16 



UNITED STATES COAST GUARD 



What is the purpose of the telemotor 

 equalizing valve and bypass valve in 

 the wheelhouse on vessels fitted with 

 this tj'pe steering apparatus? 



What devices, other than telemotors, 

 are used to control steering engines 

 from the pilot house? 



In the event that the pump room on 

 a tank vessel becomes flooded with oil, 

 what means must be provided for pump- 

 ing it out? 



When electric cable passes through a 

 watertight bulkhead, what equipment 

 must be provided and maintained in 

 good condition? When electric cable 

 passes through a fire-screen bulkliead. 

 what care is neecieo? 



In what condition is armored electric 

 cable required to be maintained? 



DescrilDe briefly a marine boiler and 

 precautions that deck officers should 

 bear in mind with respect to its opera- 

 tion. 



What precautions should be enforced 

 when men are working with pneumatic 

 or electric chipping hammers? 



What is the purpose of the fresh 

 water line on the load line markings? 



Where machinery, such as gears, pis- 

 ton cranks, or other hazards, is exposed, 

 what safety measures are required by 

 the Regulations? 



Name at least three types of engines 

 used on merchant vessels and state 

 briefly their characteristics with respect 

 to maneuvering the vessel, i. e., backing 

 power, starting and stopping, etc. 



On vessels fitted with power ventila- 

 tion, where may the switches be found 

 for shutting off the ventilation in the 

 event of an emergency such as a fire? 



What care should be taken of 

 steam deck machinery during freezing 

 weather? 



Describe reciprocating steam engines, 

 and state the usual method of connect- 

 ing them to the shaft when they are 

 used as main propulsion units. 



On vessels equipped with refrigera- 

 tion, other than small unit type re- 

 frigeration of not more than 20 cubic 

 feet capacity, what equipment is re- 

 quired to be provided so that men may 

 work on the machinery in the event of 

 leakage of the refrigerant? 



What is the purpose of the following : 



(a) Main circulating pump; 



(b) Main bilge and ballast pump; 



(c) Thrust bearing? 



Name the four following canvas 

 stitches and describe briefly the use of 

 each. 



^1 ^ e 5 ft ^ ^ "^iJ^u^^J^/^ 



(a) Which is longer, a No. 15 sail 

 needle or a No. 10 sail needle? 



(b) From what materials is canvas 

 made? 



What is meant by the phrase "reefing 

 a sail" or "taking a reef" in a sail? 



What precautions should be taken 

 when stretching tarpaulins to cover 

 hatches? 



A vessel in fresh water draws 23 

 feet. What does she draw in salt water, 

 using the scale below? 



