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A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A、the use of a poor quality oil
B、the deterioration of its properties
C、the formation of deposits
D、the reduction in heat transfer ability
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Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.
A . overspeed trip
B . audible/visual alarm
C . the ships/boats general alarm
D . reserve oil storage tank
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A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）
A . early fuel injection
B . excessive bearing play within the running gear
C . overloading of the cylinder
D . all of the above
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When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）
A . The diesel oil must never be allowed to mix with the heavy fuel
B . The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C . The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D . The heating steam must be secured before the diesel oil passes through the three-way valve
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During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）
A . Flywheel inertia
B . Admission of starting air
C . The way of the vessel
D . securing of fuel to the cylinder
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On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
A . a spindle lubricator
B . an oil jet
C . internal splashing
D . drilled passages in the crankshaft
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When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）
A . starting air pressure
B . scavenge air pressure
C . over-speed trip
D . banjo oiler line
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A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）
A . reduce heat radiation to the engine room
B . aid in preventing turbocharger overheating
C . condense and drain moisture from exhaust gases
D . dampen exhaust gas pulsations in the manifold
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The main propulsion diesel continues running after you try to shut downYoushould now attempt to（）
A . stop the combustion air supply
B . engage the jacking gear
C . secure the lube oil pump
D . shut off the fuel at the day tank
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In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）
A . governor droop
B . speeder spring tension
C . fuel rack lag
D . load on the engine
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The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A . direct action of cam shaft
B . compressed air pressure
C . hydraulic “push rods”
D . direct action of the main piston moving dow
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A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
A . cylinder heads
B . exhaust valves
C . scavenging air
D . injector
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Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.
A . exhaust gas temperature system
B . exhaust load system
C . constant or pulse pressure system
D . constant volume system
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On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A . dial indicator
B . outside caliper
C . bridge gauge
D . tram rod
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Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A . fuel oil vapor at the sludge tank vent
B . unburned fuel vapors in the scavenge air receiver
C . lube oil vapors in the crank case
D . lube oil vapors in the engine room
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Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
A . Defective temperature controls in the system
B . Cavitation in the cooling water pump
C . Opened vent in the cooling system
D . Restricted water passages in the engine
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Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
A . The expansion tank should be topped off
B . The thermostatic water regulating valves should be manually opened
C . The fuel filters should be changed
D . The engine should be turned over slowly with the indicator cocks ope
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Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）
A . Electric
B . Hydraulic
C . Air
D . All of the above
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Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A . decrease the time required between cleanings
B . removes all large and small foreign objects
C . ensure a positive flow of oil at all times
D . ensure that all lube oil has been treated twice
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While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）
A . Manually trip the over-speed device
B . Interrupt the fuel flow to the engine
C . Disengage the safety interlock
D . Slide the camshaft to the neutral positio
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One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.
A . the extra weight required for the diesel reduction gearing
B . a minimum speed for the engines that limits the minimum speed of the vessel
C . the higher fuel consumption per SHP
D . the low efficiency of the system when a controllable pitch propeller is used
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Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）
A . engine support vibration isolator
B . detuner or viscous fluid damper
C . lightened crankshaft flywheel
D . spherically seated crankshaft bearing
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Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）
A . cooling water leaving each cylinder
B . fuel oil entering the injector
C . exhaust gases at various locations
D . lube oil at the bearing supplie
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If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）
A . fuel pump should be removed and all connections blanked off
B . cylinder oil feed rate should be increased slightly above that used at normal sea speed
C . cylinder oil feed rate should be reduced
D . cylinder oil feed rate should be increased to the maximum flow capable of the metering pum
