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If the detergent type lubricating oil being used in a diesel engine is black, the oil ()
A . must be centrifuged
B . must by filtered
C . must be changed
D . is holding finely dispersed carbon in suspensio
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If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will ()
A . decrease until the engine speed increases
B . increase as the load increases
C . decrease as the load
D . increases remain unchanged
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If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST ()
A . place standby cooler in operation
B . reduce engine load
C . check thermostatic valve
D . clean sea water strainer
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A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is ()
A . one-half engine speed
B . the same as engine speed
C . twice engine speed
D . four times engine speed
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If a diesel engine fails to start,one of the likely causes is ()
A . low compression temperature
B . low ambient air pressure
C . high lube oil pump pressure
D . high fuel oil booster pump pressure
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If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase()
A . inspection covers should not be opened until the engine has cooled
B . ventilation system should be continued in operation for one hour for cooling
C . scavenge pump should be immediately secured to prevent loss of lube oil
D . explosion covers should be opened slightly to provide extra ventilatio
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If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in ()
A . a low level in the engine expansion tank
B . excessively high coolant pressure
C . improper temperatures
D . malfunctioning of the jacket water heater
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If a diesel engines exhaust temperature is abnormally high, the cause could be()
A . too light of a load
B . injection timing is too early
C . overloading of the engine
D . too low of a compression ratio
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A diesel engine will lose power if fuel injection occurs too early because the ()
A . fuel will not be properly atomized in the cylinder
B . ignition will be delayed due to low ignition temperature
C . maximum fuel expansion will occur on the compression stroke
D . fuel will ignite before top dead center
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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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If you are unable to stop a diesel engine by any other means,you should().
A . discharge a CO
extinguisher in the air inlet
B . pull off the distributor cap
C . secure the jacket water
D . secure the starting air supply valve
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If water is found in the crankcase of a diesel engine, the cause may be due to()
A . a cracked cylinder head
B . a leaky cylinder head gasket
C . a cracked cylinder liner
D . any of the above
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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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A diesel engine may be hard to start if the ()
A . air intake is restricted
B . engine is cranked too fast
C . vibration dampener is faulty
D . exhaust back pressure is 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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If a crankcase explosion occurs in a diesel engine, you should stop the engine and()
A . immediately open all crankcase relief ports
B . increase crankcase exhauster speed to draw cool air into the engine
C . allow the engine to cool naturally
D . increase crank case scavenge air to remove unburned gase
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In a four-stroke/cycle diesel engine, the camshaft rotates at ()
A . twice the crankshaft speed
B . half the crankshaft speed
C . the same speed as that of the crankshaft
D . a speed independent of that of the crankshaft
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If a diesel engine is smoking excessively under load, the cause could be ()
A . low exhaust back pressure
B . early fuel injection in one of the cylinders
C . compression pressure in one of the cylinders
D . plugged injector hole
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If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be ()
A . excessive compression pressure
B . air in the fuel lines
C . high fuel pressure
D . excessive load
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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 coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is ()
A . a broken shaft on the freshwater pump
B . an excessive accumulation of scale exchanger
C . an incorrect thermostatic element operating range
D . lube oil in the cooling water
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A diesel engine will lose power if fuel injection occurs too late in the cycle, because the()
A . fuel droplets will burn as they leave the fuel injector
B . fuel will not be properly atomized in the cylinder
C . maximum expansion of the burned fuel cannot take place in the cylinder
D . compression pressure will be too low to cause fuel ignitio
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If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the ().
A . compression pressures are below normal
B . lube oil is diluted with fuel oil
C . cranking speed is too low
D . exhaust system is partially restricted
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If a diesel engine were running at 20% overload with a smoky exhaust, you should_____.
A.stop the engine immediately to prevent damage
B.increase lube oil pressure
C.slow the engine allowing it to gradually cool
D.decrease the cooling water it temperature to the water jacket