Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Subjects (Auxiliaries & Systems) (Set 22)
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Question 1 of 30
On disassembling a centrifugal pump for overhaul, the third engineer reports holes drilled axially in the back side of a single suction closed impeller. The reason for the these holes is which of the following?
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30 MCQs #1 On disassembling a centrifugal pump for overhaul, the third engineer reports holes drilled axially in the back side of a single suction closed impeller. The reason for the these holes is which of the following? #2 When renewing spiral packing in a centrifugal pump stuffing box, after the packing is firmly seated, the packing gland nuts should be __________. #3 When installing a mechanical shaft seal on a pump, it is important to ______. #4 Your centrifugal ballast pump is producing a pressure less than the designed discharge pressure. What could be the cause? #5 The shipyard has just reassembled an overhauled centrifugal pump. On testing, water is coming from the mechanical seal area. Which of the following are likely reasons for the leakage? #6 While making a round in the lower engine room you discover a leak in the suction pipe to the main salt water pump. How would proceed to correct this problem? #7 When opening a ballast pump for inspection, the wear ring clearance is found to be approaching maximum. Which of the following would be expected? #8 A spur gear pump should be operated with the discharge valves __________. #9 Coast Guard regulations concerning marine sanitation devices may be found in __________. #10 Marine sanitation devices installed on vessels must be certified by the __________. #11 Which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature? #12 What type of HVAC system is ideally designed to serve a large public space? #13 What type of HVAC system is characterized by poor air distribution and ventilation and low system heat loads? #14 What type of HVAC system is characterized by a having a split supply air stream, with one for cold air and the other for hot air? #15 What type of HVAC system is characterized by having control dampers in locations other than the outside air supply, outside air exhaust, and recirculation damper applications? #16 What type of pump is invariably used as a circulator in a hydronic heating system? #17 What statement is true concerning a one-pipe hydronic heating system? #18 It is absolutely essential that hydronic heating system hot water piping be kept free of air. Assuming that a system is initially properly filled with water, what is the primary source of air contamination? #19 Concerning cargo-hold dehumidification, what statement is true? #20 What statement is true concerning a liquid desiccant cargo-hold dehumidification system? #21 What statement is true concerning a liquid desiccant cargo-hold dehumidification system? #22 With regard to the cooling and heating coils and humidification and regeneration chambers of a liquid cargo-hold dehumidification system, what statement is true? #23 To prevent damage to dry cargoes, the cargo hold ventilation and dehumidification systems play a key role. In terms of the maintained dew point, what statement is true? #24 To determine the average cargo hold dew point temperature, at what location would the dew point be measured? #25 What temperature associated with the psychrometric properties of air is measured by an ordinary thermometer? #26 Where would you find a list of the firefighting equipment required on your vessel? #27 The duties of a chief engineer upon taking charge of the department include __________. #28 A Coast Guard engineer's license can be suspended or revoked for __________. #29 Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency? #30 In accordance with Coast Guard Regulations (46 CFR), it is the duty of the Chief Engineer to acquire and seal a sample of fuel oil received whenever fuel oil bunkers are taken. This sample must be preserved until __________.
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