Q715 - Motor Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. At a given pressure, erosion of steam piping and machinery will be minimized by utilizing __________.Not learned 2. The greatest resistance to heat transfer from the fireside to the waterside of a water-tube boiler takes place in the __________.Not learned 3. The bore of a diesel engine cylinder describes the __________.Not learned 4. The cubic inch (or liter) displacement of a cylinder is determined by the diameter of the piston and the __________.Not learned 5. Opposed-piston diesel engines are classified as __________.Not learned 6. The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its __________.Not learned 7. The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as __________.Not learned 8. The average pressure exerted on a piston during each power stroke is termed __________.Not learned 9. In a diesel engine, after ignition of the fuel occurs, but before the piston reaches TDC, there is little change in the cylinder __________.Not learned 10. A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.Not learned 11. Theoretical perfect combustion in a diesel engine yields by-products of __________.Not learned 12. Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the __________.Not learned 13. The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the __________.Not learned 14. As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?Not learned 15. Diesel engines are classified as reciprocating internal combustion engines because they __________.Not learned 16. The diesel engine shown in the illustration is a __________Not learned 17. In the operating cycle of a four-stroke cycle diesel engine, blow down to exhaust manifold pressure must occur before the piston begins the exhaust stroke to minimize __________.Not learned 18. The start of fuel oil injection into the cylinder of a four-stroke cycle diesel engine occurs during the __________.Not learned 19. The #3 piston shown in the illustration is on the __________Not learned 20. The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period. What else will influence the pressure rise?Not learned 21. The purpose of an oil mist detector in a main propulsion diesel engine is to warn of __________.Not learned 22. One advantage of dry cylinder liners used in a diesel engine is the __________.Not learned 23. One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the __________.Not learned 24. What may cause a diesel engine cylinder head to crack?Not learned 25. The greatest turbulence in a diesel engine cylinder is created by the __________.Not learned 26. Open combustion chambers are designed to __________.Not learned 27. The purpose of the energy cell, or air cell, is to __________.Not learned 28. In a diesel engine, which type of wrist pin is fixed to the small end of the connecting rod and moves in the piston?Not learned 29. Barrel face, taper face, grooved, and chrome plated are all types of diesel engine __________.Not learned 30. Which of the bearings listed below is most widely used for the main and connecting rod bearings of a modern high-speed diesel engine?Not learned 31. Bearing "crush" as applied to diesel engine main bearings, will result in __________.Not learned 32. The proper location for journal bearing oil grooves is __________.Not learned 33. A characteristic of a bearing material which permits small dirt particles to become embedded in the bearing surface is __________.Not learned 34. The load is always placed on the lower half of the main bearings in a __________.Not learned 35. The most critical time for any bearing with regards to diesel engine lubrication is during __________.Not learned 36. The most crucial time for any bearing with regards to diesel engine lubrication is __________.Not learned 37. The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?Not learned 38. Camshafts are usually driven by timing gears or __________.Not learned 39. The use of push rods becomes necessary in a diesel engine when __________.Not learned 40. The valve stem expansion associated with engine warm-up is allowed for by the __________.Not learned 41. Which of the listed design features is found in an exhaust valve and NOT in an intake valve?Not learned 42. During diesel engine warm-up, which type of valve lash adjuster compensates for the change in length of the exhaust valve stem?Not learned 43. The principal characteristic of an isochronous governor is it will __________.Not learned 44. The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by __________.Not learned 45. A main propulsion diesel engine is normally shutdown by __________.Not learned 46. What type of temperature transmitter would be most suitable for measuring diesel engine exhaust and boiler stack temperatures and generates its own electromotive force?Not learned 47. The cetane number is the index used to measure a fuel oil's __________.Not learned 48. A mixture of 45% cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel oil. The sample can be described as having a/an __________.Not learned 49. The ignition quality of diesel fuel becomes LESS critical as __________.Not learned 50. When running a large, dual fuel, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching from heavy fuel oil to diesel oil?Not learned 51. Maintaining the proper fuel oil temperature will result in __________.Not learned 52. Injection pressure in a common rail fuel system is controlled by __________.Not learned 53. What is the primary purpose of a fuel injection system, besides metering and atomizing fuel?Not learned 54. Differential needle valves used in fuel injectors are directly closed by __________.Not learned 55. Why must fuel droplets injected into a diesel engine cylinder have adequate penetration?Not learned 56. Fuel oil penetration into the cylinder of a diesel engine is __________.Not learned 57. What effect does proper atomization of fuel have in a diesel engine combustion chamber?Not learned 58. What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?Not learned 59. Fuel injector nozzles are usually of the multi-orifice type with the number and placement of the holes arranged according to the __________.Not learned 60. The amount of fuel delivered by a unit injector is controlled by the __________.Not learned 61. In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward stroke of the plunger depends on __________.Not learned 62. What is the purpose of the "window" installed in the housing of an individual jerk pump?Not learned 63. What is the purpose of the delivery check valve used in a diesel fuel injection jerk pump?Not learned 64. As shown in the illustration of the fuel injection pump, the component labeled "N" would be identified as the __________Not learned 65. The time between injection and ignition of the fuel is known as __________.Not learned 66. The control rack to a unit injector regulates fuel delivery by __________.Not learned 67. A diesel engine should use which type of lubricating oil?Not learned 68. The TBN value of diesel engine lube oil refers to its ability to __________.Not learned 69. A 'Blotter test' is a test performed on the lube oil of a diesel engine which can determine ______.Not learned 70. Which of the following test indicators should be considered the most significant factor in determining as to whether or not a diesel-generator's lube oil should be drained and renewed?Not learned 71. If the analysis of used lube oil indicates a high content of iron particles, this could indicate __________.Not learned 72. A decrease in the flash point of diesel engine lube oil indicates the lube oil has become __________.Not learned 73. Which of the following devices is normally provided to prevent oil starvation in a diesel engine lubrication system utilizing the "full flow" principle?Not learned 74. Lube oil pumps taking suction from the sump of most small marine engines are usually __________.Not learned 75. The lube oil cooler is located after the lube oil filter in order for __________.Not learned 76. On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by __________.Not learned 77. Proper lubrication of the main bearings is more easily obtained in a single acting four-stroke cycle diesel engine than in a single acting two-stroke cycle diesel engine because __________.Not learned 78. Auxiliary diesel engines can be automatically shut down as a result of __________.Not learned 79. A spring-loaded relief valve is located on some lube oil filters in full flow systems to __________.Not learned 80. What type of engine lubrication oil filter system sends filtered oil directly to the high-pressure supply gallery?Not learned 81. Most large main propulsion diesel engines use a duplex lube oil strainer to __________.Not learned 82. Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?Not learned 83. If a particular liquid has a specific gravity of 0.96 kg/dm3 at 77°F, what will be the specific gravity of the liquid, as determined from the graph shown in the illustration, if the temperature is increased to 167°FNot learned 84. A large, low-speed, main propulsion diesel engine uses sea water to directly cool the __________.Not learned 85. Reduction gear lube oil temperatures for keel cooler installations are generally __________.Not learned 86. Which of the following statements is true concerning a main diesel engine oil cooler?Not learned 87. In a naturally aspirated diesel engine, the volume of air intake is directly associated with engine __________.Not learned 88. In a naturally aspirated diesel engine, the volumetric efficiency of the intake air charge is mainly influenced by the __________.Not learned 89. An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.Not learned 90. Cooling the intake air supplied to a diesel engine will __________.Not learned 91. The power consumed during the scavenging process of a diesel engine is known as the _______.Not learned 92. On an opposed-piston engine, which of the listed operating conditions will result from increasing the lower crank lead?Not learned 93. The process of scavenging a two-stroke cycle diesel engine serves to __________.Not learned 94. Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished __________.Not learned 95. In a Roots-type rotary blower, the volume of air delivered is directly proportional to __________.Not learned 96. Which of the designs listed will keep the lobes from making contact in a Roots-type blower?Not learned 97. Which of the turbocharging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?Not learned 98. In a turbocharger, inlet air velocity is increased in the __________.Not learned 99. What is the function of the after coolers installed in the diesel engine air intake system?Not learned 100. Aftercooling of a turbocharged diesel engine will result in _________.Not learned 101. In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in __________.Not learned 102. The average exhaust temperature of a two-stroke cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke cycle diesel engine at equal loads because __________.Not learned 103. Exhaust pipes for separate main propulsion diesel engines can be combined only when __________.Not learned 104. The exhaust system for a turbocharged diesel engine functions to ________.Not learned 105. The formation of carbon monoxide in diesel exhaust gases is reduced by __________.Not learned 106. Casing drains may be required on a waste heat boiler gas passage side to __________.Not learned 107. The water in an auxiliary boiler should be tested for chloride content to determine __________.Not learned 108. The most common cause of scale formation in an auxiliary boiler is __________.Not learned 109. Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?Not learned 110. Starting systems for large, direct reversing, main propulsion diesel engines are usually __________.Not learned 111. The pilot valves in an air pilot starting system for a two-stroke cycle, direct reversing, main propulsion diesel engine are operated by either a ported distributor disc or a/an __________.Not learned 112. Starting air check valves are held firmly on their seats by __________.Not learned 113. Air motors used for starting some auxiliary diesel engines are generally the type known as __________.Not learned 114. Which internal combustion engine starting system uses a vane type fluid motor?Not learned 115. In addition to the main starting air compressor, another air compressor, driven by a separate power source, is installed to __________.Not learned 116. A two-stroke cycle diesel engine requires less starting air than a four-stroke cycle diesel engine, of equal displacement, because the two-stroke cycle diesel engine ______.Not learned 117. An accumulator used in a hydraulic starting system is generally located between the __________.Not learned 118. Which type of starter motor is sometimes utilized in a diesel engine hydraulic starting system?Not learned 119. When an engine fitted with a hydraulic starting system starts up, the starter is protected from the higher speed of the engine by ________.Not learned 120. Auxiliary diesel engine electric starting motors use __________.Not learned 121. Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions will be made easier by __________.Not learned 122. When starting a diesel engine at temperatures below 70°F, the frictional resistance to turning will be __________.Not learned 123. Which of the listed diesel engine starting systems is most susceptible to difficulties in cold weather?Not learned 124. With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the __________.Not learned 125. Starting aids, such as glow plugs, are usually installed on __________.Not learned 126. A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and the speed remaining below normal. The probable cause is __________.Not learned 127. The anchor handling vessel to which you are assigned is fitted with generator drive engines of the type shown in the illustration. In terms of operating cycle and cylinder configuration, what statement is trueNot learned 128. A main propulsion diesel engine on your ship docking tug has experienced a safety shutdown due to high lubricating oil temperature. What is the appropriate response?Not learned 129. A Bendix drive starting motor disengages the drive gear from the flywheel by __________.Not learned 130. Which of the combustion chambers shown in the illustration is referred to as an "energy cell" used in some small diesel enginesNot learned 131. Component "U" of the diesel engine shown in the illustration is called the __________Not learned 132. Under what condition would valves "4" and "5", as shown in the illustration, be closedNot learned 133. On the cylinder indicator diagram illustrated, the maximum rise in pressure occurs during the period labeled as ______Not learned 134. Device "E" shown in the illustration is known as the __________Not learned 135. Diesel engine closed, recirculating cooling water systems are particularly prone to cavitation corrosion/erosion. Which of the listed cooling system/engine components has surfaces in contact with the coolant that are most susceptible to this type of corrosion and erosion?Not learned 136. The diesel engine component labeled "5", shown in the illustration is known as the __________Not learned 137. The diesel engine connecting rods shown in the illustration are distinctively named __________Not learned 138. In the diesel engine shown in the illustration, which of the following statements is trueNot learned 139. In a diesel engine starting motor equipped with a Bendix drive, the pinion moves and meshes with the flywheel ring gear due to __________.Not learned 140. If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase __________.Not learned 141. The diesel engine wrist pin in the illustration is indicated by the component labeled __________Not learned 142. The diesel generator set drive engines on your vessel are protected with heavy-duty oil bath air cleaners. The oil within these air cleaners should be periodically replaced in accordance with manufacturer recommendations. What statement best describes when it would be appropriate to deviate from the recommended frequency?Not learned 143. In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by __________Not learned 144. In the engine shown in the illustration, the part labeled "W" is cooled by __________Not learned 145. What event triggers the end of the steady combustion period in a diesel engine?Not learned 146. The exhaust ports shown in the illustration are initially uncovered in figure __________Not learned 147. On which of the following auxiliary boiler types would soot blowers be equipped for maintaining heat transfer efficiency?Not learned 148. Which of the following is a benefit of the common rail fuel injection system?Not learned 149. Which of the following represents the diesel engine camshaft shown in the illustration and its relative rotating speedNot learned 150. Which of the following statements is correct concerning the operating function of the governor shown in the illustrationNot learned 151. Which of the following statements represents the function of the plunger flange labeled "A" shown in the illustrationNot learned 152. Which of the following statements is true concerning the diesel engine cylinder head and valve mechanism shown in the illustrationNot learned 153. Which of the following viscosity scales measures kinematic viscosity?Not learned 154. A four-stroke eight cylinder in-line medium-speed diesel engine has a firing order of 1-5-2-6-8-4-7-3. If No.4 piston is at TDC and firing, how many degrees of crankshaft rotation will occur when No.5 piston reaches TDC and fires?Not learned 155. The fuel injector shown in the illustration is opened by fuel pressure acting upward on __________Not learned 156. What is the function of the device labeled "3" shown in the illustrationNot learned 157. The gear drive, shown in the illustration, can have the backlash determined best by using a __________Not learned 158. As a general rule, what would be the recommended operating water jacket outlet temperature range for medium-speed marine diesels setup with closed treated fresh water cooling systems and fitted with vented expansion tanks?Not learned 159. The harbor tug to which you are assigned is fitted with 4-stroke cycle, 6-cylinder in-line diesel generator sets. Using the chart shown in the illustration, what is the firing order of the enginesNot learned 160. Honing of a cylinder liner is performed to retain a certain amount of lubricating oil which reduces the wear on the piston rings and cylinder liner. A two-step honing process consists of pre-honing and __________.Not learned 161. In the illustration, the intake valve closes at what point on the four-stroke cycle engine diagram shownNot learned 162. In the illustration shown, moving the component labeled "E", further to the left, will result in __________Not learned 163. The instrument shown in the illustration would be used on a diesel engine to __________Not learned 164. Which letter represents the top deck (valve) cover of the engine shown in the illustrationNot learned 165. The lube oil strainer shown in the illustration is used on the reduction gear of a mid-size diesel engine. The strainer elements consist of __________Not learned 166. Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?Not learned 167. After a main diesel engine on your vessel has experienced a safety shutdown due to excessive crank-case pressure, why is it important to wait 2 hours before opening the crankcase to investigate the cause of the trip?Not learned 168. A multi-orifice fuel injection nozzle is usually used with which of the listed types of combustion chamber?Not learned 169. The vessel to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If propulsion control functions perfectly from the engine room control station, but will not function at all from any of the remote stations, which of the following system faults best accounts for these symptomsNot learned 170. When operating the HFO purifiers in "parallel", as shown in the illustration __________Not learned 171. The parts labeled "I" and "II", shown in the illustration are respectively identified as the __________Not learned 172. The piston pin shown in the illustration should be classified as __________Not learned 173. The piston shown in the illustration is a __________Not learned 174. The pneumatic propulsion control system used on your vessel uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper techniqueNot learned 175. The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________Not learned 176. Most practical high speed diesel engines today operate on a cycle which is a combination of the Diesel and Otto cycles. In this process, compression ignition __________.Not learned 177. Pre-combustion chambers differ from turbulence chambers in that pre-combustion chambers __________.Not learned 178. Pre-combustion chambers and energy cells in high-speed, small bore diesel engines all serve to increase ________.Not learned 179. Pre-combustion chamber engines inject fuel into an antechamber located in the cylinder wall or cylinder head. What is the antechamber referred to when the injection nozzle is located in the main combustion chamber, outside of the antechamber?Not learned 180. You are preparing to change the oil of the speed control governor on one of the main propulsion diesel engines on your vessel. What statement is true concerning the draining and flushing procedures?Not learned 181. While preparing an engine for departure, the engineer notices water coming from both the waste heat boiler and turbocharger drains. Which of the following could be the cause?Not learned 182. The pressure-volume diagrams illustrated are of four internal combustion engine cycles. Which one represents the theoretical diesel cycleNot learned 183. What prevents the thrust bearing blocks shown in the illustration from rotating within the housingNot learned 184. While proceeding in open waters to a ship requiring docking assistance, one of the main engines on your ship-docking tug overheats. The high jacket water temperature alarm sounds, the freshwater thermometers indicate out of range (high), and the expansion tank level sight glass indicates out of range (high) with vapor bubbles forming and escaping through the vent. What is the appropriate initial response?Not learned 185. Regarding the turbocharger shown in the illustration, the part labeled "B" would be attached to the __________Not learned 186. The river push boat to which you are assigned is fitted with generator engines as partly shown in the illustration. What statement is true concerning the cylindersNot learned 187. The rocker arms of the diesel engine shown in the illustration are indicated by __________Not learned 188. When rolling over a main engine on your vessel prior to starting with the cylinder test valves open to expel any fluids accumulated within the cylinders, a rather large amount of water is discharged. What is the appropriate response?Not learned 189. The vessel to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. Assume that the vacuum between the air filter and the turbocharger blower inlet is 12" of water column (negative with respect to atmospheric pressure) when the engine is running at 50% of maximum, continuous rated load. What will happen to the suction vacuum when the load is increased to 100% of maximum continuous rated loadNot learned 190. The section of the turbocharger which would be connected to the aftercooler inlet is labeled __________Not learned 191. Which segment of the two-stroke cycle engine diagram shown in the illustration represents 'supercharging'Not learned 192. Which segment of the two-stroke cycle engine diagram shown represents the power strokeNot learned 193. As shown in the illustration of the fuel injection pump, the function of the area designated as "G" is to __________Not learned 194. In terms of the diesel fuels burned in auxiliary and main propulsion diesel engines onboard vessels, which of the listed fuel properties would be most critical to consider when transferring and forwarding fuel in extremely low ambient temperature conditions?Not learned 195. Which of the terms listed below represents the speed at which the natural period of vibration of a shaft or other machine part is in synchronism with the power impulses?Not learned 196. The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1 mm. Which of the following conditions is indicated and what steps should be taken, if anyNot learned 197. Which type of diesel engine fuel nozzle is shown in the illustrationNot learned 198. The unit of measure expressed as centistokes (cSt) is a measure of what fuel property?Not learned 199. The Wartsila 64 engine is equipped with automatic backflushing lube oil filter systems. These type of filtration systems require __________.Not learned 200. What is the approximate fuel pressure in a common rail fuel injection system?Not learned 201. In the diesel engine illustration provided, which of the given choices indicate rocker arm assembliesNot learned 202. In an engine with a common rail fuel injection system, the amount of fuel delivered to the cylinder is controlled by __________.Not learned 203. Which of the following exhaust gas emissions from an LNG fueled diesel engine is the most potent greenhouse gas?Not learned 204. Of the various components of LNG (Liquefied natural gas) and CNG (Compressed natural gas) which of the following comprises 90 percent of the gas?Not learned 205. Which of the following statements is correct concerning the operating function of the governor shown in the illustrationNot learned 206. Which segment of the two-stroke cycle engine diagram shown in the illustration represents the exhaust eventNot learned