-
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
-
The color of the exhaust from a diesel engine should be （）
A . clear
B . hazy light brown
C . hazy light blue
D . hazy light grey
-
If a scavenge fire starts, the engine must be put to “（）” and the fuel must be taken off the cylinders affected by the fire.
A . stop engine
B . finished with engine
C . dead slow ahead
D . dead slow aster
-
During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）
A . effective cylinder scavenging and cooling
B . constant pressure from the turbochargers
C . cooler operation of the exhaust system
D . effective constant pressure for turbocharger operatio
-
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
-
If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）
A . on the power stroke
B . on the exhaust stroke
C . at the end of the power stroke
D . at the start of the intake stroke
-
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
A . Spark plug
B . Heat of compression
C . Carburetor
D . Glow ping
-
To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.
A . prevent any lubricant from reaching
B . prevent excessive lubrication from reaching the combustion space
C . Provide metal-to-metal contact to seal the cylinder against blow-by
D . assure a positive means of scraping carbon accumulation from the cylinder
-
（）, the engine must be stopped immediately.
A . Should knocking occur
B . If knocking occur
C . Should if knocking occurs
D . If occur knocking
-
The cooling water of the diesel engine should be treated, because it has（）
A . alkale scence
B . acidity
C . salinity
D . impurity
-
In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.
A . increase its quality
B . obtain complete burning
C . reduce its weight
D . all of the above
-
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
-
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
-
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
-
If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）
A . low exhaust back pressure
B . air in the fuel system
C . gasket blow-by or leakage
D . incorrect assembly of idler spring
-
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
-
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
-
The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.
A . avoid unnecessary pints inventory
B . keep torsional vibration constant
C . use existing supports and braces
D . maintain specified injection characteristic
-
Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）
A . sludge
B . water
C . micro-organism growth
D . all of the above
-
What monitoring device best indicates the load being carried by a diesel engine?（）
A . Lube oil pressure gauge
B . Jacket water temperature gauge
C . Tachometer
D . Exhaust pyrometer
-
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
-
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
-
Which of the following should always be checked prior to starting a diesel engine?（）
A . Air filters
B . Fuel oil strainers
C . Crank case oil level
D . Pyrometer reading
