Finish Plumbing Installations — California C-36 Practice Questions

46 questions · 20% of the C-36 Plumbing Trade exam

Worked questions

1. On a small hospital renovation during plan review, a water-heater relief line rises after leaving the valve and terminates with a threaded cap; what is required?

Gravity discharge to an approved point
BInstall a shutoff valve for testing
CConnect it to the cold inlet
DLeave the cap loose

Why A is correct

A relief line must not be blocked, trapped, or valved because restriction can prevent safe pressure or temperature discharge. The best answer is therefore “Provide an unobstructed gravity discharge arrangement to an approved termination.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.

2. A check valve traps heated water between the service and tank. Which pressure condition needs control?

AFixture-unit diversity
Expansion pressure from heating the trapped water
CLoss of drainage venting
DReduced gas heating value for the described plumbing system and documented site conditions

Why B is correct

The best answer is: Expansion pressure from heating the trapped water. Heated water expands. In a closed distribution system that volume cannot return toward the source, so an approved and properly sized expansion-control method prevents pressure rise and nuisance relief discharge. The transferred field condition applies the same plumbing design, installation, service, or safety principle to a different project setting. The alternatives omit a prerequisite, conflict with the approved method, or fail to control the stated sanitation or physical hazard.

3. Domestic water piping is scheduled for enclosure before its required test and inspection. Which sequence is correct?

ACover it and test only fixtures
Test and inspect the system before concealment
CRely on visual joint appearance
DIncrease final pressure after occupancy for the described plumbing system and documented site conditions

Why B is correct

The best answer is: Test and inspect the system before concealment. Pre-concealment testing finds leaks while joints remain accessible and avoids representing unverified work as complete. The best answer is therefore “Test and inspect the system before concealment.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts. The transferred field condition applies the same plumbing design, installation, service, or safety principle to a different project setting. The alternatives omit a prerequisite, conflict with the approved method, or fail to control the stated sanitation or physical hazard.

43 more in the bank

Answers and explanations for these are in the app.

A check valve creates a closed cold-water supply to a storage heater. What condition must be addressed?
A fixture is installed with two traps in series. Why should the arrangement be corrected?
A flexible appliance connector is proposed through a wall and used as permanent building piping. What is the proper response?
A flushometer operates poorly despite acceptable static pressure. Which field measurement is most useful?
A multi-tenant building has no practical way to isolate one fixture group without shutting down all tenants. What finish-work improvement is appropriate?
A reduced-pressure backflow assembly is installed where relief discharge would flood electrical equipment. What must change?
A wall-hung lavatory rocks after installation. What should be corrected before sealing the fixture?
After a pressure booster is installed, what final check demonstrates acceptable system behavior?
Before placing a grease interceptor system in service, what should be verified?
On a light-industrial addition during plan review, a shower receptor holds water away from the drain after installation; what should be corrected?
On a multifamily project during plan review, a backwater valve is installed below a permanent floor with no access panel; what is wrong?
On a office renovation during plan review, concealed water piping is about to be covered but has not been pressure-tested; what is the proper sequence?
On a restaurant build-out during plan review, a newly set water closet rocks on the finished floor; what should be done before turnover?
On a retail shell project during plan review, a public lavatory delivers excessively hot water despite a normal water-heater setting; what should be verified?
On a school modernization during plan review, a solvent-cement plastic joint is assembled over wet, dirty pipe without proper preparation; what is the likely result?
On a single-family remodel during plan review, a wall-hung fixture moves when loaded during final inspection; what is required?
On a tenant improvement during plan review, a lavatory trap is installed with an excessive vertical drop before the vent connection; what concern should be checked?
On a warehouse conversion during plan review, horizontal piping sags between widely spaced hangers at finish inspection; what should be corrected?
Remote hot-water branches are cool while nearby branches are hot. What should commissioning evaluate first?
What is the purpose of the required high-loop or approved air-gap arrangement on a dishwasher discharge?
Where should a storage water heater's temperature-and-pressure relief valve discharge piping terminate?
Why does food-service equipment commonly discharge through an approved indirect connection?
A backwater assembly is buried beneath tile with no removable access. What serviceability defect exists?
A dishwasher drain connects low below a sink without its required high loop or air gap. What contamination path is being controlled?
A flexible gas connector passes through a partition as permanent piping. How should it be used instead?
A flush valve has acceptable static pressure but fails during use. Which dynamic measurement should be obtained?
A horizontal drain loses grade because hangers are spaced too far apart. Which finish correction is needed?
A lavatory tailpiece falls too far before its vented trap arm begins. Which trap-seal risk must be corrected?
A new pressure booster delivers 60 gallons per minute during a three-minute acceptance test. How much water moves during the test?
A newly installed closet rocks after its flange bolts are tightened. What should be corrected before turnover?
A sink drains through two traps installed in series. Why should one be removed?
A storage heater relief pipe ends where discharge cannot be safely observed. What termination is required?
A T&P discharge pipe runs uphill and ends at a threaded valve. What arrangement is required instead?
A tiled shower receptor ponds along one edge after installation. What must be restored without damaging waterproofing?
A wall-hung basin moves because fasteners missed structural backing. What must be corrected before final sealing?
A wall-mounted urinal deflects from the wall when loaded. What support must be provided before sealant is applied?
An RP backflow assembly can dump water onto energized equipment. What location and drainage correction is needed?
Before a grease interceptor is accepted, which flow, vent, access, and maintenance features should be demonstrated?
Food-processing equipment is directly connected to sanitary drainage. Why may an indirect receptor be required?
One tenant fixture group cannot be isolated without shutting down an entire building. Which valve improvement is appropriate?
Remote recirculation branches remain cool while nearby returns are hot. Which balancing and pump factors should be checked?
Solvent cement is applied to damp, contaminated plastic pipe without the listed preparation. What should be expected of the joint?
Water at a public handwashing fixture can reach a scalding temperature. Which outlet-temperature protection requires verification?

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