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单选题
Black smoke exhausting from an operating diesel engine can be caused by （）
A
fuel dribbling from leaking fuel injectors
B
burning fuel with a high carbon content
C
burning fuel with a high vanadium content
D
burning fuel with a lower sulphur content
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考题
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 overloadB.leaky valvesC.stuck or broken piston ringsD.low air injection pressure
考题
Engine operating conditions may be indicated by the color of the exhaust smoke Black smoke could indicate .A.an insufficient speed droop settingB.an overloaded engineC.clogged drain holes in the oil control ringsD.complete combustion
考题
In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.A.low firing pressureB.low exhaust temperatureC.mechanical knock in each cylinderD.fuel knock in each cylinder
考题
Sudden unloading of a diesel engine can cause ______．A.Decreased fuel efficiencyB.Increased exhaust temperatureC.Black smokeD.Overspeed trip
考题
单选题Black smoke exhausting from a diesel engine indicates（）A
proper fuel injectionB
water in the fuelC
incomplete combustionD
burning of lube oil
考题
单选题White smoke exhausting from a diesel engine can be caused by （）A
low combustion temperatureB
a leaking fuel nozzle check valveC
late fuel injectionD
plugged oil-scraper ring hole
考题
单选题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 overloadB
leaky valvesC
stuck or broken piston ringsD
low air injection pressure
考题
单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）A
water in the fuelB
insufficient fuel for combustionC
clogged air intake passagesD
burning lubricating oil
考题
单选题The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.A
an isochronous governorB
elastic engine mountsC
a vibration damperD
a cast iron bed plate with good flexible qualities
考题
单选题White smoke exhausting from an operating diesel engine may indicate （）.A
a cracked linerB
burning lube oilC
an overloaded engineD
insufficient combustion air
考题
单选题White smoke exhausting from a diesel engine can be caused by a （）A
high combustion temperatureB
high compression pressureC
cracked cylinder linerD
fuel with a high vanadium content
考题
单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）A
the engine is overloadedB
the engine is coldC
there is too much lube oil in the cylindersD
the turbocharger is fouled
考题
单选题Black smoke coming from a boiler can be caused by （）.A
low water levelB
high water levelC
excessively high fuel pressureD
low oil temperature
考题
单选题Due to excessive water in the fuel, a diesel engine fails to startBefore the engine can be started, the water must be removed from the （）.A
fuel pumpsB
cylindersC
fuel strainersD
all of above
考题
单选题Air in the fuel lines of a diesel engine can cause （）A
ignition failureB
oxygen corrosion of the fuel linesC
the pistons to seizeD
blue smoke
考题
单选题White smoke exhausting from a diesel engine can result from （）A
high exhaust temperatureB
high lube oil temperatureC
low turbo-charger speedD
low cooling water temperature
考题
单选题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 lineB
check the cylinder exhausts for white smoke frequentlyC
check the cylinder exhaust temperatureD
isolate each cylinder and inspect the injector
考题
单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）A
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
Decreased compression ratioD
Increased compression ratio
考题
单选题Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）A
an insufficient speed droop settingB
an overloaded engineC
clogged drain holes in the oil control ringsD
complete combustion
考题
单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.A
engine overloadB
low combustion temperatureC
plugged fuel nozzle holesD
excessive compression pressure
考题
单选题In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）A
low firing pressureB
low exhaust temperatureC
mechanical knock in each cylinderD
fuel knock in each cylinder
考题
单选题Water in the fuel can prevent the engine from starting, prevent it from developing full power, or （）A
run at an irregular speedB
create high lube oil temperatureC
cause the engine to over-speedD
cause blue smoke in the exhaust
考题
单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）A
cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
using a timing light
考题
单选题If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）A
a cracked cylinder linerB
clogged intake portsC
broken piston ringsD
a faulty head gasket
考题
单选题Lubricating oil viscosity in an operating diesel engine can be reduced by（）A
increasing cooling water flowB
increasing lube oil flowC
dilution by fuel oilD
adding SAE 70 oil
考题
单选题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）A
check the air filter for obstructionB
check for an exhaust leakC
check the exhaust temperatureD
secure the engine
考题
单选题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 loadB
check your exhaustC
adjust cooling water temperatureD
increase lube oil flow
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