In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）

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• 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

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• White smoke exhausting from a diesel engine can be caused by （）

  A . low combustion temperature B . a leaking fuel nozzle check valve C . late fuel injection D . plugged oil-scraper ring hole

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• High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

  A . decreased piston to cylinder head clearance B . increased exhaust system back pressure C . early fuel injection timing D . low scavenge air temperature

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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 smoking exhaust from an operating diesel engine could be caused by （）

  A . low sulfur content in the fuel B . a loose injector inlet connection C . late fuel injection D . high injection pressure

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• A dark exhaust from a running diesel engine can be caused by （）

  A . late ignition B . water in the fuel C . high compression temperature D . starting valve stuck ope

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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• The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）

  A . pumping action of the piston B . pressure of the fuel charge C . vacuum developed in the manifold D . pressure of the fresh air charge

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• A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

  A . excessive cylinder lubrication B . a lugging engine C . a leaking cylinder liner D . overloading of one cylinder

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• One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）

  A . reduce lube oil temperature B . raise exhaust temperature reduce C . excessive heating of engine room D . reduce load on cooling water pum

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）

  A . increasing the linear velocity of the exhaust gases B . changing directions of exhaust gas flow C . decreasing the temperature of the exhaust gases D . accelerating the exhaust gas through a reduced size orifice

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• How would the exhaust of a properly operating diesel engine appear?（）.

  A . Light blue haze B . Light brown haze C . Light gray haze D . Perfectly clear

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• Black smoke exhausting from a diesel engine indicates（）

  A . proper fuel injection B . water in the fuel C . incomplete combustion D . burning of lube oil

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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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• A diesel engine emits blue exhaust smoke as a result of（）

  A . cold intake air B . excessive compression pressure C . excessive cylinder lubrication D . a light load

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• A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）

  A . reduce load B . check your exhaust C . adjust cooling water temperature D . increase lube oil flow

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• In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure

  A . Ⅰonly B . Ⅱonly C . bothⅠand Ⅱ D . neitherⅠnor Ⅱ

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• Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）

  A . increase back pressure during the exhaust process B . facilitate periodic replacement of the valves C . reduce the pumping loss associated with scavenging D . reduce tension on valve spring

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• One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）

  A . increase scavenge air pressure B . reduce fuel booster pump pressure C . adjust the fuel rack D . retard fuel injector timing

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• Diesel engine exhaust noise can be reduced in an exhaust muffler by （）

  A . changing the direction of exhaust gas flow B . increasing the exhaust gas velocity C . changing the exhaust gas weight D . increasing the exhaust gas static pressure

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• In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）

  A . exhaust manifold B . valve bridge C . pressure of the fresh air charge D . valve adjusting gear

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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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• In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to_______.

  A.produce a scavenging effect in the combustion space B.equalize cylinder and exhaust manifold pressures C.alleviate the difference in valve size between the intake and exhaust D.flush out condensate that collects after each compression stroke

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