Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG General Subjects (Auxiliaries & Systems) (Set 11)

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Question 1 of 30

Hot water heaters used in potable water systems may have multiple heat sources, such as an electric heating element and a jacket water heated tube bundle. What is the primary purpose of such an arrangement?

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30 MCQs

#1 Hot water heaters used in potable water systems may have multiple heat sources, such as an electric heating element and a jacket water heated tube bundle. What is the primary purpose of such an arrangement? #2 Suppose the pressure switch used to control the "lead" potable water pump is set at 45 psig cut-in for pump start and 55 psig cut-out for pump stop. What would be an appropriate setting for the "lag" potable water pump? #3 Which of the following speed control devices is used strictly as a safety device to prevent prime mover damage and acts by shutting down the prime mover? #4 Which of the following statements is true concerning the application for an isochronous governor? #5 Which term represents the ability of a speed control governor to maintain prime mover speed without hunting? #6 What is meant by the term "dead band" as it applies to prime mover speed control governors? #7 The pressure of an operating hydraulic system, as indicated by a pressure gauge, is a result of the fluid flow overcoming __________. #8 Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's viscosity? #9 With an increase in temperature, the volume of hydraulic fluid __________. #10 Energy losses occurring in a hydraulic system are ultimately absorbed by the __________. #11 For the various sizes of tubing and wall thickness used in a hydraulic system, the inside diameter can be determined if it is remembered that the inside diameter equals the outside diameter less __________. #12 The determining factor for the strength of a flexible rubber hydraulic hose is the __________. #13 Strainers are commonly used in hydraulic systems to __________. #14 An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of __________. #15 An improperly maintained filter used in a hydraulic system can __________. #16 In application, which of the listed sealing devices is most similar to an O-ring? #17 Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the __________. #18 To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done? #19 A hydraulic fluid flow control circuit, controlling linear actuator speed during extension, with the pump operating at system pressure, is known as a __________. #20 A hydraulic fluid flow control circuit, used to control linear actuator speed during retraction, with the pump operating at above maximum pressure, is known as a __________. #21 If the device shown in the illustration is being used to control the output of an axial piston pump, when part "A" is moved to the right, then part "B" __________. Illustration GS-0039 #22 Plug valves installed in hydraulic systems are most suitable for use as __________. #23 Which of the listed pressure-control valves would be used in a hydraulic system to temporarily divert some, or all of the pump discharge until the additional flow was required? #24 Which of the listed pressure control valves would be used to permit the completion of one action of a hydraulic system before a second action would be permitted? #25 For which of the following reasons is a linear actuator fitted with a cushioning device? #26 Which of the following statements concerning the operation of a single-acting hydraulic ram is correct? #27 The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the __________. #28 Which of the listed components of a hydraulic system would enable the pump to be temporarily shutdown, and yet still provide an instantaneous source of hydraulic force? #29 A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________. #30 Which of the following statements describes the functions of a reservoir used in a hydraulic system?

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