Download 2025-2026 Alaska Plumbing License Certification Exam: 200 Questions and Answers and more Exams Engineering in PDF only on Docsity!
2025 - 2026 ALASKA PLUMBING LICENSE
CERTIFICATION EXAM|ACTUAL 200 QUESTIONS
AND ANSWERS|A+GRADE
When is a plumbing permit required? - ANS:>>> For any system construction, removal, or repair (full system) Can a homeowner do his/her own installation? - ANS:>>> No, you have to have a licensed plumber in NC for system work What are the 3 basic parts of the plumbing system? - ANS:>>> Supply, Drain, Fixtures What are the 3 classes of pipe in a drainage system? - ANS:>>> D rain (waste), Traps, Vents What are the 3 basic outdoor plumbing combos? - ANS:>>> City H20 + City Sewer ( no new infrastructure) Well + Septic (homeowner, 'off-grid') City H20 + Septic (water is easier to install than sewer) What are the 3 categories of inspection? – ANS:>>> 1. Rough-in (underground): buried piping
2. Middle rough-in: before drywall (sanitary, storm, and water) 3. Final: all fixtures are in and ready to be used Is a permit required to fix a leak? - ANS:>>> Nope, but you still have to follow code
What is an isometric plumbing drawing? What angle does it meet at? What is another name for this type of drawing? - ANS:>>> A 3D representation of pipes, fittings and fixtures on a 2D platform. 120degrees. Riser diagram. How much is 1 F.U. Value? - ANS:>>> 7 .5 gal/min 1 cubic foot What is the minimum fall/foot? - ANS:>>> 1/4in per 1ft (horizontal pipes) What's the difference between a drain pipe and a waste line? - ANS:>>> Drain: organic waste Waste line: liquid waste What is the minimum size for a building drain? When is this not the case? - ANS:>>> 3" When you have more than 2 water closets, it becomes 4"
5 ways the trap seal can be broken? - ANS:>>> 1. There is bad ventilation and excess pressure
2. The fixture isnt used enough, the H2O evaporates 3. Bad things get flushed and absorb the H2O 4. Weather (wind) come into the vent 5. Bad installation of the trap If installed properly traps DO NOT LEAK, because they are an unbroken entity Which fixtures require a trap? - ANS:>>> All but the toilet (cause it gots a built in one) What/where is the crown weir? - ANS:>>> It is the top of the liquid seal, located on the outlet side of a toilet trap. What is the trap arm? - ANS:>>> The pipe that separates the trap liquid seal, and the vent. Can a fixture be double trapped? - ANS:>>> Don't do it What is the maximum drop for a fixture tail piece before it hits the trap? - ANS:>>> 24" Where are cleanouts required? - ANS:>>> Where building sewer meets public sewer. Required for all horizontal piping.Required for any
change of direction > 45 degrees. What is developed length? - ANS:>>> Full measurement of piping (if there is a bend, you follow the bend for the measurement) What type of pipe is most used in residential drainage? – ANS:>>> 1. PVC
2. ABS 3. Galvanized Steel 5 Reasons why PVC is dope for drainage: - ANS:>>> 1. Slick (no friction) 2. Cheap 3. Durable (temp resistant) 4. Glue assembly (chemical weld) 5. Easily cut DWV? - ANS:>>> Drain, Waste, Vent What is a street fitting? - ANS:>>> A fitting with a hub on only one side Whats the distance of VTRs to openings? - ANS:>>> 15'
Place within the thermal envelope Locate close to fixtures Use less hot water Add heat traps What materials are used for supply pipes? - ANS:>>> 1. Pex
2. CPVC 3. Copper 4. Galvanized steel What are the three types of water heater? - ANS:>>> 1. Tanked WH (always heating) 2. Instant WH (heats when needed) 3. Heat Pump WH (reverse AC) 4. Solar Thermal (not a stand alone system) What is a flare connector used for? - ANS:>>> Gas and vibrating systems (keeps the seal)
How is PVC connected? PEX? Copper?Ste el? - ANS:>>> With glue- chemical weld Crimp fitting Soldering Threaded What is a manifold system? - ANS:>>> Individual lines feed to each fixture Which of the following traps are permitted by special permission? A. bell B. S C. drum D. crown vented trap - ANS:>>> C A roof mounted ari conditioner unit is condensing at the rate of 5 GPM. How much DFU? A. 4
A. 1
B. 2.
C. 4.
D. 43 - ANS:>>> A
What is the PSI at the bottom of the drainage pipe if the test for a 4" drainage system is 30' of head? A. 15 psi B. 14 psi C. 13 psi D. 12 psi - ANS:>>> D PSI = feet of head x. 30 (feet of head) x .433 = 12. When gas piping is installed through wood studs and is less than 1 1/4" from the nearest end of the stud, the point of passage shall be protected with a face plate not less than. A. 1/ B. 1/ C. 3/ D. 1/8 - ANS:>>> B What is the corresponding feet of head in a sprinkler system whose pressure is 40 PSI? A. 93 B. 112 C. 117
D. 116 - ANS:>>> A
Feet of head is 2.31 x PSI 40 x 2.325= 93 A multimeter would test for which of the following? A. current B. CFM C. CFH D. gallons per hour - ANS:>>> A How is the vent from an indirect waste pipe run to the outside? A. separately, unconnected B. within an approved partition C. vertically only
What is the center line rough in dimension of urinals? A. 36 inches B. 30 inches C. 20 inches D. 24 inches - ANS:>>> B What is the hydrostatic pressure test for a new drainage system? A. 15' of head for 15 minutes B. 10' of head for 15 minutes C. 10' of head for 30 minutes D. 15' of head for 30 minutes - ANS:>>> B How high above a fixture must the critical level (c/l) of the vacuum breaker be? A. 6" B. 4" C. 2" D. 3" - ANS:>>> A Where is the critical level (c/l) on vacuum breaker when there is no marking? A. the top B. the bottom C. 6" above the top D. 6" below the bottom - ANS:>>> B
A 3" water main is standing full of water after a pressure test. The guage ready at the base is: A. 23.1 psi B. 28.19 psi C. 42 psi D. 18.05 psi ASSUME the main is standing with 42' of head. - ANS:>>> B 42' x .433 = 18. Corrosive liquids shall not be discharged into the drainage system A. without being doused B. without being diluted C. not permitted D. without prior treatment - ANS:>>> B How high above the floor of a garage must a water heater be installed? A. 12" B. 16" C. 18" D. 24" - ANS:>>> C How high above overflow tube of a tank type water closet must the ball cock be located? A. 2" B. 1"
B. 4'
C. 5'
D. 6' - ANS:>>> D
According to the IPC, and disregarding exceptions, the maximum length of an appliance fuel connector shall be: A. 3' B. 4' C. 5' D. 6' - ANS:>>> A Appeals may not be taken on lien matters. A. True B. False - ANS:>>> B The person upon whom a lien is placed, if he loses, my pay reasonable attorney's fees and all court costs. A. True B. False - ANS:>>> A Any person agains whom a lien claim is filed may at any time upon days written notice with the. A. 3, post a bond, county clerk B. 5, pay the balance due, certified check C. 3, form an escrow account, bank D. 5, post a bond, county clerk - ANS:>>> A
Hard drawn copper tubing must bear a 1/4" stripe in indelible ink to mark its type. Type L copper tubing is identified by what color stripe? A. red B. blue C. green D. yellow - ANS:>>> B An excavated trench 30' long, 3' wide and 2' deep. If soil swell is ignored, how much clean fill is required to fill the trench? A. 6 - 7 cubic yards B. 7 - 8 cubic yards C. 8 - 9 cubic yards D. 9 - 10 cubic yards - ANS:>>> A A pip which makes an angle of not more than 45 degrees to the vertical is known as? A. a vertical pipe B. a horizontal pipe C. an obtuse angle D. acute angle - ANS:>>> A According to the IPC, a 120' length black malleable pipe carrying 46,000 Btuh of gas demand shall have threads cut on the pipe at each fitting or joint. A. 8 B. 10
What is required on a sewage ejector pump? A. backflow preventer B. gate valve & a swing check C. flow control valve D. remote shut off device - ANS:>>> B A plastic pipe gas piping system has been installed. The developed length of the system is 27'. The total demand of the system is 375,000 Btuh. What is the minimum allowable size for the yardline? A. 5/8" B. 7/8" C. 1 1/8" D. 1 1/4" - ANS:>>> C According to the International Plumbing Code, the horizontal wet venting of sinks or floor drains by means of a common waste and vent pipe, adequately sized to provide free movement of air above the flow line is. A. combination waste and vent system B. wet drain section C. wet vent section D. combination drain section - ANS:>>> A Premiums for workers' compensation are based on all of the following except: A. associated with the business B. type of business C. employer's annual payroll
D. age of employee - ANS:>>> D What is considered excessive water pressure? A. over 80 PSI B. over 70 PSI C. over 75 PSI D. over 15 PSI - ANS:>>> A What is the requirement in the water supply when the pressure at the street exceeds 80 PSI? A. pressure regulator B. approved pressure regulator C. building occupancy permit D. an engineer's approval - ANS:>>> B According to the International Plumbing Code, the maximum trap loading for a 2" trap is DFU. A. 2 B. 3 C. 4 D. 5 - ANS:>>> B A pipe which makes an angle of not more than 45 degrees to the horizontal is known as: A. a horizontal pipe B. a vertical pipe
