Free C-36 trade practice exam: Timed, Scored, Explained
50 questions picked at random from our free set. Answer them all, then finish to see your score, your weakest section, and every question explained with its official source. No sign-up.
50 questions split by CSLB's trade-exam section weights (22/22/20/19/17%).
0 of 50 answered 0:00
1 / 50
A plumber is sweating copper joints on a drinking water line. The lead content of solder and flux used in piping that conveys water for human consumption shall be not more than what?
2 / 50
Before calling 811, an excavator must delineate the area to be dug. Under Government Code Sections 4216 and 4216.2, what color is used to delineate the proposed excavation?
3 / 50
A plumber is explaining plumbing hazards to an apprentice. What is a cross-connection?
4 / 50
A new plastic (ABS) drainage and vent system is ready for its rough test. What test medium must be used?
5 / 50
A gas line is being installed to a furnace. At what point should the shutoff valve be located?
6 / 50
A horizontal wet vent for a bathroom group receives 6 drainage fixture units. What is its minimum diameter?
7 / 50
When installing two toilets in the same bathroom, what is the minimum center-to-center distance between them?
8 / 50
The required tests and inspections show that the plumbing work complies with the code. What shall the Authority Having Jurisdiction issue to the permittee on demand?
9 / 50
An unlicensed handyman bids $800 for labor and materials on a plumbing job that requires a building permit. Under Business and Professions Code Section 7048, does the minor work exemption apply?
10 / 50
A plumber is using a 20-pound cylinder of propane (a flammable gas) for a torch on the job site. What fire extinguisher must be provided?
11 / 50
The Authority Having Jurisdiction requires a building trap on a building drain. What must the building trap be provided with?
12 / 50
To repair a leaking valve, a plumber must cut into asbestos thermal system insulation (TSI) that is likely to be disturbed. What class of asbestos work is this repair and maintenance operation?
13 / 50
A contractor is separating job costs while preparing a bid. Which of these is an overhead expense rather than a direct cost of a job?
14 / 50
A crew is hanging water lines in the basement of a new house. What is the maximum horizontal support interval for 1 inch copper water pipe?
15 / 50
A plumber is replacing a long run of horizontal drain piping during a remodel. Where must each horizontal drainage pipe be provided with a cleanout?
16 / 50
A contractor is estimating a plumbing job. Labor costs in an estimate include the hourly wage rate plus what?
17 / 50
A 3/4 inch Schedule 40 natural gas line (0.5 in. w.c. pressure drop) serves a furnace at 100 cubic feet per hour and a water heater at 40 cubic feet per hour. The piping runs 30 feet from the meter to the most remote appliance. Is 3/4 inch large enough?
18 / 50
A plumber is repiping a house in PEX and running tubing horizontally along a basement wall. How often must horizontal PEX tubing 1 inch and smaller be supported?
19 / 50
While replacing a water heater, a plumber adds unions so the next replacement is easier. Where shall the unions be installed?
20 / 50
A 6 inch horizontal building storm drain is sloped at 1/8 inch per foot, and the design rainfall rate is 4 inches per hour. What is the maximum allowable horizontal projected roof area it can serve?
21 / 50
A tank fill spout has an effective opening of 2 inches in diameter, and the air gap is not affected by sidewalls. What is the minimum air gap?
22 / 50
An owner converts a retail store into a restaurant, a change in occupancy as defined in the building code. Which requirements must the building's plumbing system meet?
23 / 50
A plumber installs a 3/4 inch PEX water supply line. What is the maximum horizontal support spacing?
24 / 50
A plumber is replacing a worn-out interceptor at a car wash that catches sand. What is the minimum water seal for an interceptor for sand and similar heavy solids?
25 / 50
A crew is connecting a horizontal drain to a stack in a new apartment building. Which fitting may a horizontal drainage line use to enter a vertical stack?
26 / 50
Before handling a new chemical product, you check its safety data sheet for the required personal protection. Which SDS section covers exposure controls/personal protection?
27 / 50
A crew leader is rigging anchor points for fall protection. An anchorage for personal fall arrest equipment must be capable of supporting at least how much per employee attached (unless designed under a qualified person as part of a complete system)?
28 / 50
A lavatory, a bar sink and a drinking fountain share one horizontal branch drain; their private DFU values from Table 702.1 total 2.5. Which is the first branch size in Table 703.2 that can carry that load?
29 / 50
A contractor is laying out the restroom plumbing for a new office. What is the minimum size trap and trap arm for a urinal with an exposed trap?
30 / 50
A plumber replaces an accessible restroom sink during a remodel. Under California Building Code Section 11B-606.3, what is the maximum height of the front of the rim above the finish floor?
31 / 50
A water heater sits in an attic above a finished ceiling. What is the minimum diameter of the drain from its drainage pan?
32 / 50
A gas water heater sits in a separate, enclosed space that can be entered only from outside of the garage. May it be installed at floor level?
33 / 50
A plumber has pressurized the fuel gas piping in a new house for a test. How are leaks located in fuel gas piping under test pressure?
34 / 50
A crew is testing the potable water lines in a new house with water. When a potable water supply system is tested with water, what must the test pressure be?
35 / 50
A water closet flushometer valve is equipped with an atmospheric vacuum breaker. How high above the overflow rim of the bowl must its critical level be?
36 / 50
A plumber with long hair is about to run a drain machine with a rotating cable. What must the plumber do where there is a risk of injury from hair entanglement in moving parts of machinery?
37 / 50
A plumber receives a new chemical product on a job site. Which of these is a required section heading of a safety data sheet (SDS)?
38 / 50
Under California Building Code Section 11B-304.3.1, what is the minimum diameter of a circular turning space?
39 / 50
A contractor is adding a graywater system to a home. Graywater includes wastewater from which of these?
40 / 50
After a repair, a potable water system is filled with a water-chlorine solution containing 50 parts per million of chlorine. How long shall the system be valved off and allowed to stand?
41 / 50
A crew is cleaning machine parts in a shop. A wash rack or floor used for cleaning machinery or machine parts must drain or discharge into what?
42 / 50
While making a press-connect repair on copper tubing, a plumber fully inserts the tubing into the fitting. Where shall the tubing be marked?
43 / 50
A plumber is choosing a location for a backflow prevention device with atmospheric vents or ports. Where is a device with atmospheric vents or ports prohibited from being installed?
44 / 50
A public restroom has 7 water closets with flushometer valves. Using CPC Table 610.10, what accumulative fixture unit value is assigned to these water closets?
45 / 50
A plumber is choosing traps for fixtures in a remodel. Which of these traps is prohibited?
46 / 50
Which type of backflow prevention device is required at an outdoor hose bib (frost-proof faucet)?
47 / 50
A plumber reviews fire extinguisher classes before starting work on a job site. Fires involving energized electrical equipment are which class?
48 / 50
A plumber is running a vent line in the attic of a new house. How must a horizontal vent pipe be graded?
49 / 50
A PRV on a supply system is set to deliver 65 psi downstream. The incoming city pressure is 100 psi. What is the pressure drop across the PRV?
50 / 50
A homeowner pulls a permit to remodel a single-family house that still has old 3.5-gallon toilets. Under Civil Code Section 1101.4, what is a condition for final permit approval?