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单选题
A restricted air intake to a diesel engine may result in the engine （）.
A
failing to reach rated speed
B
knocking under maximum load
C
hunting or surging under light load
D
overspeeding and running away
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单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）A
natural aspirationB
masked intake valvesC
air cellsD
scavenging air
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单选题A diesel engine cylinder head can crack as a result of （）A
a leaking seal ringB
heat transfer from exhaust valvesC
restricted cooling passagesD
overheated intake valves
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单选题Intake air flow from a diesel engine turbocharger is directly proportional to engine（）A
exhaust gas pressureB
exhaust gas temperatureC
speedD
load
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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
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单选题Poor combustion in a diesel engine can be caused by （）.A
high compression pressureB
low intake air temperatureC
low exhaust pressureD
high scavenge air temperature
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单选题A diesel engine emits blue exhaust smoke as a result of（）A
cold intake airB
excessive compression pressureC
excessive cylinder lubricationD
a light load
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单选题Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）A
increase in starting air pressureB
increase in lube oil viscosityC
compression expansion deviceD
jacket water heater
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单选题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 cylinderB
incorrectly adjusted intake valve timingC
incorrectly adjusted fuel injectorD
incorrectly adjusted intake valve clearance
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单选题Worn diesel engine intake valve guides can result in （）A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
lower than normal fuel consumption
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单选题Cooling the intake air supplied to a diesel engine will （）.A
reduce mean effective pressureB
decrease average compression pressureC
decrease air charge densityD
increase power output
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单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
low scavenge air temperature
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单选题A diesel engine may be hard to start if the （）A
air intake is restrictedB
engine is cranked too fastC
vibration dampener is faultyD
exhaust back pressure is low
考题
单选题What is the effect of heated intake air on a diesel engine? （）A
Increases efficiencyB
Increases engine horsepowerC
Increases engine lifeD
Reduces engine horsepower
考题
单选题Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）A
Faulty turbocharger turbine diffuser ringB
Faulty turbocharger compressor ringC
Insufficient cooling water flowD
Clogged air intake filters
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单选题As for a diesel engine, lack of combustion air may be due to （）.A
fouling turbineB
fuel pump faultsC
lubrication failureD
excessive cooling
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单选题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 oilB
reposition the fuel injection camC
change the intake and exhaust valve cam positionsD
place the starting cam in the intermediate position
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单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
has a lower effective compression ratioC
operates with scavenge air under a positive pressureD
operates without energy absorbing intake and exhaust strokes
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单选题Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A
Clogged air intake faltersB
Piston blow-byC
A defective after-coolerD
Faulty exhaust valves
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单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）A
Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
Clogged air intake filters
考题
单选题The process of scavenging a two-stroke/cycle diesel engine serves to（）A
improve fuel flow volumeB
cool the exhaust valvesC
reduce the intake air charge densityD
increase the temperature of exhaust gases
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单选题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 strokeB
on the exhaust strokeC
at the end of the power strokeD
at the start of the intake stroke
考题
单选题When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）A
an obstruction in an cylinderB
water accumulation in some engine cylindersC
low starting air pressureD
low scavenge air pressure
考题
单选题In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.A
compression ratioB
valve sizeC
fuel pressureD
cylinder clearance volume
考题
单选题On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）A
Engine is hard to startB
Engine missesC
Surges at governed RPMD
Coolant temperature is too low
考题
单选题Higher than normal temperature air passing through the intake of a diesel engine will result in（）A
greater overall efficiencyB
greater fuel economyC
lower horsepowerD
lower compression ratio
考题
单选题Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in （）A
an air bound fuel systemB
damage to cylinder heads and pistonsC
excessive fuel injectionD
excessive air valve lift
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