Plumbing Practice Exam Questions With Complete Solutions

The minimum diameter for a dry vent is correct answer: 1 1/4 inches The minimum clearance from the center of a water closet to walls, partitions or fixtures on either side is: correct answer: 15 inches During a shower inspection you can determine compliance of safety glazing by correct answer: Looking for the manufacturer's label in the glass Clothes washer discharge into a laundry tub must be protected by correct answer: An air break A water heater inspection includes checking for all of the following features EXCEPT: correct answer: Vacuum breaker installation The minimum average static pressure at the building entrance for public or private water service is: correct answer: 40 psi When inspecting a combination pressure/temperature relief valve, which of the following conditions is NOT acceptable? correct answer: The discharge pipe is the same size as the relief valve outlet and not trapped When inspecting a water heater, you find the following conditions. Which one is a violation? correct answer: The heater contains separate pressure and temperature relief valves A kitchen drain, if properly trapped, will have a minimum water seal of: correct answer: 2 inches The minimum air gap for a kitchen faucet is: correct answer: 1 1/2 inches When a vent terminates less than 2 feet above a window, what is the minimum horizontal distance required to the window opening? correct answer: 10 feet The minimum pitch for a 3-inch drain is _____ inch per foot? correct answer: 1/8 Shower compartments must have a minimum curb height of at least: correct answer: 2 inches Back siphonage of nonpotable liquids into the potable water supply piping may be prevented by all of the following methods EXCEPT correct answer: Check valve Which of the following valves is required for water service shutoff for a Hosebib? correct answer: Stop and waste The minimum clearance for accessibility for a 2-inch cleanout is how many inches? correct answer: 12 A vent pipe shall not terminate within 10 feet horizontally of a window unless the vent is extended at least what distance above the window? correct answer: 2 feet The total fall in a fixture drain due to pipe slope is limited to a maximum of _______. correct answer: one pipe diameter Where a fixture is separately trapped, what is the maximum vertical distance permitted from the fixture outlet to the trap weir? correct answer: 24 inches All of the following are common toilet problems EXCEPT correct answer: excess pressure at tank Soil pipes correct answer: carry liq