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PEI Class 7 Test practice questions

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Question 1Safety and Environmental Regulations

Under Prince Edward Island's boating safety rules, what is the minimum age at which a person may operate a pleasure craft fitted with an engine of 10 hp (7.5 kW) or more without direct supervision?

  1. 14 years
  2. 16 years Correct answer.
  3. 18 years
  4. 12 years

Explanation

Operators of motorized pleasure craft with engines of 10 hp (7.5 kW) or more must be at least 16 years old to operate unsupervised. Younger operators may run such craft only under the direct supervision of a qualified adult. This age threshold mirrors the federal competency requirement for powered recreational vessels.

Question 2Safety and Environmental Regulations

What is the primary purpose of the Canadian boating safety course and Pleasure Craft Operator Card?

  1. To demonstrate basic boating safety knowledge and competency Correct answer.
  2. To register the hull with Transport Canada
  3. To license the vessel itself for use on provincial waters
  4. To certify the operator as a commercial fishing captain

Explanation

The Pleasure Craft Operator Card is proof that the holder has passed a Transport Canada accredited boating safety course. It demonstrates basic competency in safe operation, not vessel licensing, registration, or commercial certification. Registration and licensing are separate administrative processes.

Question 3Safety and Environmental Regulations

When operating a pleasure craft in PEI waters, which item is legally required safety equipment on board?

  1. A properly fitted personal flotation device for each person on board Correct answer.
  2. A GPS chartplotter
  3. A marine VHF radio
  4. A spare propeller

Explanation

Every pleasure craft must carry a personal flotation device or lifejacket of appropriate size for each person aboard. VHF radios, GPS units, and spare propellers are useful but are not universally mandated for all craft. The PFD requirement is the fundamental carriage rule.

Question 4Safety and Environmental Regulations

How many approved lifejackets or personal flotation devices must be carried on a pleasure craft?

  1. One per two persons on board
  2. One per adult only
  3. One for each person on board Correct answer.
  4. Only for children under 12

Explanation

Regulations require one approved PFD or lifejacket of appropriate size for every person on board the craft. Carrying fewer leaves occupants without legally mandated flotation. Children require appropriately sized devices as well.

Question 5Safety and Environmental Regulations

What does a red buoy with a cylindrical shape generally indicate to a boater?

  1. A port-hand marker to keep on the left when returning from sea
  2. A hazard to be passed on either side
  3. A swimming area boundary
  4. A starboard-hand marker to keep on the right when returning from sea Correct answer.

Explanation

In the IALA-B system used in Canada, red can buoys mark the starboard side of a channel when returning from sea. Boaters keep these markers to their right in the direction of travel. Green buoys mark the port side.

Question 6Safety and Environmental Regulations

What should the operator do first when a person falls overboard?

  1. Immediately increase speed to circle back
  2. Turn off the engine and wait for rescue
  3. Throw all loose gear overboard to lighten the craft
  4. Shout 'man overboard', keep the person in sight, and slow or stop the vessel Correct answer.

Explanation

The immediate response is to alert others, maintain visual contact with the person in the water, and reduce speed to avoid striking them. Maneuvering back is done carefully after the person is spotted. Losing sight of the person is the greatest danger.

Question 7Safety and Environmental Regulations

Which action best reduces the risk of carbon monoxide poisoning on a pleasure craft?

  1. Storing fuel in the cabin
  2. Keeping exhaust outlets clear and avoiding idling near swim platforms Correct answer.
  3. Closing all ventilation hatches while cruising
  4. Running the engine only at high speed

Explanation

Carbon monoxide is colourless and odourless, so prevention relies on keeping exhaust outlets unobstructed and avoiding prolonged idling where exhaust can accumulate. Never block ventilation or swim near the exhaust with the engine running. Fuel should never be stored in the cabin.

Question 8Safety and Environmental Regulations

What is the purpose of the pollution prevention regulations that apply to pleasure craft?

  1. To control the number of boats on a lake
  2. To prevent discharge of oil, garbage, and sewage into the water Correct answer.
  3. To limit engine noise on inland lakes
  4. To require registration of all canoes

Explanation

Pollution prevention rules prohibit discharging oil, garbage, and untreated sewage into Canadian waters. These regulations protect water quality and aquatic habitat. Noise, boat counts, and canoe registration are governed by other rules or not at all.

Question 9Safety and Environmental Regulations

A boater plans to anchor overnight in a PEI bay. Which practice best protects the marine environment?

  1. Discharging holding tank contents before settling for the night
  2. Running the engine continuously to charge batteries
  3. Anchoring directly over eelgrass beds to secure a firm hold
  4. Choosing a sandy bottom away from sensitive vegetation and using a proper anchor Correct answer.

Explanation

Anchoring over sand away from eelgrass and other sensitive habitats prevents physical damage to vegetation. Eelgrass beds are important nursery habitat and are easily scarred by anchors. Discharging untreated sewage and unnecessary engine running also harm water quality.

Question 10Safety and Environmental Regulations

Which of the following best describes the correct procedure for fueling a pleasure craft at a marina?

  1. Stop the engine, extinguish all flames, and avoid overfilling the tank Correct answer.
  2. Fill the tank to the brim to maximize range
  3. Leave the engine running to speed the process
  4. Fuel while smoking only if the wind is calm

Explanation

Safe fueling requires the engine off, no ignition sources, and careful filling to avoid overflow. Fuel expands and spilled fuel is both a fire hazard and a pollutant. Smoking or open flames near fueling are prohibited.

Question 11Safety and Environmental Regulations

A vessel is approaching a swimming area marked with buoys. What is the operator's legal obligation?

  1. Anchor inside the marked area
  2. Reduce speed and keep clear of the marked area Correct answer.
  3. Sound the horn continuously
  4. Maintain planing speed to pass quickly

Explanation

Operators must slow down and stay clear of marked swimming areas to protect swimmers. Wake and propeller strikes are serious hazards in these zones. Entering or speeding through a marked swim area is unsafe and unlawful.

Question 12Safety and Environmental Regulations

What is the minimum recommended safety action when severe weather is forecast during a planned boat trip?

  1. Reduce the number of lifejackets to save weight
  2. Postpone or cancel the trip until conditions improve Correct answer.
  3. Travel farther offshore to avoid waves
  4. Depart as planned and monitor the radio

Explanation

Checking forecasts before departure and postponing when severe weather is predicted is the safest choice. Small craft are vulnerable to sudden storms and high winds. Going offshore in bad weather increases risk rather than reducing it.

Question 13Safety and Environmental Regulations

Which of the following is a required item on a pleasure craft to help respond to a fire?

  1. No equipment is required for small craft
  2. A fire blanket in the galley only
  3. A fire extinguisher of the type and size appropriate to the craft Correct answer.
  4. A bucket of sand only

Explanation

Pleasure craft of certain lengths and types must carry an approved fire extinguisher appropriate to the vessel. Fire on the water spreads quickly and professional help may be far away. Sand or blankets alone do not satisfy the carriage requirement.

Question 14Safety and Environmental Regulations

What number should a boater call to reach marine emergency services in Canadian waters?

  1. 911 only
  2. The local marina office
  3. *16 or VHF channel 16 Correct answer.
  4. 1-800-555-0000

Explanation

Marine emergencies in Canada are reported through *16 on a cellular phone or VHF channel 16, which is monitored for distress calls. These connect to the Joint Rescue Coordination Centre. A marina office is not an emergency service.

Question 15Safety and Environmental Regulations

What is the purpose of a float plan left with a responsible person ashore?

  1. To tell someone where you are going and when to expect your return Correct answer.
  2. To register the vessel with Transport Canada
  3. To obtain a mooring permit
  4. To satisfy insurance requirements only

Explanation

A float plan informs a trusted person of the vessel's route, occupants, and expected return time so rescuers can be alerted if the boat is overdue. It is a safety practice, not a registration or permit document. It significantly shortens search response time.

Question 16Safety and Environmental Regulations

A pleasure craft operator notices a sheen of oil on the water near the boat. What is the appropriate action?

  1. Continue operating normally
  2. Ignore it because small spills evaporate
  3. Report the spill to the appropriate environmental authority Correct answer.
  4. Pour detergent on it to disperse it

Explanation

Oil spills, even small ones, must be reported to environmental authorities so they can assess and contain the pollution. Adding detergent is itself a pollutant and is prohibited. Ignoring a spill allows it to spread and harm wildlife.

Question 17Safety and Environmental Regulations

Which statement about discharging garbage from a pleasure craft is correct?

  1. Glass sinks, so it may be discharged offshore
  2. Only metal items may be thrown overboard
  3. Food waste may be thrown overboard anywhere
  4. Plastic and other garbage must be retained and disposed of on shore Correct answer.

Explanation

Garbage, especially plastics, must be kept aboard and disposed of properly ashore. Discharging plastics into the water is prohibited because they persist and injure wildlife. Food waste discharge is also restricted in many areas.

Question 18Safety and Environmental Regulations

What does a diver's flag (red with a white diagonal stripe) indicate to boaters?

  1. A fishing zone open to trolling
  2. A fuel dock ahead
  3. Divers are in the water and boaters must keep clear and reduce speed Correct answer.
  4. A no-wake zone at all times

Explanation

The diver's flag warns that divers are submerged nearby, so boaters must slow down and keep a safe distance. Propeller strikes are a leading cause of serious diving injuries. Approaching closely or at speed is dangerous and unlawful.

Question 19Safety and Environmental Regulations

A small craft is caught in fog with limited visibility. Which action is most appropriate?

  1. Reduce speed, sound appropriate signals, and post a lookout Correct answer.
  2. Anchor in the main channel
  3. Increase speed to reach shore quickly
  4. Turn off all navigation lights

Explanation

In restricted visibility, operators should slow to a safe speed, use sound signals, and keep a proper lookout. Navigation lights must remain on so other vessels can detect the craft. Anchoring in a channel creates a collision hazard.

Question 20Safety and Environmental Regulations

What is the effect of alcohol consumption on a boat operator's ability to respond to emergencies?

  1. It has no effect on the water
  2. It impairs judgment, balance, and reaction time Correct answer.
  3. It improves night vision
  4. It only affects operators of large vessels

Explanation

Alcohol impairs judgment, coordination, balance, and reaction time, all of which are critical on the water. Sun, wind, and motion amplify its effects. Operating a vessel while impaired is illegal and dangerous.

Question 21Safety and Environmental Regulations

When two power-driven vessels are crossing and a risk of collision exists, which vessel is the stand-on vessel?

  1. The vessel on the other's starboard side
  2. The larger vessel
  3. The vessel that sees the other on its own starboard side Correct answer.
  4. The vessel that is overtaking

Explanation

When two power-driven vessels cross, the vessel that has the other on its starboard side must give way, making the other vessel the stand-on vessel. The stand-on vessel maintains course and speed while the give-way vessel maneuvers. Size does not determine right of way.

Question 22Safety and Environmental Regulations

A pleasure craft operator observes another vessel in distress but is unsure of the exact legal duty. What does the regulation generally require?

  1. Render assistance as far as possible without serious danger to the own vessel and persons aboard Correct answer.
  2. Only assist if the other vessel is smaller
  3. Wait for a rescue vessel before acting
  4. Continue the voyage because assistance is voluntary

Explanation

Mariners are required to render assistance to persons in danger at sea so far as it can be done without serious danger to their own vessel and those aboard. This duty is a long-standing legal and humanitarian obligation. Ignoring a distress situation can have legal consequences.

Question 23Safety and Environmental Regulations

Which statement best describes the operator's responsibility regarding the vessel's load and stability?

  1. The operator must ensure the craft is not overloaded and weight is distributed safely Correct answer.
  2. Passenger weight does not affect small craft
  3. Stability is only a concern for sailboats
  4. Overloading is acceptable if lifejackets are present

Explanation

The operator is responsible for ensuring the craft is not overloaded and that weight is distributed to maintain stability. Excess or poorly placed weight raises the risk of capsizing or swamping. Lifejackets do not compensate for unsafe loading.

Question 24Safety and Environmental Regulations

A boat operator is planning to tow a water skier recreationally in PEI waters. Which requirement applies?

  1. Only the skier needs to monitor other traffic
  2. Another person aboard must watch the skier and communicate with the operator Correct answer.
  3. No observer is needed if mirrors are installed on any craft
  4. Towing is allowed at night without lights

Explanation

For ordinary recreational towing, another person must be aboard in addition to the operator to watch each person being towed and communicate with the operator. A rear-view mirror does not substitute for that observer.

Question 25Safety and Environmental Regulations

Which of the following best explains why pleasure craft must be registered or licensed in Canada?

  1. To guarantee insurance coverage
  2. To identify the vessel and support enforcement of safety and environmental laws Correct answer.
  3. To allow the vessel to exceed speed limits
  4. To prove the operator has passed a safety course

Explanation

Vessel licensing or registration provides a unique identifier that supports enforcement, search and rescue, and pollution accountability. It is separate from operator competency cards and insurance. Registration does not confer any speed privileges.

Question 26Safety and Environmental Regulations

Under the Canada Shipping Act small vessel regulations, what minimum age must a person be to operate a pleasure craft fitted with an engine of 10 hp (7.5 kW) or more without adult supervision in Canadian waters?

  1. 16 years of age Correct answer.
  2. 12 years of age
  3. 14 years of age
  4. 18 years of age

Explanation

Canadian small vessel regulations set 16 as the minimum age for unsupervised operation of a pleasure craft powered by an engine of 10 hp (7.5 kW) or more. Younger operators may run such a craft only under the direct supervision of a person who meets the age requirement. The rule exists so that a competent adult is accountable for the vessel's operation.

Question 27Safety and Environmental Regulations

A pleasure craft is operating in PEI coastal waters when the operator sees a person in the water signalling for help. Which obligation does the operator have under Canadian shipping law?

  1. Continue the voyage and report the sighting by radio to the nearest marina
  2. Contact the Joint Rescue Coordination Centre and wait for instructions before altering course
  3. Proceed to give assistance so far as can be done without serious danger to the vessel and persons aboard Correct answer.
  4. Slow down and observe until another vessel arrives to take over the rescue

Explanation

The Canada Shipping Act duty to assist requires every vessel to render assistance to persons in danger at sea, to the extent it can be done without serious danger to the vessel and those on board. Reporting or waiting for instructions does not replace the duty to act. The operator must also identify the vessel and stay until assistance is no longer needed.

Question 28Safety and Environmental Regulations

Which piece of equipment must be carried aboard a pleasure craft so that a person who falls into cold water has a means of being pulled back aboard or kept afloat?

  1. A buoyant heaving line of at least 15 m Correct answer.
  2. A spare propeller
  3. A second anchor with chain
  4. A fire axe

Explanation

Small vessel equipment requirements list a buoyant heaving line of at least 15 m as a required item for many pleasure craft. It provides a floating line that can be thrown to a person in the water and used to recover them. A spare propeller, extra anchor or fire axe does not serve the rescue purpose.

Question 29Safety and Environmental Regulations

An operator is checking the vessel's mandatory safety equipment before departure. Which document must be carried on board a pleasure craft that is licensed in Canada?

  1. The engine warranty card
  2. A copy of the vessel's licence Correct answer.
  3. The marina berthing agreement
  4. The operator's boating safety course certificate

Explanation

A licensed pleasure craft must carry its licence on board, and the number must be displayed on the hull. Proof of operator competency must be carried as well, but the course certificate is only one form of that proof and is not the licence itself. Berthing agreements and warranty cards are not required documents.

Question 30Safety and Environmental Regulations

A pleasure craft operator is preparing to leave a PEI harbour at dusk. Which action best satisfies the requirement to show proper navigation lights?

  1. Rely on the vessel's interior cabin lights to make the craft visible
  2. Turn on the anchor light only because visibility is still reasonable
  3. Use a handheld flashlight pointed forward to signal the vessel's presence
  4. Switch on the sidelights and sternlight, and the masthead light if the vessel is so equipped Correct answer.

Explanation

A power-driven vessel under way at night must display sidelights, a sternlight and, where fitted, a masthead light so other vessels can judge its type, course and aspect. Anchor lights apply only when anchored, not when under way. A flashlight or cabin lighting does not meet the prescribed light configuration.

Question 31Safety and Environmental Regulations

A boat operator plans to operate a pleasure craft at a speed that will create a large wake near a PEI shoreline where boats are moored. Which principle governs this decision?

  1. The operator may proceed at any speed if a lookout is posted at the bow
  2. Speed limits apply only where a regulatory sign is posted at the launch ramp
  3. The operator must operate at a safe speed so the wake does not endanger other vessels, property or the environment Correct answer.
  4. Wake size is unrestricted as long as the vessel stays outside marked swimming areas

Explanation

Operators must proceed at a safe speed for the conditions, which includes controlling wake so it does not endanger moored vessels, shore structures, swimmers or habitat. The duty comes from the collision regulations and local boating restrictions, not only from posted signs. A lookout does not excuse creating a hazardous wake.

Question 32Safety and Environmental Regulations

Which statement correctly describes the requirement for a pleasure craft to carry a means of signalling distress that can be seen or heard?

  1. A whistle is sufficient only on craft under 6 m and no other signal is needed
  2. A sound-signalling appliance such as a whistle or horn is required, and visual distress signals are required in specified waters Correct answer.
  3. Signalling equipment is required only for craft operating after sunset
  4. Visual distress signals are optional on all pleasure craft in Canadian waters

Explanation

Pleasure craft must carry a sound-signalling appliance, and vessels operating in specified waters such as the high seas or large open bodies must also carry approved visual distress signals. The requirement is not limited to small craft or to night operation. Carrying both means of signalling lets the operator attract attention by sound and by sight.

Question 33Safety and Environmental Regulations

An operator notices the engine is overheating and smells hot oil while running in a PEI estuary. Which response best reflects environmental and safety responsibilities?

  1. Increase speed to force cooling water through the engine
  2. Keep running at low speed until the vessel reaches the dock
  3. Stop the engine, check for leaks, and contain any spilled fuel or oil aboard Correct answer.
  4. Open the engine hatch and continue so the heat dissipates

Explanation

Stopping the engine and checking for leaks prevents a spill into the water and addresses the mechanical fault. Any oil or fuel that has escaped should be contained and removed rather than allowed to enter the environment. Continuing to run risks engine damage, fire and pollution.

Question 34Safety and Environmental Regulations

Which behaviour is required of a pleasure craft operator when the vessel is passing a float plane that is taxiing on the water near a PEI harbour?

  1. Pass close astern of the aircraft to stay clear of its wake
  2. Maintain a safe distance and give way, since the aircraft on the water has limited ability to stop or turn Correct answer.
  3. Sound one long blast and hold course at planing speed
  4. Assume the aircraft must give way because it is not a vessel

Explanation

A float plane on the water is treated as a vessel and has limited manoeuvrability while taxiing. The operator of a pleasure craft should keep well clear and give way to avoid a collision. Holding speed or passing close creates unnecessary risk.

Question 35Safety and Environmental Regulations

A boater is deciding where to place a portable fuel tank on a small open pleasure craft. Which practice best reduces fire risk?

  1. Leave the tank unsecured so it can be moved quickly
  2. Place the tank on the seat cushion for easy access
  3. Secure the tank in a ventilated location away from ignition sources Correct answer.
  4. Store the tank in a closed compartment near the engine

Explanation

Portable fuel tanks should be secured in a well-ventilated area away from ignition sources so fuel vapour cannot accumulate. A closed compartment near the engine can trap explosive vapour. An unsecured tank can slide, tip and spill, adding further risk.

Question 36Safety and Environmental Regulations

Which of the following is the operator's responsibility regarding the number of persons and the amount of gear carried on a pleasure craft?

  1. Carry as many persons as can physically fit on deck
  2. Keep the load within the vessel's rated capacity and distribute it to maintain stability Correct answer.
  3. Rely on the vessel's length alone to determine a safe load
  4. Load gear only at the stern to keep the bow high

Explanation

The operator must ensure the craft is not overloaded beyond its rated capacity and that weight is distributed so stability and freeboard are maintained. Overloading or poor distribution reduces freeboard and can cause swamping or capsize. Length alone is not a safe basis for judging load.

Question 37Safety and Environmental Regulations

An operator observes a person on a Personal Watercraft (PWC) operating erratically near swimmers. Which statement best reflects the legal requirements for PWC operation in Canadian waters?

  1. PWCs are exempt from safe-speed rules because they are highly manoeuvrable
  2. PWCs may tow swimmers without a spotter if the rider watches carefully
  3. PWCs must be operated at a safe speed and kept clear of swimmers and other craft Correct answer.
  4. PWCs may operate at any speed if the rider wears a lifejacket

Explanation

A PWC is a pleasure craft and its operator must obey safe-speed rules and keep well clear of swimmers, other vessels and hazards. Wearing a lifejacket is required but does not permit unsafe speed. Towing a person from a PWC requires a spotter and compliance with towing rules.

Question 38Safety and Environmental Regulations

A boater is reviewing the environmental rules that apply before pumping out a holding tank at a PEI marina. Which statement is correct?

  1. Holding tanks may be emptied overboard once the vessel is more than one kilometre from shore
  2. Grey water from a holding tank may be released into any harbour
  3. Holding tanks must be emptied at an approved pump-out facility or beyond the discharge restrictions Correct answer.
  4. Pump-out stations are optional and discharge overboard is always permitted

Explanation

Sewage from a pleasure craft holding tank must be discharged at an approved pump-out facility or in waters where discharge is permitted, not in harbours or restricted zones. Releasing untreated sewage close to shore harms water quality and shellfish areas. Operators should plan pump-out stops as part of the voyage.

Question 39Safety and Environmental Regulations

A pleasure craft operator is planning a trip and wants to reduce the risk of introducing invasive species into PEI waters. Which action best supports this goal?

  1. Empty the bilge into the water at the ramp to lighten the load
  2. Leave the hull uncleaned if the vessel was used in salt water
  3. Clean, drain and dry the hull, trailer and equipment before launching in a new water body Correct answer.
  4. Rinse the hull only with lake water at the launch ramp

Explanation

Cleaning, draining and drying the hull, trailer and gear removes aquatic organisms and standing water that can carry invasive species between water bodies. Rinsing with water from the same site does not remove the risk. Emptying the bilge at the ramp can spread organisms and is not an approved practice.

Question 40Safety and Environmental Regulations

Which statement best explains why a pleasure craft operator must report a collision that causes injury or significant damage to property?

  1. The operator must report to the appropriate authority as required by law and provide identification Correct answer.
  2. Only commercial vessels must report collisions
  3. Reporting is optional and depends on whether the other party agrees
  4. Reporting is required only when the vessel sinks

Explanation

Canadian regulations require the operator involved in a collision causing injury or significant property damage to report it to the appropriate authority and to give identification and assistance. The duty is not limited to commercial vessels or to sinkings. Failing to report can lead to penalties and leaves injured parties without timely help.

Question 41Liquid and Vapor Piping Systems

On an ammonia refrigeration system, which piping material is normally prohibited because ammonia attacks it in the presence of moisture?

  1. Stainless steel
  2. Carbon steel
  3. Copper Correct answer.
  4. Ductile iron

Explanation

Ammonia refrigerant reacts with copper and copper alloys, especially when any moisture is present, causing rapid corrosion and possible failure. Carbon steel, stainless steel and ductile iron are all acceptable materials for ammonia service. This is why ammonia systems use steel pipe throughout.

Question 42Liquid and Vapor Piping Systems

What is the primary purpose of providing a liquid subcooler in a liquid refrigerant line feeding an evaporator?

  1. To prevent flash gas at the expansion valve so the valve sees solid liquid Correct answer.
  2. To raise the discharge pressure of the compressor
  3. To remove oil from the liquid refrigerant
  4. To increase the superheat at the evaporator outlet

Explanation

Subcooling the liquid below its condensing temperature keeps it liquid as it travels to and through the expansion device, preventing flash gas that would reduce valve capacity. It does not change discharge pressure, oil content, or outlet superheat directly. The benefit is a solid column of liquid at the expansion valve.

Question 43Liquid and Vapor Piping Systems

Why are suction lines in a direct-expansion refrigeration system sloped back toward the compressor?

  1. To prevent liquid refrigerant from reaching the evaporator
  2. To reduce pressure drop across the suction filter
  3. To drain condensed water to the receiver
  4. To return refrigerant oil to the compressor Correct answer.

Explanation

Oil travels with the refrigerant and must find its way back to the compressor crankcase. Sloping the suction line in the direction of flow lets oil drain back instead of pooling in low spots. Water drainage and evaporator feed are handled by other components.

Question 44Liquid and Vapor Piping Systems

A double suction riser is installed on a vertical suction line. What condition is it designed to handle?

  1. Light load operation where a single riser would be too large to carry oil Correct answer.
  2. Full load operation where refrigerant velocity is highest
  3. Hot gas defrost cycles
  4. Liquid overfeed from the receiver

Explanation

At light load, refrigerant velocity in a full-size vertical riser may drop too low to lift oil. A double riser uses a smaller riser for light loads and brings the larger riser into service at high loads, maintaining oil return across the range. It is a load-management feature, not a defrost or overfeed device.

Question 45Liquid and Vapor Piping Systems

What is the main reason hot gas discharge lines are pitched in the direction of flow toward the condenser?

  1. To carry oil along with the refrigerant and prevent it pooling in the condenser inlet Correct answer.
  2. To keep the discharge line below the condensing temperature
  3. To reduce the noise of high-velocity discharge gas
  4. To allow condensate to drain back to the compressor

Explanation

Discharge gas carries oil mist that must move toward the condenser and receiver rather than collecting in low points. Pitching the line with flow helps oil travel and prevents oil logging. Noise and condensing temperature are not controlled by line pitch.

Question 46Liquid and Vapor Piping Systems

In a pumped liquid recirculation system, what does a recirculation ratio of 3:1 mean?

  1. Three parts vapor return for each part liquid
  2. Three parts liquid are pumped to the evaporator for each part evaporated Correct answer.
  3. The pump runs three times per hour
  4. Three evaporators share one liquid line

Explanation

The recirculation ratio compares the mass of liquid supplied to the evaporator with the mass actually vaporized there. A 3:1 ratio means three kilograms are pumped for every kilogram evaporated, with the excess returning to the low-pressure receiver. This improves heat transfer and ensures full wetting of evaporator surfaces.

Question 47Liquid and Vapor Piping Systems

Which device is installed in a liquid line to protect the expansion valve from moisture and particulate contamination?

  1. Liquid line solenoid valve
  2. Check valve
  3. Sight glass
  4. Filter-drier Correct answer.

Explanation

A filter-drier removes moisture and solid particles from the liquid refrigerant before it reaches the expansion valve, protecting small orifices from blockage and ice formation. A sight glass only indicates condition, and the solenoid and check valve control flow direction. The filter-drier is the protective element.

Question 48Liquid and Vapor Piping Systems

What does a clear, bubble-free sight glass in the liquid line most reliably indicate?

  1. The expansion valve is properly superheated
  2. The system charge is exactly correct
  3. The line is full of liquid with no significant flash gas at that point Correct answer.
  4. The filter-drier is new

Explanation

A clear sight glass shows that liquid, not a liquid-vapor mixture, is passing that point in the line. It does not prove total charge is correct, because a restricted line or partial blockage can also produce a clear glass. Superheat must be measured at the evaporator outlet.

Question 49Liquid and Vapor Piping Systems

A liquid line solenoid valve is used with pump-down control. What is its function?

  1. To modulate liquid flow in response to superheat
  2. To relieve excess pressure back to the receiver
  3. To bypass hot gas during defrost
  4. To stop liquid flow to the evaporator so the compressor can pump the low side down Correct answer.

Explanation

In pump-down control the solenoid closes on thermostat satisfaction, stopping liquid feed while the compressor continues running until the low-side pressure reaches the setpoint. This stores refrigerant in the high side and receiver. Modulating flow and hot gas bypass are different functions.

Question 50Liquid and Vapor Piping Systems

Why must a thermostatic expansion valve be selected and adjusted to give a small but positive superheat at the evaporator outlet?

  1. To prevent oil from leaving the compressor
  2. To ensure only vapor reaches the compressor while fully using evaporator surface Correct answer.
  3. To maintain a constant condensing pressure
  4. To keep the evaporator flooded with liquid at all times

Explanation

Positive superheat guarantees the refrigerant is fully vaporized before it leaves the evaporator, protecting the compressor from liquid slugging. Too much superheat wastes evaporator capacity, so the setting balances protection with performance. Condensing pressure and oil return are separate concerns.