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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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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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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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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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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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On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?()
A . Engine is hard to start
B . Engine misses
C . Surges at governed RPM
D . Coolant temperature is too low
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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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The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ().
A . reduce water temperature
B . reduce water turbulence
C . provide an air cushion
D . allow for an increase in water volume as the engine warms u
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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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An increase in load on a diesel engine results in () of speed of the crankshaft.
A . a reduction
B . an increase
C . an outing
D . a downward
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If the relief valve on a diesel engine cylinder lifts, the cause could be due to ()
A . liquid in the cylinder
B . low compression in the cylinder
C . high exhaust temperature
D . poor fuel penetratio
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If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to()
A . excessive ring action
B . excessive ring temperature
C . improper ring rotation
D . excessive ring face wear
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Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is()
A . a combination of constant volume and constant pressure
B . a combination of constant temperature and constant pressure
C . entirely constant pressure
D . entirely constant volume
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On a large diesel engine installation, crankshaft axial alignment is maintained by the ()
A . piston rod guides
B . engine thrust bearing
C . crosshead bearing
D . main shaft flexible coupling
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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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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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"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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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