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The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.
A . fuel injectors
B . exhaust valves
C . intake valves
D . all of the above
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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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Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
A . burned exhaust valves
B . excessive spring compression
C . spring surge
D . worn valve seat
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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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Leaking oil seals on a diesel engine turbocharger can cause（）
A . the engine to run after the fuel has been secured
B . the engine to over-speed
C . a fire
D . all of the above
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If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）
A . excessively late injection timing for each cylinder
B . incorrectly adjusted intake valve timing
C . incorrectly adjusted fuel injector
D . incorrectly adjusted intake valve clearance
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On a diesel engine, fuel is delivered into the combustion space by （）.
A . a cooling system
B . a lubrication oil system
C . an electric system
D . an injection system
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Lubricating oil should be changed on a heavy duty diesel engine when（）.
A . it gets dark in color
B . a sample rubbed between fingers feels thin
C . it has been in use for a specified interval
D . it no longer supports combustio
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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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When installing rings on a diesel engine piston, you should check the ring（）
A . diametrical tension
B . gap clearance
C . radial thickness
D . face thickne
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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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Clogged or partially obstructed exhaust ports on a diesel engine can cause（）
A . over-speeding of the engine
B . failure of the engine to shut down
C . no effect of engine mounting bolts
D . high exhaust temperature
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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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A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）
A . combustion gas blow-by
B . excessive lubrication
C . properly functioning rings
D . insufficient cylinder cooling
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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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Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
A . increase back pressure during the exhaust process
B . facilitate periodic replacement of the valves
C . reduce the pumping loss associated with scavenging
D . reduce tension on valve spring
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What is the effect of heated intake air on a diesel engine? （）
A . Increases efficiency
B . Increases engine horsepower
C . Increases engine life
D . Reduces engine horsepower
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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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A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）
A . line up the engine fore restarting with light diesel oil
B . reposition the fuel injection cam
C . change the intake and exhaust valve cam positions
D . place the starting cam in the intermediate positio
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On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）
A . Overspeed trip
B . Air inlet shut-off valve
C . Water injector
D . Fuel cutoff valve
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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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"Scavenging" on a diesel engine means （）.
A . injecting fuel oil into a cylinder
B . removing exhaust gases from the cylinder
C . forcing air into the cylinders under pressure after the exhaust valve has dosed
D . a combination of all the above
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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 marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.
A.principle
B.principal
C.cause
D.case
