NCCER Plumbing Level 2 - Questions and Answers

NCCER Plumbing Level 2 - Questions and Answers Water softeners are not required to be connected to a line serving a hose bibb Rate of flow in water supply piping is measured in gallons per minutes Sizing tables showing the WFSUs for residential fixtures are found in Local codes A curb box provides access to a Curb stop To ensure frost protection when installing water supply piping, Insulate water supply pipes that run inside exterior walls Before you install each fixture, confirm the stubout dimensions, using Approved submitted data Water hammer is caused by The sudden closing of a valve A hydrostatic test checks for leaks in a water supply piping system using Water You are conducting a hydrostatic test on a water supply piping system. Immediately after filling the piping system with water, the next step is to Open valves at high points in the system The part of the pipe that extends beyond the finished wall is called an Stubout To position riser and stubout assemblies firmly in the their permanent location, use A drop ear elk or high ear ell Water supply piping should be leak-tested Before the walls are closed Test caps plug are not recommended for use with which type of pipe? Copper If the backflow prevention specified on the construction drawings differs from what is recommended in your local applicable code, you should submit an RFI To prevent freezing, underground water supply pipes should be located, if possible, under Lawns Which type of valve allows flow to be shut off quickly by a small movement of a lever or other control? Full flow In a stuffing box, the packing is pressed against the stem by a(n) Follower Á split-wedge gate valve is a good choice for lines that transport. cold water When periodic disassembly of the valve is not required, the basic type of bonnet used is the Molded bonnet Relief valves are typically used for service with Liquids Ball cocks are also known as Float-controlled valves Electronic flushometers trigger the flushing action with a(n) infrared device If on-off service is required, do not select a globe valve A valve rated for use in the petroleum industry would be most likely to have which of the following letter combinations printed on the valve body? OG Valves for use with low-pressure steam are made of Iron Teflon® is often used to form compression washers All of the following are advantages of using stainless steel valves except their low cost Information on valve ratings is not found in model codes You should never attempt to repair a valve that is under pressure When servicing a valve, avoid using pliers they can damage the valve's finished surface A gate valve that shows signs of wire drawing must be replaced When installing a float-controlled valve, ensure that the gasket is in place against the flange before placing the washer and nut on the base of on the outside of the tank the assembly and tightening Flow reversal in a piping system is prevented by which category of valve? Check When compared with other types of bonnets, bolted bonnets are a good choice for high-pressure lines For piping applications where valves must be changed frequently for repair or replacement, it is best to install valves with Flanged ends A valve that is designed to carry gasoline is marked on the valve body with the letter G In a valve rating, the letter L indicates liquid other than water Purposes For the of repair work, angle valves and compression faucets can be grouped with globe valves Which of the problems listed below is commonly found in flushometers? The vacuum breaker has failed. When servicing a float-controlled valve, do not adjust the float ball by bending the float arm because the rod may rotate a half-turn, causing the tank to overflow When fixtures are delivered to the job site, they should be stored in location that is secure and close to the point of installation