A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）

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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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• 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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• Cooling the intake air supplied to a diesel engine will （）.

  A . reduce mean effective pressure B . decrease average compression pressure C . decrease air charge density D . increase power output

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• A leaking diesel engine fuel injector will cause（）

  A . prolonged maintenance intervals B . improved atomization C . greater fuel economy D . incomplete combustio

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• Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.

  A . overspeed trip B . audible/visual alarm C . the ships/boats general alarm D . reserve oil storage tank

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• Excessive piston ring wear in a diesel engine will cause（）

  A . high lube oil viscosity B . increased lube oil consumption C . low lube oil temperatures D . high firing pressure

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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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• Higher than normal temperature air passing through the intake of a diesel engine will result in（）

  A . greater overall efficiency B . greater fuel economy C . lower horsepower D . lower compression ratio

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• A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）

  A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

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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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• What condition will result in the automatic shutdown of a diesel engine? （）

  A . High jacket water pressure B . High lube oil pressure C . Low lube oil pressure D . Excessive turbo charger speed

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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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• When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）

  A . starting air pressure B . scavenge air pressure C . over-speed trip D . banjo oiler line

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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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• 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 turbocharged diesel engine will have an intake manifold pressure（）

  A . constantly decreasing as engine load increase B . constantly increasing as the amount of supercharging increases C . approximately equal to exhaust manifold pressure at all times D . approximately equal to atmospheric pressure at all time

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• A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）

  A . slightly less than atmospheric pressure B . approximately equal to exhaust manifold pressure at all times C . that is widely fluctuating constantly D . decreasing as engine load increase

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• Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.

  A . decreased fuel consumption per brake horsepower B . more complete cylinder scavenging C . extended valve life D . carbon formation on combustion chamber surface

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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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• When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）

  A . air quantity aspirated B . fuel injection pressure C . combustion pressure on the power stroke D . compression on the compression stroke

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• With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the（）

  A . ignition quality of the fuel B . high heating value of the fuel C . amount of carbon residue after combustion D . internal flow resistance in the injector

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• Defective air cooler in a diesel engine will lead to （）.

  A . smoky exhaust B . starting failure C . overload D . over speed

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• After-cooling of a turbocharged diesel engine will result in （）

  A . higher torque but lower brake horsepower B . lower torque but higher brake horsepower C . higher torque and lower brake horsepower D . lower torque and higher brake horsepower

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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

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