction that can dislodge clogs close to the drain opening. A pipe wrench and hacksaw are for loosening or cutting pipes, and a tape measure does not clear blockages.
Q5. Why should you avoid using chemical drain cleaners repeatedly on a clogged drain?
- A. They raise your water bill significantly
- B. They can damage pipes and harm septic systems while often failing to clear the clog ✓
- C. They make water taste metallic
- D. They cause faucets to stop working
Why: Harsh chemicals can corrode pipes, especially older or plastic ones, and can harm septic systems. They also may not fully clear the clog and can cause injury if they splash, so mechanical methods are often safer.
Module 2
Module 2: Electrical Safety: Outlets, Switches, and Breakers
Electrical Safety: Outlets, Switches, and Breakers
Knowledge check
Q1. What is the most important reason to turn off the breaker before replacing an electrical outlet?
- A. It makes the outlet easier to unscrew from the wall box
- B. It prevents electric shock by ensuring the wires you are touching carry no current ✓
- C. It keeps the nearby appliances from getting damaged by a power surge
- D. It is only required by building codes in some regions and is otherwise optional
Why: Turning off the correct breaker de-energizes the circuit so you can work on wires safely. Even a standard household outlet can deliver a dangerous, potentially fatal shock. Always verify the power is off with a voltage tester before touching any wires.
Q2. What does a GFCI outlet do?
- A. It increases the voltage available to appliances plugged into it
- B. It stores extra power during outages so devices keep running
- C. It shuts off power quickly when it detects current leaking to ground, such as through a person ✓
- D. It filters out electrical noise that causes interference with audio equipment
Why: A Ground Fault Circuit Interrupter compares current flowing out on the hot wire with current returning on the neutral wire. If a difference suggests current is leaking to ground, which can happen through water or a person, it trips in a fraction of a second. GFCIs are required near water sources like kitchens, bathrooms, and outdoors.
Q3. A breaker keeps tripping when you run a space heater and a hair dryer on the same circuit. What is the most likely cause?
- A. The breaker is defective and should be replaced immediately
- B. The circuit is overloaded because the combined current draw exceeds the breaker's rating ✓
- C. The outlets are wired backward and need to be swapped
- D. The neutral wire has been cut somewhere in the wall
Why: Breakers protect wiring by tripping when current exceeds their rating, commonly 15 or 20 amps. A space heater can draw around 12 to 15 amps alone, so adding a hair dryer overloads the circuit. The fix is to spread high-power devices across different circuits rather than replacing a working breaker.
Q4. Which of the following is a sign that an electrical outlet may be unsafe and needs professional attention?
- A. The outlet cover plate is slightly loose
- B. A plug fits in snugly and stays in place
- C. The outlet feels warm to the touch, or you notice scorch marks or a burning smell ✓
- D. The outlet has only two slots instead of three
Why: Warmth, discoloration, scorch marks, buzzing, or a burning smell at an outlet can indicate loose connections or overheating, which are fire hazards. Stop using the outlet, shut off its breaker, and have a licensed electrician inspect it. A loose cover plate is a minor issue, and a snug plug fit is actually a good sign.
Q5. What is the purpose of the switch on a standard wall light switch, and why should you always check the switch position with the power on?
- A. It controls the flow of current to the light, so turning it off breaks the circuit on the hot wire, but the wires in the box can still be live ✓
- B. It adjusts the brightness of the bulb, so it cannot fully turn power off
- C. It only controls the neutral wire, so the hot wire is always energized
- D. It stores charge that can be released when the switch is flipped
Why: A standard switch interrupts the hot wire to the light fixture, so the light goes off. However, the wires inside the switch box remain live when the switch is off, because the hot supply still reaches the switch. This is why you must shut off the breaker, not just the switch, before working on the switch itself.
Module 3
Module 3: HVAC Care: Filters and Seasonal Checkups
HVAC Care: Filters and Seasonal Checkups
Knowledge check
Q1. How often should a standard 1-inch residential furnace filter generally be checked or replaced?
- A. Once every 5 to 7 years
- B. Every 1 to 3 months, depending on use and conditions ✓
- C. Only when the system stops working
- D. Once a year, regardless of use
Why: Standard disposable filters collect dust and debris over time and should be checked monthly and replaced every 1 to 3 months. Homes with pets, allergies, or heavy use may need more frequent changes.
Q2. What is the main purpose of an HVAC air filter?
- A. To cool the air to a set temperature
- B. To add moisture to dry indoor air
- C. To trap dust and particles that could damage the system and reduce air quality ✓
- D. To increase the speed of airflow through the ducts
Why: Filters capture dust, hair, and other particles. This protects the blower motor and coil from buildup and helps keep indoor air cleaner.
Q3. Which of the following is a sign that your air filter may need to be replaced right away?
- A. The filter is a light gray color
- B. The system runs quietly
- C. Visible dust or dirt buildup, or reduced airflow from the vents ✓
- D. The filter has a small amount of lint on the edges
Why: A heavily clogged filter restricts airflow, causing the system to work harder, lose efficiency, and possibly overheat. Visible grime or weak airflow are clear signals to replace it.
Q4. Before a seasonal HVAC checkup, which safety step should you take when working near the unit?
- A. Leave the power on so you can test the fan
- B. Turn off power to the unit at the switch or breaker ✓
- C. Pour water over the outdoor unit to clean it
- D. Remove the access panels while the system is running
Why: Turning off power at the disconnect switch or breaker prevents electrical shock and injury from moving fan blades while you inspect or clean the system.
Q5. Why is it recommended to schedule HVAC maintenance both before summer and before winter?
- A. Systems only need service once every few years
- B. Manufacturers require visits only during extreme weather
- C. Cooling and heating systems each get heavy use in their season, so checking them before peak demand helps catch problems early ✓
- D. Technicians offer discounts only during spring and fall
Why: Seasonal checkups prepare the cooling system before hot weather and the heating system before cold weather, when they are most needed. Catching issues early improves efficiency and reduces the chance of breakdowns.
Module 4
Module 4: Roof, Gutters, and Exterior Protection
Roof, Gutters, and Exterior Protection
Knowledge check
Q1. What is the most common sign that a roof shingle has reached the end of its useful life?
- A. Slight discoloration from sun exposure
- B. Curling, cracking, or missing granules ✓
- C. A small amount of moss in shaded areas
- D. Minor dust accumulation on the surface
Why: Curling, cracking, and missing granules indicate the shingle's protective layers are breaking down, allowing water to penetrate beneath the roof covering. Slight discoloration, moss, and dust are generally cosmetic or maintenance issues rather than signs of failure.
Q2. How often should gutters generally be cleaned to prevent water damage?
- A. Once every ten years
- B. Only after a major storm
- C. At least twice a year, in spring and fall ✓
- D. Every month without exception
Why: Cleaning gutters at least twice a year, typically in spring and fall, removes leaves and debris that cause clogs and overflow. Homes surrounded by many trees may need more frequent cleaning, but twice a year is a sound baseline for most homes.
Q3. Why should downspouts direct water at least several feet away from a home's foundation?
- A. To give the yard a more natural look
- B. To keep water from pooling against the foundation and seeping into the basement or crawlspace ✓
- C. To increase the water pressure in the downspout
- D. To make it easier to collect rainwater for gardening
Why: Water discharged near the foundation can saturate the soil, leading to leaks, cracks, basement flooding, and foundation movement. Extending downspouts several feet away, often using extensions or splash blocks, helps keep water drained from the structure.
Q4. Which of the following is a good reason to inspect exterior caulking around windows and doors periodically?
- A. Caulk is decorative and fades over time
- B. Cracked or missing caulk allows water and air to enter the home ✓
- C. Caulk must be replaced every week to stay effective
- D. Caulk prevents insects from landing on the siding
Why: Caulk seals joints where materials meet, and when it cracks, shrinks, or pulls away, water can enter wall cavities and air leakage increases energy costs. Regular inspection and resealing as needed protect both the structure and efficiency.
Q5. What is a safe first step before climbing a ladder to inspect or clean a roof or gutters?
- A. Check that the ladder is on stable, level ground and that someone knows you are working ✓
- B. Climb quickly so you finish before the weather changes
- C. Stand on the top rung for better reach
- D. Skip the inspection and rely on binoculars from the yard
Why: Ladder falls are a leading cause of home maintenance injuries. Setting the ladder on firm, level ground, following the manufacturer's height and angle guidance, and having someone aware of your work reduces the risk of serious accidents.
Module 5
Module 5: Walls, Ceilings, and Patching Small Damage
Walls, Ceilings, and Patching Small Damage
Knowledge check
Q1. What is the first step when patching a small hole in drywall?
- A. Paint over the hole immediately
- B. Remove any loose or crumbling material around the hole ✓
- C. Fill the hole with caulk
- D. Cover the hole with duct tape
Why: Removing loose or crumbling drywall around the hole creates a clean, stable edge so the patch adheres properly and doesn't crack or bulge later.
Q2. For a small hole in drywall roughly the size of a quarter, which patching material is most appropriate?
- A. Wood glue
- B. Spackling compound ✓
- C. Concrete mix
- D. Silicone sealant
Why: Spackling compound is designed for filling small drywall imperfections. It is easy to spread, sands smoothly, and dries to a firm surface ready for paint.
Q3. Why should you apply a thin coat of spackle and let it dry before adding a second coat?
- A. A thick single coat is always stronger
- B. Thin coats dry evenly and reduce shrinking and cracking ✓
- C. Spackle only works when applied in multiple thin layers for color
- D. It prevents the paint from peeling later
Why: Thick layers of spackle can shrink and crack as they dry. Thin coats dry more evenly and uniformly, producing a smoother, more durable repair.
Q4. After the spackle is fully dry, what is the best way to smooth the patch?
- A. Scrub it with a wire brush
- B. Sand it lightly with fine-grit sandpaper ✓
- C. Soak it in water
- D. Hit it with a hammer to flatten it
Why: Light sanding with fine-grit sandpaper smooths the patch so it blends with the surrounding wall. Coarse sanding can damage the paper surface of the drywall.
Q5. Why is it important to prime a patched area before painting?
- A. Primer makes the wall waterproof forever
- B. Spackle absorbs paint differently, so primer helps create a uniform finish ✓
- C. Primer is required by building codes for all paint jobs
- D. Paint will not stick to any surface without primer
Why: Patched spots absorb paint at a different rate than the rest of the wall, which can show up as dull or mismatched areas. Primer evens out absorption so the final paint color looks consistent.
Module 6
Module 6: Appliance Upkeep: Fridge, Washer, and Dryer
Appliance Upkeep: Fridge, Washer, and Dryer
Knowledge check
Q1. How often should you clean the condenser coils on a refrigerator?
- A. Once every 5 to 10 years
- B. Every 6 to 12 months ✓
- C. Only when the fridge stops working
- D. Every week
Why: Dust and pet hair build up on the condenser coils over time, forcing the compressor to work harder. Cleaning them every 6 to 12 months improves efficiency and extends the fridge's life.
Q2. What is the main purpose of cleaning the lint filter in a dryer after every load?
- A. To make the drum spin faster
- B. To reduce the amount of detergent needed
- C. To prevent a fire hazard and improve drying efficiency ✓
- D. To keep clothes from wrinkling
Why: Lint is highly flammable and a major cause of dryer fires. A clogged filter also restricts airflow, making the dryer take longer to dry clothes and wasting energy.
Q3. Why should you leave the washing machine door or lid slightly open when it is not in use?
- A. To let the motor cool down faster
- B. To allow the drum and gasket to dry out and prevent mold and odors ✓
- C. To make it easier for children to access the machine
- D. To reduce noise during the next cycle
Why: Trapped moisture in the drum and rubber door seal encourages mold, mildew, and bad smells. Leaving the door ajar lets air circulate and keeps the machine fresh.
Q4. What is a good way to check whether your refrigerator door seal (gasket) is still working properly?
- A. Shine a flashlight at the seal and see if the light leaks through
- B. Close a dollar bill in the door and try to pull it out; if it slides out easily, the seal is weak ✓
- C. Press your hand against the seal and feel for warmth
- D. Listen for a whistling sound when the door closes
Why: The dollar bill test is a simple check. If the paper slides out with little resistance, the magnetic gasket is no longer sealing tightly, which causes the fridge to lose cold air and work harder.
Q5. Which practice helps a washing machine last longer and perform better?
- A. Overloading the drum so fewer loads are needed
- B. Using the hot water setting for every load regardless of fabric
- C. Using only the recommended amount of detergent and running a monthly cleaning cycle ✓
- D. Always adding extra fabric softener to every wash
Why: Too much detergent leaves residue that builds up and can cause odors and mechanical problems. Using the right amount and periodically running a cleaning cycle or hot empty wash keeps the machine clean and efficient.
Module 7
Module 7: Home Safety: Smoke Alarms, Fire Extinguishers, and Emergency Prep
Home Safety: Smoke Alarms, Fire Extinguishers, and Emergency Prep
Knowledge check
Q1. How often should you test your smoke alarms?
- A. Once a year
- B. Once a month ✓
- C. Once every five years
- D. Only after a fire occurs
Why: Smoke alarms should be tested monthly by pressing the test button to confirm the battery and horn are working. Regular testing catches problems early, before an emergency.
Q2. How often should smoke alarm batteries be replaced if you use a standard battery-powered alarm?
- A. Every 10 years
- B. Every 6 months
- C. Only when the alarm stops working ✓
- D. Every 2 years
Why: Many guidelines recommend replacing batteries at least once a year, or as soon as the low-battery chirp sounds. Waiting until the alarm fails leaves your home unprotected, so proactive replacement is advised.
Q3. What does the PASS technique stand for when using a fire extinguisher?
- A. Pull, Aim, Squeeze, Sweep ✓
- B. Push, Action, Spray, Stop
- C. Point, Activate, Stop, Seal
- D. Pull, Activate, Spray, Store
Why: PASS stands for Pull the pin, Aim the nozzle at the base of the fire, Squeeze the handle, and Sweep from side to side. Following these steps helps you use the extinguisher effectively.
Q4. Which type of fire extinguisher is suitable for most common household fires, including wood, paper, and cloth?
- A. Class A ✓
- B. Class B
- C. Class C
- D. Class D
Why: Class A extinguishers are designed for ordinary combustibles such as wood, paper, and cloth. Class B handles flammable liquids, Class C handles electrical fires, and Class D handles combustible metals.
Q5. If a fire is spreading quickly in your home, what should you do first?
- A. Try to gather valuables before leaving
- B. Get everyone out and call emergency services from outside ✓
- C. Open all windows to let the smoke out
- D. Search the house to confirm everyone is accounted for
Why: Your life is worth more than property, so the priority is getting everyone out quickly and calling emergency services from a safe location. Opening doors and windows can feed the fire, and going back inside risks injury.