SPECIMEN EXAMINATION FOR MASTER 



105 



24. SEAMANSHIP. 



In the sketch below is shown the 

 method employed for fastening a grab 

 rail to the shell plating of a lifeboat. 

 Why are more rivets employed for at- 

 taching the small plate to the shell than 

 for attaching the bracket to the small 

 plate? 



Switlon 'A'-'A' 



Describe the various methods em- 

 ployed to absorb rudder shocks and pre- 

 vent their being transmitted to the 

 steering machinery. 



Discuss briefly the effect of list, speed, 

 and rough weather on the draft of 

 vessels operating in shallow water. 



A weight of 12 tons is being lifted 

 with a three-fold purchase. Find the 

 tension on the hauling part, consider- 

 ing loss of efficiency due to friction as 

 10 percent at each sheave. 



Describe briefly the possible effects 

 of hugging the baaik in a vessel pro- 

 ceeding in a narrow channel. 



You are proceeding upstream in a 

 loaded vessel, with an easy flood tide, 

 and you have orders to dock starboard 

 side to at a dock lying on your own port- 

 hand. The face of the dock lies parallel 

 with the stream. How would you ma- 

 neuver your vessel to make the landing, 

 assuming that no towboat is available? 



In construing the load line regula- 

 tions, within what zone should a port 

 be regarded as lying when load line 

 regulations indicate that it lies on a 

 boundary between two zones? 



In determining whether a ship is 

 loaded below her load line: 



(a) What allowance for fuel con- 

 sumption may be made? 



(b) Is an allowance for fuel con- 

 sumption permitted for passenger ves- 

 sels? 



Taking a right-handed propeller 

 steamer from wharves, buoys, docks, 

 etc., how would you get your ship away 

 when lying head to tide, either side to 

 the wharf, and heading the right di- 

 rection? 



What is meant by the "pivoting 

 point" of a vessel? 



Where will the "pivoting point" usu- 

 ally be found in a vessel? 



Knowing the location of a vessel's 

 "pivoting point," state why experienced 

 ship handlers will observe the stern 

 while turning in constricted waters. 



Where machinery such as gears or 

 piston cranks, is exposed, what safety 

 measures are required by the Regula- 

 tions? 



Explain the effect of "bank cushion" 

 and "bank suction" on a vessel steam- 

 ing in a narrow channel. State how a 

 steamer should be handled when pro- 

 ceeding through a narrow channel in 

 order to avoid these effects. 



If your vessel's engine became dis- 

 abled in heavy weather, what steps 

 might you take to avoid rolling in the 

 trough of the sea? 



How would you turn a right-hand 

 screw vessel alongside a dock under her 

 own power? Vessel is lying starboard 

 side to dock and is to be turned port 

 side to dock, no wind or tide. 



Why is a vessel fitted with twin 

 screws turning outboard easier to ma- 

 neuver than a vessel with twin screws 

 turning inboard? 



In maneuvering ahead at low speed 

 is the rudder of a single screw vessel 

 or a single rudder on a vessel fitted 

 with twin screws more effective for 

 turning the vessel? Why? 



With a right hand single screw ship, 

 is it more advantageous to dock port or 

 starboard side to, no tide? Why? 



What entries are required in the of- 

 ficial log book with respect to the load 

 line and draft? 



A wire rope rove through two single 

 blocks with two parts at the mov- 

 ing block is used for a lifeboat fall. The 

 weight of the boat and its equipment is 

 5 tons, and the boat has a capacity of 

 100 persons. Compute the required 

 breaking strength for the wire rope 

 falls using the following factors. Show 

 all work. 



A safety factor of 6 is required for 

 boat falls by regulations. 



The weight of each person is con- 

 sidered 165 pounds by regulations. 



Friction loss of 10 percent at each of 

 the two sheaves. 



State the formula used to obtain the 

 tons per inch immersion (T. P. I.) of a 

 vessel in sea water. 



Where is the information concerning 

 the tons per inch immersion of a vessel 

 usually found? 



What consideration may make the 

 tons per inch immersion value in error 

 unless a correction is applied? 



