1-23. In what way, if any, does the purpose of a dolphin differ from that of a pile cluster? 1. Dolphins are used to protect a pier, while pile clusters protect offshore structures 2. Dolphins are used to protect moles, while pile clusters protect  groins 3. Dolphins are used to protect ships only, while pile clusters protect  piers  only 4. None. They are both used as protection for both piers and ships Learnning  Objective:  Describe  the types  of  fasteners  and  connectors used  in  heavy-timber  construction. 1-24. What type of heavy-timber fastener has square heads and nuts? 1. Pin 2. Bolt 3. Spike 4. Rail 1-25. In  timber  construction,  what  is the minimum spacing, in inches, between  bolts? 1. 9 2. 7 3. 3 1/2 4. 1 1/2 1-26. A timber fastener that is used primarily  to  prevent  one  member from  moving  laterally  in  relation- ship to another is called a 1. lag  bolt 2. driftbolt 3. cleat 4. dowel 1-27. A short length of timber that is spiked  or  bolted  to  the  adjoining members of a joint is a 1. connector 2. scab 3. cleat 4. block 1-28. What is the general term applied to the variety of devices used in bolted-lap joints between heavy timbers? 1. Driftpins 2. Spike  grids 3. Expansion  bolts 4. Timber connectors 1-29. What type of connector is embedded in circular grooves in the faces of the  timbers  being  jointed? 1. Spike  grid 2. Toothed ring 3. Split  ring 4. Shear  plate 1-30. Which, if any,   of  the  following rings  is/are  are  embedded  by pressure? 1. Toothed  ring  only 2. Spike  grid  only 3. Toothed  ring  and  spike  grid 4. None of the above Learning  Objective:  Identify different  structural  steel  shapes and their uses. 1-31. What standard structural shape is most commonly used for columns? 1.   C 2.   HP 3.   S 4.   W 1-32. For what reason does the W-shape provide  greater  strength  than  the S-shape? 1. Its flanges have a greater cross-sectional   area 2. Its web has a greater cross-sectional   area 3. The inner faces of its flanges are  tapered  towards  the  web 4. The width of the flanges is always  much  greater  than  those of the S-shape 4