Q730 - Motor Plants, USCG prep certification 2026

Progress: 24% (23/94)

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1. The device shown in the illustration is a __________Not learned 2. Poor combustion in a diesel engine can be caused by __________.Not learned 3. On a diesel-propelled vessel operating with constant slip what is the effect on fuel consumption with an increase in shaft RPM?Not learned 4. Which of the following statements concerning the factors affecting ignition delay is correct?Not learned 5. The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the __________.Not learned 6. The purpose of an oil mist detector in a main propulsion diesel engine is to warn of __________.Not learned 7. Which of the following problems could develop due to the accumulation of oil vapors in the crankcase of a diesel engine?Not learned 8. If a crankcase explosion due to a hot spot were to occur, the size of the explosion is dependent on which of the following?Not learned 9. Which of the following oil mist to air ratios would most likely lead to the most severe crankcase explosion?Not learned 10. After stopping a diesel engine with a high main bearing temperature, what is the time one needs to wait before a diesel engine crankcase can be opened?Not learned 11. Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?Not learned 12. The lower water seal on a diesel engine wet cylinder liner must allow for liner axial movement. This seal is most commonly a __________.Not learned 13. Which statement about diesel engine combustion is true?Not learned 14. Ring groove inserts are occasionally used on aluminum alloy pistons to __________.Not learned 15. In an auxiliary diesel engine, one reason for knurling the piston skirt is to __________.Not learned 16. According to the illustration, which of the following is trueNot learned 17. The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by __________.Not learned 18. In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?Not learned 19. Low compression pressure in a diesel engine can be caused by __________.Not learned 20. Piston cooling fins are located __________.Not learned 21. Trunk type diesel engine pistons are effectively cooled when heat is __________.Not learned 22. Worn main bearings will cause the compression ratio of a diesel engine to __________.Not learned 23. A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exposed bronze. The white coloring indicates __________.Not learned 24. The valve cam slope angle determines the __________.Not learned 25. When two cams of the same diameter, one with tangential flanks and the other with convex flanks are compared, the cam with tangential flanks will cause___________.Not learned 26. The intake and exhaust valves used in a diesel engine are returned to their seats by __________.Not learned 27. If there is a 'clicking' sound in the valve compartment of a diesel engine, the cause may be __________.Not learned 28. Excessively worn, or polished ends on a diesel engine valve spring, indicate __________.Not learned 29. Bouncing of the valve gear in a diesel engine can be caused by __________.Not learned 30. In a four-stroke cycle diesel engine, badly worn intake valve guides can cause excessive __________.Not learned 31. Worn cylinder head valve seats in a diesel engine will cause __________.Not learned 32. Worn diesel engine intake valve guides can result in __________.Not learned 33. When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will be indicated?Not learned 34. In diesel engines, hydraulic valve lifters are used to __________.Not learned 35. Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open __________.Not learned 36. The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by __________.Not learned 37. Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at __________.Not learned 38. A large change in ambient temperature or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the __________.Not learned 39. If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will __________.Not learned 40. If the speeder spring of a main propulsion diesel engine governor breaks while operating at full load, the engine RPM will _________.Not learned 41. A diesel-generator governor is hunting. After changing the oil, the governor is flushed and the compensation needle valve is adjusted, but the hunting persists. You should NOW __________.Not learned 42. Governor hunting is caused by __________.Not learned 43. If the operating speed of a diesel engine increases without an apparent change in the engine control settings, you may suspect a __________.Not learned 44. The overspeed trip installed on most diesel engines will stop the engine by shutting off the __________.Not learned 45. An engine is equipped with the overspeed trip similar to that shown in the illustration. The throw out weight is designed to run at 900 RPM and trip out at 10% overspeed. However, the overspeed trip is currently activating at 930 RPM. In order to correct this problem, __________Not learned 46. Diesel fuel oil having a low cetane rating can result in __________.Not learned 47. Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount?Not learned 48. You are onboard a vessel with a slow-speed crosshead type engine. The fuel just received has a significantly lower sulfur content than the previous bunkers. Which of the following would be a concern due to the reduced sulfur content?Not learned 49. Injection pressure in a common rail fuel system is controlled by __________.Not learned 50. Problems with the diesel engine fuel injection pump are usually caused by __________.Not learned 51. Which of the following problems is the main source of fuel pump and injection system malfunctions?Not learned 52. Differential needle valves used in fuel injectors are directly closed by __________.Not learned 53. Carbon deposit build up on the injection nozzle orifice is least likely to occur when using which type of fuel injector nozzle?Not learned 54. The amount of fuel delivered by a unit injector is controlled by the __________.Not learned 55. You are testing a closed fuel injection nozzle using a nozzle tester. A pressure slightly less than design valve opening pressure is applied. If no fuel appears at the spray tip, the __________.Not learned 56. Heat damage to fuel injection nozzles can be prevented by avoiding __________.Not learned 57. When a fuel injection nozzle overheats, which of the problems listed can be expected?Not learned 58. What is the purpose of the "window" installed in the housing of an individual jerk pump?Not learned 59. As shown in the illustration of the fuel injection pump, the component labeled "N" would be identified as the __________Not learned 60. When disassembling or assembling an injection pump plunger and barrel you should _________.Not learned 61. Surface irregularities, such as erosion and pitting on injection pump plungers, will __________.Not learned 62. Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires __________.Not learned 63. Uneven bolt tightening during the installation of a fuel injection pump can result in __________.Not learned 64. Injection lag in a diesel engine may be caused by __________.Not learned 65. Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should __________.Not learned 66. The time between injection and ignition of the fuel is known as __________.Not learned 67. High firing pressures and a low exhaust temperature in a diesel engine may result from __________.Not learned 68. One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is 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. Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because __________.Not learned 72. If the analysis of used lube oil indicates a high content of iron particles, this could indicate __________.Not learned 73. A decrease in the flash point of diesel engine lube oil indicates the lube oil has become __________.Not learned 74. Lube oil in the fresh water cooling system of a diesel engine may result from a __________.Not learned 75. What type of engine lubrication oil filter system sends filtered oil directly to the high-pressure supply gallery?Not learned 76. A dirty lube oil strainer can result in __________.Not learned 77. In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the __________.Not learned 78. Which of the following conditions is indicated by the presence of water in the scavenging air receiver?Not learned 79. An operating diesel engine that suddenly loses power, is due to a/an __________.Not learned 80. A sudden power loss from a turbocharged and aftercooled diesel engine is an indication of a/an __________.Not learned 81. Which condition indicates the air side fouling of an aftercooler on a turbocharged diesel engine?Not learned 82. High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by __________.Not learned 83. A diesel engine emits blue exhaust smoke as a result of __________.Not learned 84. Which of the couplings listed is normally not repairable, and is usually replaced if completely damaged?Not learned 85. Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or __________.Not learned 86. When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect __________.Not learned 87. A diesel engine may fail to start when being cranked, due to __________.Not learned 88. Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustrationNot learned 89. In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the __________.Not learned 90. Hydraulic starters are installed on many lifeboat diesel engines instead of comparable air start systems, because __________.Not learned 91. Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must __________.Not learned 92. The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an __________.Not learned 93. Auxiliary diesel engine electric starting motors use __________.Not learned 94. In a Bendix starter drive, the pinion engagement with the flywheel ring gear is initiated by __________.Not learned 95. Which of the following operating characteristics of the Bendix drive friction clutch is associated with a Bendix drive starter?Not learned 96. Which of the following effects will excessively cold lube oil have on the operation of a diesel engine?Not learned 97. If an auxiliary diesel engine equipped with an electric starting system cranks very slowly after repeated attempts to start, the cause could be a/an __________.Not learned 98. On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridge indicates __________.Not learned 99. One cause of diesel engine surging can be a result of __________.Not learned 100. During main engine performance testing it is noticed that the firing pressure of one cylinder is higher than the average, but cylinder compression pressure is normal. Which of the following would most likely be the cause?Not learned 101. During main engine performance testing it is noticed that one cylinder has firing and compression pressures lower than average. Which of the following would most likely be the cause?Not learned 102. During main engine performance testing it is noticed that the firing pressure in one cylinder is lower than the average, but cylinder compression pressure and fuel pump delivery rate are normal. Which of the following would most likely be the cause?Not learned 103. According to the illustration, which of the following is trueNot learned 104. When analyzing indicator card diagrams you are calculating the work output from the cylinder by obtaining the area within the curve of what type of diagram?Not learned 105. In the auxiliary diesel engine, shown in the illustration, the __________Not learned 106. While bunkering heavy fuel, what quick/easy test can one perform onboard to determine the compatibility of 'old' with 'new' fuel?Not learned 107. Catalytic fines comprised of aluminum oxide and/or silicon dioxide are a common contaminant of residual fuels. Which diesel engine components would be most affected by catalytic fines in fuel?Not learned 108. The most common contaminate of governor hydraulic fluid is __________.Not learned 109. In the common rail system, excessive pressure in the header may be caused by __________.Not learned 110. Crankcase explosions in propulsion diesel engines can result from which of the following?Not learned 111. Both crosshead type and trunk type lubricating oil are received onboard a vessel. These two oils cannot be interchanged due to which of the following reasons?Not learned 112. The device shown in the illustration is classified as a/an __________Not learned 113. The diesel engine shown in the illustration utilizes the type of cylinder construction identified as __________Not learned 114. If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase __________.Not learned 115. 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 116. Evidence of low temperature corrosion is observed on the combustion space components of a slow- speed diesel engine. What causes this corrosion and what can one do to mitigate this situation?Not learned 117. Excessive wear at part No.11, shown in the illustration would result in __________Not learned 118. Exhaust valve timing for the engine, shown in the illustration, is to be set at 106° after top dead center. To what position should the flywheel be rotated to set the exhaust valve timing on the No.11 cylinderNot learned 119. Which of the following is a benefit of the common rail fuel injection system?Not learned 120. Which of the following statements is correct concerning the connecting rod and piston assembly shown in the illustrationNot learned 121. Which of the following statements is correct concerning the operating function of the governor shown in the illustrationNot learned 122. Which of the following statements represents the function of the plunger flange labeled "A" shown in the illustrationNot learned 123. Which of the following statements would apply when checking the valve clearance of the unit shown in the illustrationNot learned 124. A four-stroke cycle auxiliary diesel engine fuel cam has shifted from its original position during maintenance. To ensure correct timing of the fuel pump, the intake and exhaust valves should be in what position when approaching top dead center for injection?Not learned 125. Which fuel chemical elemental constituents contribute to hot and cold temperature corrosion of combustion space surfaces and components of a diesel engine?Not learned 126. When a fuel injection nozzle overheats, which of the problems listed can be expected?Not learned 127. The gear drive, shown in the illustration, can have the backlash determined best by using a __________Not learned 128. The governor for an emergency diesel generator is shown in the illustration. When a large change in load results in a change in engine speed, which of the parts listed will be the FIRST governor component to react to the change in loadNot learned 129. The illustration shown describes a _______Not learned 130. In the illustration shown, moving the component labeled "E", further to the left, will result in __________Not learned 131. Increasing the oil pressure acting on the power piston of the hydraulic governor shown in the illustration will __________Not learned 132. The indicated position of the fuel injection pump plunger as shown in the illustration, will provide fuel delivery to the diesel engine in an amount approximately equal to __________Not learned 133. When inspecting the valve mechanism shown in the illustration, normal maintenance would include __________Not learned 134. When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observedNot learned 135. Item #16 of the piston shown in the illustration is a/an __________Not learned 136. The item labeled #16 in the illustration is a stack of spring washers. Their function is to __________Not learned 137. As the load is being decreased on the engine controlled by the governor shown in the illustration, the __________Not learned 138. What is a major initial ramification of receiving bunkers with a water content of 0.75% by volume?Not learned 139. What is the maximum allowable clearance permitted between the bearing, shown in the illustration and the shaft along its vertical axisNot learned 140. What is the normal bearing clearance permitted at the horizontal axis of the shaft for the bearing shown in the illustrationNot learned 141. One experiences evidence of high temperature corrosion on diesel engine combustion space components. This is exhibited by 'wire drawing' marks on exhaust valves/seats or metal reduction on cylinder heads. What causes this degradation of components?Not learned 142. The Fairbanks Morse part labeled "G", as shown in the illustration, is a __________Not learned 143. What physical property of low sulfur distillate fuel can result in operational difficulties?Not learned 144. Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to __________Not learned 145. Regularly taken indicator cards on a slow-speed diesel engine provides relative engine performance data allowing engineers to compare to previous data and manufacturer's design. What are the two most important parameters obtained from reading the indicator cards?Not learned 146. A schematic diagram of an isochronous hydraulic governor is shown in the illustration. When the load is removed the speed increases, and the __________Not learned 147. As shown in the illustration of the fuel injection pump, the function of the area designated as "L" is to __________Not learned 148. The starter control valve in the hydraulic system shown in the illustration is malfunctioning. Before removing the valve, you must first __________Not learned 149. During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, shown in the illustration, by the __________Not learned 150. After testing your medium-speed engine's exhaust valve springs you find one with a spring constant that is lower than specified by design and a length that is reduced in length from that specified by design. What is the recommended course of action?Not learned 151. 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 152. While travelling in the tropics, the condensate draining from charge air receiver drain is flowing even though you have raised the inlet temperature to the allowable limit. What effect does excessive moisture have on the engine?Not learned 153. While underway, a slow-speed diesel engine lube oil sump level slowly begins to decrease. Which of the following should be checked?Not learned 154. Which of the following statements is correct concerning the operating function of the governor shown in the illustrationNot learned 155. Crankcase explosions in propulsion diesel engines result from __________.Not learned