Q613 - General Subjects, USCG prep certification 2026

Progress: 24% (23/94)

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1. In the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve, what statement is true concerning the pilot and main valvesNot learned 2. 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 __________.Not learned 3. Which of the drill sets listed would commonly be referred to as a “Jobbers Set”?Not learned 4. No two drills from differing drill sets are of the exact same size, with the exception of the drills measured as 0.25 inch. These two drills are the 1/4 inch and the __________.Not learned 5. If the speed of a drill is too great, the drill will __________.Not learned 6. Which material can be drilled at the highest speed?Not learned 7. To set the dividers to the proper radius, you should use a __________.Not learned 8. The lathe tools shown as figure "M" in the illustration are commonly known as __________Not learned 9. Which of the metals listed below can be cut with the highest operating lathe speed?Not learned 10. Reheating a hardened component to a temperature lower than the hardening temperature and then cooling it is known as __________.Not learned 11. What effect does preheating, concurrent heating, or post heating have on welding a joint?Not learned 12. When renewing spiral packing in a centrifugal pump stuffing box, after the packing is firmly seated, the packing gland nuts should be __________.Not learned 13. Which of the following statements is true regarding mechanical seals?Not learned 14. What could be the cause of water hammer in a steam heating system?Not learned 15. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by __________.Not learned 16. Which of the listed types of seals is used effectively for pumps handling toxic or highly flammable liquids that cannot be permitted to escape into the atmosphere?Not learned 17. Mechanical shaft seals used on water service pumps require lubrication of the seal faces to minimize deposits of foreign matter on those surfaces. Which of the following pressures and lubricants are required?Not learned 18. The primary function of a centrifugal pump volute is to __________.Not learned 19. Which of the following bilge pumping applications would most likely use a non-automated centrifugal pump under manual supervision?Not learned 20. If a centrifugal pump were continually operated with the discharge valve closed, the __________.Not learned 21. To prevent overheating and scoring of the shaft after repacking the stuffing box, which of the following procedures should be carried out?Not learned 22. The simplest method to use for determining if a centrifugal pump is operating as designed, is to ________.Not learned 23. A spur gear pump should be operated with the discharge valves __________.Not learned 24. Aftercoolers are used with air compressors to __________.Not learned 25. As an indication that an air compressor air intake filter needs to be replaced or cleaned, what statement is true?Not learned 26. Which of the following statements represents the proper procedural sequence for adjusting the metering rate of an in-line lubricator as used in a ship's service air system hose station? Assume that the pressure regulator has been properly set.Not learned 27. If a belt-driven reciprocating air compressor is operating at a lower than design displacement capacity (in cubic feet per minute), which of the following would be a cause?Not learned 28. If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?Not learned 29. With regard to the number of passes through the tubes of shell-and-tube heat exchangers, what statement is true?Not learned 30. Which of the following provisions for thermal expansion for shell-and-tube heat exchangers only requires a single tube sheet located at one end?Not learned 31. For a shell-and-tube heat exchanger, which tube pitch pattern would feature "see-through" lanes and would most easily allow external mechanical cleaning of the tubes?Not learned 32. What is meant by the term independent bilge suction?Not learned 33. What is an engine room bilge oily-water separator designed to do?Not learned 34. In order to facilitate separation of oil from an oily-water mixture in an oily-water separator, what statement is true concerning the flow pattern of the oily-water?Not learned 35. A constant pressure range is maintained in the potable water system of many vessels by using __________.Not learned 36. What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system?Not learned 37. 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?Not learned 38. In a two-stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?Not learned 39. While earlier designs of flash-type evaporators used a stand-alone, shell-and-tube air ejector condenser, most modern flash evaporators package the air ejector condenser in combination with the __________.Not learned 40. Regarding a freshwater generator of the reverse-osmosis type, what statement is true?Not learned 41. For the successful operation of a reverse osmosis freshwater generator, why is the high-pressure pump required to operate in the 750 to 1200 psig range for a discharge pressure?Not learned 42. In which of the following fresh water generators would an air ejector be unnecessary?Not learned 43. In order for a reverse osmosis fresh water generator to be able to overcome the osmotic pressure without damaging the spiral-wound membrane modules, the pressure must be controlled. What is the location of the pressure regulator?Not learned 44. An improperly maintained filter used in a hydraulic system can __________.Not learned 45. Strainers are commonly used in hydraulic systems to __________.Not learned 46. The determining factor for the strength of a flexible rubber hydraulic hose is the __________.Not learned 47. A flare-type tubing connector is used in the hydraulic hatch cover system and has developed a slight leak. To stop the leak, you should __________.Not learned 48. If the flow rate and pressurized oil from a variable capacity pump were supplied to the device illustrated, the __________Not learned 49. Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the __________.Not learned 50. To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?Not learned 51. With an increase in temperature, the volume of hydraulic fluid __________.Not learned 52. When normal operating pressure is applied to the hydraulic oil in a high-pressure system, the oil __________.Not learned 53. Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's viscosity?Not learned 54. If you attempt to tighten a leaking hydraulic fitting with pressure on the system, you will __________.Not learned 55. Purging air from a hydraulic system is necessary when __________.Not learned 56. What do hydraulically, servo-operated, automatic, changeover valves, used in a two-ram hydraulic steering gear accomplish?Not learned 57. When making welding repairs to a ship's structural member, why is it important to avoid weld faults?Not learned 58. When accomplishing welding repairs using the electric arc welding process, what statement is true concerning the characteristics of a good quality weld when welding a single-V butt joint?Not learned 59. When accomplishing welding repairs using the electric arc welding process, what statement is true concerning the characteristics of a good quality weld when welding a single-V butt joint?Not learned 60. Before welding repairs are performed to repair a crack, after drilling a 3/8-inch hole at each end of the crack, what is the correct procedure for welding overlays as an emergency crack stopper?Not learned 61. If a main propulsion shafting arrangement is such that no strut or strut bearing is required, what is an alternative name given to the propeller shaft, which is the section of shafting that the propeller is attached to?Not learned 62. Which of the following propulsor types represents the proper terminology for a Kort nozzle?Not learned 63. Which of the following propulsor types represents the proper terminology for a Voith Schneider drive?Not learned 64. As it pertains to the automatic electric brake of a horizontal electro-mechanical anchor windlass, what statement is true?Not learned 65. A horizontal electro-mechanical anchor windlass is equipped with two warping heads, two wildcats, two manual brake handwheels, two clutch control levers, and a multipoint lever-operated, pedestal-mounted controller. What statement is true as it pertains to the operation of the warping heads and wildcats?Not learned 66. As it pertains to raising and lowering an anchor with a horizontal electro-hydraulic or electro-mechanical anchor windlass, what statement is true?Not learned 67. Which of the following statements is correct concerning antifriction bearings installed on pumps?Not learned 68. A dented race in an antifriction bearing could be caused by __________.Not learned 69. After adding grease to a ball bearing with a hand-held grease gun, you should __________.Not learned 70. What is meant by the term toughness as it applies to a material?Not learned 71. What statement is true concerning the keel arrangements of a double bottomed ship?Not learned 72. While in dry-dock, what means are provided for completely draining the double bottom tanks in preparation for inspection?Not learned 73. What is the name of the opening in a bilge margin bracket that reduces the weight of the bracket without materially reducing its strength?Not learned 74. Even though bilge keels do provide some improvement in longitudinal strength at the bilge radius, what is the primary purpose of the bilge keels?Not learned 75. In terms of ship construction framing methods, which statement is true concerning the transverse framing system?Not learned 76. What statement is true concerning the plating meeting at the gunwales of a ship?Not learned 77. What is another name for the "collision" bulkhead?Not learned 78. What term is used to represent the bulkhead type used for tank boundary bulkheads?Not learned 79. What statement is true concerning the construction of watertight bulkheads?Not learned 80. On a ship with a continuously manned engine room, with a three-person watch rotation, what is the watch and rest period rotation?Not learned 81. What mode of heat transfer is associated with the transport of thermal energy from one location to another by fluid in motion?Not learned 82. What mode of heat transfer is associated with the transport of thermal energy within a body or between two bodies in direct contact?Not learned 83. What statement is true concerning heat transfer rates by the heat transfer mode of natural convection?Not learned 84. If Boyles' law describes the relationship between the pressure and volume of ideal gases, what statement is true?Not learned 85. What statement represents the ideal gas law?Not learned 86. In a vapor compression type refrigeration cycle, the refrigerant temperature decreases the most when passing through which system component?Not learned 87. What is one benefit of maintenance of proper air circulation in an air-conditioned cargo space?Not learned 88. The introduction of outside air to the air conditioning system is 95°F with a relative humidity of 70%. The air has been conditioned to 70°F with a relative humidity of 80%. Using the psychrometric chart, shown in the illustration, determine the quantity of moisture removed from one pound of the conditioned airNot learned 89. In a two-stage centrifugal air conditioning system such as the one illustrated, the liquid refrigerant passes from the condenser directly to what componentNot learned 90. To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, what should be done?Not learned 91. Which of the following guidelines is considered to reflect good design practices for shipboard steam heating systems?Not learned 92. Expansion tanks when used in a ship's low temperature 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?Not learned 93. What type of pump is invariably used as a circulator in a hydronic heating system?Not learned 94. What type of centrifugal fan is characterized by the highest operating efficiency?Not learned 95. The amount of HCFC-123 in a storage cylinder is measured by what means?Not learned 96. What is the physical state and pressure condition of refrigerant as it leaves a receiver in a typical refrigeration system?Not learned 97. What is the pressure and condition of the refrigerant entering the receiver of a refrigeration system?Not learned 98. The carbon seal ring of a refrigeration compressor crankshaft mechanical seal is held in position against the stationary ring face by using what device?Not learned 99. Refrigeration systems using forced air circulation evaporators have a tendency to cause rapid dehydration of produce in chill boxes. Which of the following will minimize this dehydration?Not learned 100. An arrow stamped on the valve body of a water regulating valve indicates which of the following?Not learned 101. In general, the thermal bulb for a thermal expansion valve used in a reciprocating air conditioning system is usually charged with what substance?Not learned 102. In a refrigeration system, the bulb for the thermal expansion valve is always located where?Not learned 103. In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device?Not learned 104. In a refrigeration system, what component is installed directly downstream of the thermal expansion valve?Not learned 105. Which of the listed operations will cause an automatically controlled refrigeration compressor to restart if the system features a pump-down cycle?Not learned 106. During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when only one of the evporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what valueNot learned 107. A refrigeration compressor used in a multi-box refrigeration system, is designed with six of its eight cylinders able to be controlled for variable load conditions. If all of the reefer boxes are currently feeding, what percentage of the total number of compressor cylinders will be loaded after start up?Not learned 108. Before charging a refrigeration unit, unless quick disconnect fittings are used, the refrigerant charging hoses should be prepared in what way?Not learned 109. Concerning the charging of refrigerant into a vapor compression refrigerating system, which of the following is true?Not learned 110. What must be done, at a minimum, before a system can legally be opened up for repairs while adhering to the prohibition against the venting of halogenated fluorocarbon refrigerants to the atmosphere?Not learned 111. What is the correct color-coding of refrigerant recovery cylinders regardless of the refrigerant contained within?Not learned 112. In a refrigeration system, the push-pull technique can be used for the recovery of the refrigerant in what state?Not learned 113. What is the color coding for a storage container of R-134a refrigerant?Not learned 114. In accordance with international MARPOL Annex I regulations and federal regulations under 33 CFR Subchapter O (Pollution), for vessels of 400 gross tons and above which are all required to carry an oily-water separator to process bilge slops, what is the design criteria in terms of maximum oil content of the overboard discharge?Not learned 115. In accordance with 33 CFR Subchapter O (Pollution), which discharge of oil or oily mixture to sea is permissible?Not learned 116. What statement is true concerning the ability of a line shaft bearing to adapt to shaft misalignment as the ship's hull flexes?Not learned 117. What statement is true concerning the arrangement of line shaft bearing housings?Not learned 118. Adsorption filters are not commonly used in steam turbine or diesel engine lubricating systems because they __________.Not learned 119. The greatest difference between absorbent and adsorbent filters is that absorbent filters __________.Not learned 120. Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analyzers, and monitors. What is the term that represents the rate of change of the velocity as a result of a part vibrating during its periodic or oscillatory motion?Not learned 121. 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?Not learned 122. 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?Not learned 123. Concerning governor speed droop, what statement is true?Not learned 124. Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?Not learned 125. 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?Not learned 126. What type of temperature transmitter would be most suitable for measuring running gear bearing temperatures in a diesel engine in that it requires no contact with the bearing?Not learned 127. In which lubrication application is a detergent type oil most likely to be used?Not learned 128. With respect to lubricating oils, what statement is true concerning viscosity and viscosity index?Not learned 129. Which statement is true concerning alkaline reserve as it applies to a lubricating oil?Not learned 130. Which of the following types of diesel engine lubricating oil filtration schemes must be equipped with a bypass relief valve to ensure that the engine bearings are not starved of oil if the filter element should become severely restricted or blocked?Not learned 131. Line "K" shown in the illustration is the __________Not learned 132. Which of the listed temperature sensors consists of finely coiled wire, such as platinum, where the resistance varies directly with temperature?Not learned 133. With a constriction type, differential head flow meter, which of the following would be an example of a primary device?Not learned 134. If an oil-in-water content monitor uses a lamp emitting light in the visible spectra in conjunction with a reference photocell and a sampling photocell, what is the operating principle upon which this oil-in-water content monitor works?Not learned 135. For a pneumatic transmission system for instrumentation purposes, if a pneumatic pressure indicator has a calibrated scale of 0 to 1000 psig, what would be the actual measured pressure if the transmitted pneumatic signal pressure to the indicator is 9 psig, assuming the industry standard of 3 to 15 psig is used for instrument air?Not learned 136. What type of liquid level indicator which senses head or pressure requires a supply of compressed air?Not learned 137. In the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve, what statement is true concerning the opening and closing forces acting upon the control diaphragmNot learned 138. In a closed-loop process control system featuring negative feedback, what is the function of the error detector within the controller?Not learned 139. What is another name for the control mode used in a process control system that uses two-point control?Not learned 140. On a ship with a periodically unmanned engine room, under what conditions must the propulsion console be continuously manned?Not learned 141. In accordance with 33 CFR Subchapter O (Pollution), which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?Not learned 142. The ability of a metal to be hammered, or rolled out is called its __________.Not learned 143. Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is trueNot learned 144. A box solenoid valve used in a multi-box refrigeration system is operated by electromagnetic action by what control device?Not learned 145. Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?Not learned 146. A 'centerline' depicted in a drawing or blueprint is represented by which of the figures shown in the illustrationNot learned 147. The components indicated as "7" and "8" as shown in the illustration, are known as the __________Not learned 148. Concerning the arrangement of equipment and associated hoses shown in the illustration, which statement is trueNot learned 149. Concerning transverse fixed tunnel thrusters, what statement is true?Not learned 150. The device shown in the illustration is a/an __________Not learned 151. Which of the devices shown in the illustration is designed for both inside and outside measurementsNot learned 152. What should be done if localized scoring is discovered on a pump shaft sleeve during routine maintenance inspection?Not learned 153. You are on a ship with a large slow speed main engine that operates an Unattended Machinery Space. When entering the main machinery space to conduct maintenance or a machinery space round, what should be done?Not learned 154. In examining a baseline vibration signature and the historical record of periodic vibration analyses, what must be considered for the evaluation of rotating machinery?Not learned 155. Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by which of the following?Not learned 156. Which of the following compressors would be used for a dead ship start-up of a ship's service diesel- generator on a motor ship?Not learned 157. Which of the following conditions occurs in the section labeled "F" of the device shown in the illustrationNot learned 158. Which of the following electrically operated refrigeration system valves would be most appropriate for use as a 2-position diverting hot gas bypass solenoid valveNot learned 159. Which of the following freshwater generators has an operating principle that employs the use of a semi-permeable membrane?Not learned 160. Which of the following freshwater generators has an operating principle that evaporates preheated sea water by causing it to undergo a pressure drop into a vacuum?Not learned 161. Which of the following propulsor types represents the proper terminology for electric propulsion where the drive motors are outside the ship's hull?Not learned 162. Which of the following refrigerants is normally classified as a low-pressure refrigerant based on a relatively high boiling point?Not learned 163. Which of the following is true concerning the class "D" air conditioning system shown in the following illustrationNot learned 164. In a forced-feed lubrication system, what statement is true concerning lube oil reservoir/sump residence time?Not learned 165. What is the function of device "B" shown in the illustrationNot learned 166. What is the function of device "C" shown in the illustrationNot learned 167. The function of the section labeled "C" in the device illustrated is to provide a/an __________Not learned 168. Given that valve "14" is the king solenoid valve, which of the following statements is trueNot learned 169. A horizontal electro-mechanical anchor windlass is equipped with two warping heads, two wildcats, two manual brake handwheels, two clutch control levers, and a multipoint lever-operated pedestal- mounted controller. What statement is true as it pertains to the operation of the windlass clutch control levers?Not learned 170. The hydraulic tubing installation shown as figure "D" is INCORRECT and will probably leak when in operation because the tubing __________Not learned 171. Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant chargeNot learned 172. In the illustrated refrigeration system, what is the proper name for the component labeled "A"Not learned 173. In the illustrated self-contained, internal-pilot, piston-operated temperature control valve, what statement is true concerning the pilot and main valvesNot learned 174. In the illustrated single zone HVAC system, what prevents the simultaneous flow of steam through the preheat coil and flow of chilled water through the cooling coilNot learned 175. In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the supply air duct thermostats controlling the preheater steam flow and the cooling coil chilled water flowNot learned 176. In the illustration, line "D" is a/an __________Not learned 177. The lathe tool shown as figure "N" in the illustration is commonly known as a __________Not learned 178. The lathe tool shown as figure "R" in the illustration would best be used to __________Not learned 179. Light and other forms of radiation can act as a means of transporting heat energy from one body to another. This radiative transport is different from conduction and convection in that it does not involve __________.Not learned 180. The line labeled "G", as shown in the illustration, would be identified as the ______Not learned 181. How would you prevent the rudder from moving while a repair is made on the steering system using the illustrated actuatorNot learned 182. What will happen if oil under pressure is supplied to the area noted as "N" on the vane in the illustrationNot learned 183. Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analyzers, and monitors. What is the term that represents the number of vibration cycles per unit time as a result of a part vibrating during its periodic or oscillatory motion?Not learned 184. Referring to the illustrated diagram for a central-station hookup for a hot water heating system, what statement represents the configuration of the systemNot learned 185. Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlledNot learned 186. Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is trueNot learned 187. In a refrigeration system, the valve shown in the illustration is used for what purposeNot learned 188. With regard to a ballast system associated with a dry cargo ship, what is the primary purpose of the fore peak and aft peak tanks?Not learned 189. With regard to ballast system operations associated with a dry cargo ship, what is meant by the term "deballasting"?Not learned 190. With respect to a "pusher" type azimuthing thruster, what statement is true?Not learned 191. When responding to a "right rudder" command from the amidships position, which parts of the steering gear system illustrated will be subjected to the highest pressureNot learned 192. When responding to a "right rudder" command from the amidships position, which part/parts of the steering cylinders illustrated will be subjected to the highest hydraulic pressureNot learned 193. The root opening dimension shown in the illustration is used to indicate the __________Not learned 194. The ruler indicated in the illustration is commonly referred to as a/an _________Not learned 195. 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 closedNot learned 196. As shown in figure "B" of the illustrated self-contained recovery unit connection diagrams, what is the recovery method supported by the connection schemeNot learned 197. As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output system block "DIGITAL CONTACT" representNot learned 198. As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output system block "DIGITAL OUTPUT" representNot learned 199. As shown in the illustrated refrigeration system piping schematic diagram with the various accessories and controls and equipped with an air-cooled condenser with high side pressure controls, what statement is true concerning the fan cycling control pressure switchNot learned 200. What statement represents the first law of thermodynamics?Not learned 201. Suppose the illustrated pneumatically operated diaphragm actuated control valve is used to control the fuel oil outlet temperature of a steam-heated heavy fuel oil heater by controlling the steam flow. What would be the result if there was a complete loss of pilot air being delivered to the valve actuatorNot learned 202. Suppose the illustrated self-contained, internal-pilot, piston-operated temperature control valve is part of the temperature control system for a steam-heated heavy fuel oil service heater for a steam boiler. If there was an increase in demand for fuel by the boiler, what statement correctly represents how the valve would initially respondNot learned 203. The term "oil foaming" in refrigeration practice, is used to describe what event?Not learned 204. What type of pump is shown in the illustrationNot learned 205. In the unit illustrated, the feedwater temperature is required to be increased to 165°F or greater and must exist at this temperature when leaving __________Not learned 206. A vessel is in compliance with federal regulations regarding the discharge of sewage by __________.Not learned 207. The safety heads of most large reciprocating compressors used in refrigeration systems are held in place by what means?Not learned 208. How is accidental flooding of the engine room bilges through the bilge system prevented?Not learned 209. The introduction of outside air to the air conditioning system is 90°F with a relative humidity of 60%. The air has been conditioned to 70°F with a relative humidity of 80%. Using the psychrometric chart, shown in the illustration, determine the quantity of moisture removed from one pound of the conditioned airNot learned 210. Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analyzers, and monitors. What is the term that represents the distance a mass travels in a given direction as a result of a part vibrating during its periodic or oscillatory motion?Not learned 211. During operating periods of a multi-box refrigeration system using a capacity-controlled compressor, when all of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston shown in the illustration will be at what valueNot learned 212. What is the physical state and pressure condition of refrigerant as it enters the condenser of a typical refrigeration system?Not learned 213. In a forced-feed lubrication system, what statement is true concerning lube oil reservoir/sump residence time?Not learned