96 



UNITED STATES COAST GUARD 



The weld illustrated is known as 



The weld illustrated is known as 



The weld illustrated is kno\vn as a 

 type weld. 



The weld illustrated is known as 

 welding. 



How are pipes terminating at the 

 shell plating constructed in order to 

 minimize danger of the pipes being 

 cracked by blows or stress on the skin 

 plating? 



Where should shut-off valves be 

 located on piping to the shell? 



What is the objection to cast iron for 

 use in cocks and valves attached to a 

 ship's side? 



How is the stern bearing normally 

 lubricated on an ocean going vessel? 



What materials are used in fabricat- 

 ing stern tube bushings? 



How may it be determined if welding 

 electrodes (welding rod) are suitable 

 for use in construction or repair of 

 vessels? 



Why may cracks spread rapidly once 

 they have developed? 



On a tank vessel constructed with 

 twin longitudinal bulkheads, what ad- 

 vantage is gained by using the wing 

 tanks rather than the center tanks for 

 ballast? 



Describe the advantages of welded 

 ship construction with respect to re- 

 pairs of shell damage. 



What precautions must be taken with 

 respect to radiators and other heating 

 apparatus to avoid injury to persons 

 occupying the space? 



On passenger vessels, what are the 

 general requirements for rails? 



What are the advantages of a tank 

 in a vessel independent of the skin for 

 potable water storage? 



How often must propeller tail shafts 

 be withdrawn for examination? 



At the stern post : 



(a) What is the purpose of the 

 zinc plates usually fitted to a vessel? 



(b) When a ship is being painted, 

 should such plates be painted? 



How are hollow plated rudders usu- 

 ally treated to prevent internal cor- 

 rosion ? 



W^hen a vessel is drydocked, how may 

 you detect small leaks, not readily ap- 

 parent externally on a hollow plated 

 rudder? 



Do Coast Guard regulations cover 

 the maximum allowable clearance be- 

 tween propeller tail shaft and stern 

 bushings? 



How is the clearance between tail 

 shafts and bushings determined? 



How is the bossing about the tail 

 shaft of a ship usually fitted to prevent 

 jamming of rope between the boss and 

 the propeller? 



What inspection is mandatory by 

 regulation when alterations, repairs, or 

 operations involving riveting, welding, 

 burning, etc., are to be made in, or on 

 the boundaries of oil tanks, oil lines, or 

 oil heating coils? 



What is the maximum angle of ef- 

 ficiency for a rudder? 



What means must be provided to in- 

 sure that the maximum angle of ef- 

 ficiency for the rudder is not exceeded 

 when the wheel is put hard over? 



