A S S I G N M E N T  7 Textbook  Assignment: “Mechanical Systems and Plan.” Pages 8-1 through 8-24. “Electrical Systems and Plan.” Pages 9-1 through 9-19. “Construction  Drawings.” Pages 10-1 through 10-33. 7-1. 7-2. 7-3. 7-4. 7-5. The system of pipes, fixtures, and appurtenances used inside a building for supplying water and removing  wastes  is  known  by  what general  term? 1. Mechanical systems 2. Plumbing 3. Water distribution 4. Piping When  working  with  mechanical  plans, you must become familiar with which of  the  following  codes? 1. National Plumbing Code and National  Electrical  Code^® 2. National Plumbing Code and local  NAVFAC  codes 3. Local  codes  and  National Plumbing  Code 4. Local  codes  and  ANSI  codes Copper is widely used for tubing in piping systems for which of the following  reasons? 1. It is less costly than other types of pipe 2. It is available in two wall thicknesses  and  is  faster  to install 3. It does not rust and is resistant  to  scale  particles  in the pipe 4. Fittings  are  screwed  to  the pipe which allows for faster completion of the piping system Which  of  the  following  types  of copper  tubing  is  frequently  used  as replacement  piping  because  of  its flexibility? 1. Type K 2. Type L, hard tempered 3. Type M 4. Type L, soft tempered Which of the following advantages does  plastic  pipe  have  over  metal? 1. Flexibility 2. High resistance to rupture and total  resistance  to  rust 3. It can be installed either above or below ground 4. All of the above 7-6. What type of polyvinyl chloride pipe can be used in both cold-water and  hot-water  systems? 1. PVC 2. APVC 3. CPVC 4. PVC-C 7-7. Galvanized steel pipe sizes are based on what nominal size? 1. Inside  diameter 2. Outside diameter 3. Wall  thickness 4. Inside  radius 7-8. What  type  of  fitting for  joining  straight should be used runs of dissimilar metal pipe that require easy  disconnection? 1. Union 2. Coupling 3. Dielectric union 4. Dielectric coupling 7-9. For what type of pipes should (a) solvent welded and (b) sweated joints be used? 1. (a) Galvanized (b) plastic 2. (a)  Plastic (b)  copper 3. (a)  Plastic (b) galvanized 4. (a)  Copper (b)  plastic IN  ANSWERING  QUESTIONS  7-10  THROUGH  7-13, SELECT THE TYPE OF VALVE FROM THE FOLLOWING LIST THAT BEST MATCHES THE DESCRIPTION  GIVEN  IN  THE  QUESTION. 7-10. This valve has a wedge-shaped, movable plug that fits tightly against the seat when closed. 1.  A 2.  B 3.  C 43