SPECIMEN EXAMINATION FOR CHIEF MATE 



71 



Referring to the sketch : 



(a) With a gun tackle purchase 

 made fast to the hauling part of a 

 single whip as shown, how much weight 

 at "W" may be lifted with a force at 

 "F" of 100 pounds, allowing 10 percent 

 friction loss at each sheath? 



(b) To lift "W" 3 feet, how far 

 must the line at "F" be pulled? 



(c) What stress is put on the pad- 

 eye at "C" when lifting the weight? 



Slocks and Tackles 



In the selection of correct thickness 

 of grain shifting boards, what is the 

 governing factor? 



In the selection of the correct rec- 

 tangular cross section or diameter of 

 timbers to be used as shores for grain 

 shifting boards, what are the governing 

 factors? 



What size of wire rope and shackles 

 is the minimum allowed to be used for 

 staying grain shifting boards? 



Where must shores used for bracing 

 grain shifting boards be bridged? 



What action must be taken if the 

 drum of an electric winch rotates to pay 

 out the wire under the stress of a load 

 while the switch is in the "off" posi- 

 tion? 



What is the minimum thickness of 

 wood to be used for hatch boards on 

 weather deck hatches? 



What is the minimum number of tar- 

 paulins required for covering hatches, 

 and what is the minimum grade of the 

 material to be used? 



In a steel lifeboat, what parts of the 

 boat's structure give it longitudinal 

 strength ? 



What care must be taken when alumi- 

 num fittings are used on steel vessels in 

 salt water service? 



How do you rig an anchor buoy and 

 how should it be handled for safety and 

 efficiency when dropping or raising a 

 bower anchor? 



Describe the construction of the de- 

 tachable links used to join shots of 

 chain and the procedure of connecting 

 and disconnecting shots. 



Within what length of time should a 

 properly operating steering engine be 

 able to put the rudder from hard over 

 on one side to hard over on the other 

 side with vessel going full speed ahead? 



In the event of a fireroom fire, what 

 provisions are available to shut off the 

 fuel pimips? 



In anchoring in deep water, what 

 precaution should be taken? 



Why must you avoid tvnsts in the 

 chain between the wild cat and the an- 

 chor, when the anchor is hove tight and 

 in the hawse pipe? 



How is the wear on a shot of chain 

 cable determined? 



How should the bitter end of anchor 

 cables be secured in the chain locker 

 and why should it be so secured? 



When a vessel is moored with two an- 

 chors down, how may she insure swing- 

 ing the right way with the change of 

 the tide? 



What could be the result of swinging 

 the wrong way on a vessel moored with 

 two anchors in a tideway? 



If a draft of 1,000 pounds of cargo 

 be lifted with the sling sketched here, 

 what is the compressive stress on the 

 spreader shown? 



