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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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What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）
A . White
B . Black
C . Blue
D . Clear
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The main purpose of inspection for a running diesel engine is（）
A . testing for the mechanical load and the thermal load
B . inspecting thermal and mechanical condition of the engine
C . inspecting each system and exhaust temperature
D . testing for compress pressure and explosion pressure
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Worn main bearings in a diesel engine can result in （）
A . decreased compression pressure
B . increased lube oil pressure
C . lower lube oil temperature
D . excessive leakage past the piston ring
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While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）
A . the bearing had been overheated
B . water was present in the oil
C . the lube oil was not being properly filtered
D . the maximum allowable bearing pressure had been exceeded
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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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Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）
A . increase
B . decrease
C . remain the same
D . increase on compression decrease on expansio
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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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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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On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.
A、banjo feed
B、splash feed
C、gravity feed
D、pressure feed
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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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Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
A、a circulating system; a total loss system
B、a total loss system; a circulating system
C、an opened system; a closed system
D、a closed system; an opened system
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The highest loads applied to the diesel engine crankshaft main bearings are （）
A . axial loads
B . firing loads
C . inertia loads
D . centripetal load
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Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.
A . The direction of pressure on the journal in four-stroke engine is continuously
B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D . Low-stroke engines usually consume less lube oil than four-stroke engine
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The main purpose of starting the diesel engine on air briefly is（）
A . to inspect if the cylinder has the water leakage
B . to expel out the residual water/gas/oil from the cylinder
C . to check if fuel supply is normal
D . A and B
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Main diesel engine control can be obtained by the bridge （）
A . at any time
B . only after the engine room control station is switched to ‘bridge control’
C . whenever the secondary station is switched to ‘bridge control’
D . whenever the engine side control station is switched to ‘bridge control&rsquo
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The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
A . two-stroke
B . four-stoke
C . long-stroke
D . short-stroke
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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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The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.
A . to be kept
B . logged
C . changed
D . has remained
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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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The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A . method of supplying air
B . cooling system
C . method of igniting fuel
D . valve operating mechanism
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The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）
A . Faulty thermostatic bypass valve
B . Eroded zinc pencils in the heat exchanger
C . Steam formation in the expansion tank
D . Excessive leakage from jacket water pump seal
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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
