Pass Benchmark: 70% • Standard: USCG NMC / 46 CFR
USCG Engine General (Supplementary) (Set 6)
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Question 1 of 30
The air temperature associated with a direct reciprocating air conditioning plant is found to be too warm, and the compressor is not operating. A service check determines the compressor suction pressure to be above the normal cut-in point, with a normal head pressure, and high evaporator superheat. Which of the following could be the cause of this problem?
Browse Questions in Set 6
30 MCQs #1 The air temperature associated with a direct reciprocating air conditioning plant is found to be too warm, and the compressor is not operating. A service check determines the compressor suction pressure to be above the normal cut-in point, with a normal head pressure, and high evaporator superheat. Which of the following could be the cause of this problem? #2 Sludge may form in the crankcase of an air conditioning compressor as a result of what condition? #3 As shown in the illustrated LP centrifugal chiller high efficiency purge recovery unit piping schematic, what statement is true concerning the vacuum pump? See Illustration GS-RA-55
Illustration GS-RA-55: the U.S. Coast Guard has not released this illustration. #4 Expansion tanks when used in a ships hot water heating system may be of the open or closed type. In a closed type system, what would be the normal temperature range of the water? #5 Water hammer in a steam heating system can be caused by __________. #6 Which of the following guidelines is considered to reflect good design practices for shipboard steam heating systems? #7 Salt water ballast is to be discharged into the #6 port and starboard wing tanks. Which combination of valves, illustrated, must be opened, and which valves should be closed? GS-0139 #8 In order to take suction on the lube oil drain tank cofferdam with the bilge pump shown in the illustration, how many suction side valves must be open? GS-0042 #9 One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the __________. #10 The emergency bilge suction valve is typically used __________. #11 Accidental flooding of the engine room bilges through the bilge system is prevented by __________. #12 Which of the listed pumps, shown in the illustration, discharges directly to the fuel oil settling tanks of a diesel engine main propulsion plant? Illustration MO-0058 #13 Fuel oil is regularly transferred to the day tank in order to __________. #14 Fuel oil day tanks for diesel engines must be checked and cleaned at regular intervals in order to remove __________. #15 The depth of fuel oil in a tank is normally measured through the __________. #16 Standby or emergency diesel generator day tanks should always be kept full to reduce the possibility of __________. #17 Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to __________. #18 The rudder torque capacity of the four ram steering gear illustrated is rated at 44,210,000 inch-pounds with one power unit in operation. If the four ram system was able to be operated as a two ram system with both power units on line, what would be the available torque? GS-0067 #19 The device shown in the illustration is a/an __________. GS-0116 #20 If it is necessary to prevent the rudder from moving while a repair is made on the steering system using the illustrated actuator __________. GS-0116 #21 In the illustrated schematic, the device used to replace the six-way valve, as found on many older type steering gears, is the component labeled as __________. GS-0123 #22 Rudder position is shown on the bridge by the __________. #23 With respect to a lubricating oil's viscosity and the bearing loading characteristics at the points of lubrication, what statement is true? #24 Which statement concerning a lubricating oil's viscosity and bearing loading characteristics is true? #25 Greases used for most marine applications would have what National Lubricating Grease Institute (NLGI) grade? #26 A bearing using an oiling ring as a means of static oil feed must occasionally be serviced by removing the wear particles, grit, and moisture. How is this accomplished? #27 On a bearing using an oiling ring as means of static oil feed, unless adverse conditions would indicate otherwise, how often should the oil be completely changed at a minimum? #28 When any low pressure distilling plant is operated with less than the designed vacuum, the __________. #29 In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called __________. #30 The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as __________.
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