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Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.
A . compression
B . maximum
C . rated
D . oil
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Diesel engine fuel oil contamination often results in （）
A . governor malfunctions
B . fuel injection system malfunctions
C . high cylinder lube oil temperatures
D . low intake temperature
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The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
A . corrosion and grooving of exhaust valves
B . corrosion and gumming of the fuel injection pump
C . salt deposits in the exhaust manifold
D . slag deposits in the fuel injection equipment
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Dirt in the fuel oil system of a diesel engine can cause （）.
A . clogged filters
B . poor combustion
C . overloading of the diesel
D . shock of fuel line
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Proper atomization of fuel in diesel engine combustion chambers will （）.
A . affect the injection pressure
B . improve combustion
C . reduce compression pressure
D . decrease power output
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Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）
A . supercharging
B . scavenging
C . turbulence
D . swept volume charging
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In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）
A . injection lag
B . ignition delay
C . compression
D . turbulence lag
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Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）
A . grinding the spare plunger to the barrel
B . replacing the plunger and the barrel
C . highly polishing both the plunger and barrel
D . replacing plunger only
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Significant retardation of a diesel engine fuel injection timing will result in （）
A . smoother engine operation
B . advanced fuel ignition
C . increased fuel economy
D . reduced engine power
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In a diesel engine, when the fuel is injected into the cylinder,（）
A . the piston is just coming upward from the bottom dead center
B . the piston has moved about one-fifth of the way up
C . the piston has moved most of the way up and almost reached the TDC
D . the piston has just past the TDC
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When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）
A . maintain higher than normal jacket water temperature
B . change the lube oil more frequently than normal
C . maintain a higher air-box temperature than normal
D . maintain a higher air-box pressure than normal
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Burning fuel with a high sulfur content in a diesel engine will （）
A . increase thermal efficiency
B . cause clogging of the fuel system
C . increase the ability of the engine to start in cold weather
D . produce corrosion in the cylinder and exhaust system at low load
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Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）
A . electronic ignition system
B . compression of air by the piston
C . friction in the fuel injector
D . fuel oil bearing system
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Fuel is ignited in a diesel engine cylinder by （）
A . a spark plug
B . injectors
C . the heat of compression
D . increasing jacket water temperature
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Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?（）
A . Viscosity
B . Sulfur content
C . Pour point
D . Cetane number
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A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.
A . air turbulence
B . fuel penetration
C . fuel spray angle
D . fuel injection rate
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The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）
A . clogged fuel injection pumps
B . increased cylinder liner wear
C . intake valve stem corrosion
D . varnish deposit on pisto
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Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）
A . increased horsepower
B . reduced efficiency
C . increased heat loss
D . lower cylinder pressure
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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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A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）
A . feel the high pressure fuel line
B . check the cylinder exhausts for white smoke frequently
C . check the cylinder exhaust temperature
D . isolate each cylinder and inspect the injector
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The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.
A . air bottle
B . air compressor
C . crank case
D . combustion chamber
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Late fuel injection in a diesel engine is indicated by low firing pressure with（）
A . high exhaust temperature
B . low exhaust temperature
C . fuel knock in each cylinder
D . mechanical knock in each cylinder
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A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）
A . engine overload
B . leaky valves
C . stuck or broken piston rings
D . low air injection pressure
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Burning fuel with a high sulfur content in a diesel engine will ＿.
A.increase thermal efficiency
B.cause clogging of the fuel system
C.increase the ability of the engine to start in cold weather
D.produce corrosion in the cylinder and exhaust system at low loads
