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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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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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The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the ()
A . camshaft
B . crankshaft
C . governor
D . flywheel
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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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On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine ()
A . speed will drop drastically with any increase in load
B . will stop due to zero fuel supply
C . will stall upon application of load
D . speed will remain fairly constant despite load change
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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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The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by()
A . governor flyweight action on a pilot valve which controls fuel injection
B . governor flyweight motion acting on fuel controls through suitable linkage
C . positioning a butterfly valve in the fuel delivery system positioning
D . a servomotor piston attached to the fuel control
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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 main purpose of changing main engine to electronic controlled is not to()
A . control fuel injection time more precisely
B . control fuel injection rate more precisely
C . meet the environmental requirements
D . meet high engine speed requirement
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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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The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()
A . regulating the level of corrosion inhibitor in the primary cooling system
B . the level of the freshwater expansion tank
C . varying the engine load to meet temperature requirements
D . the operation of the thermostatic valve
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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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With UMS, when the engine room is unwatched () will control the main engine.
A . the bridge officer on watch
B . the chief engineer
C . the duty engineer
D . the duty motorma
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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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The timing of diesel engine air starting valves is controlled by()
A . the air start valve timing gears and rods
B . a cylinder check valve
C . individual cams and valve gear
D . an air manifold poppet valve
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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 amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by()
A . the firing pressure in the cylinder
B . a metering helix inside the pump
C . varying the physical length of the plunger stroke
D . varying the clearance between the injector cam and the injector rocker arm
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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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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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Diesel engine air start valve timing is controlled by()
A . engine operating speed
B . an air manifold
C . a hydraulic distributor
D . individual cams and valve gear
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On most diesel engines, the governor controls the output speed by ().
A . controlling the amount of fuel injected into the cylinders
B . varying the speed of the turbocharger
C . adjusting the compression ratio
D . changing the timing of the fuel injection camshaft
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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 direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by______.
A.governor flyweight action on a pilot valve which controls fuel injection
B.governor flyweight motion acting on fuel controls through suitable linkage
C.positioning a butterfly valve in the fuel delivery system positioning
D.a servomotor piston attached to the fuel controls