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单选题
If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will （）
A
open late and close early
B
open late and close late
C
fail to open when the engine is cold
D
fail to open at normal operating temperature
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point of openingB
speed of openingC
lift from its seatD
all of the above
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the engine is overloadedB
the engine is coldC
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liquid in the cylinderB
low compression in the cylinderC
high exhaust temperatureD
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单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）A
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excessively high coolant pressureC
improper temperaturesD
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excessively late injection timing for each cylinderB
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incorrectly adjusted fuel injectorD
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单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）A
Quantity of fuel injected tends to be decreasedB
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考题
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）A
Holding the valve open for a long periodB
Increasing the starting air pressure usedC
Opening the stating air valve quicklyD
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考题
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late ignitionB
water in the fuelC
high compression temperatureD
starting valve stuck open
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单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
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考题
单选题Worn diesel engine intake valve guides can result in （）A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
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engine operating speedB
an air manifoldC
a hydraulic distributorD
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考题
单选题Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）A
later and closing earlierB
later and closing laterC
earlier and closing earlierD
earlier and closing later
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单选题Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）A
increase back pressure during the exhaust processB
facilitate periodic replacement of the valvesC
reduce the pumping loss associated with scavengingD
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考题
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during the valve overlap periodB
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at a pressure below atmosphericD
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fire improperlyC
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考题
单选题Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）A
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The greater the atomization, the less the penetrationC
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考题
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）A
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worn main bearingC
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考题
单选题A Kort nozzle is a(n)（）.A
hollow tube surrounding the propeller used to improve thrustB
nozzle attached to a firefighting hoseC
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考题
单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.A
temperature of the exhaust gasesB
energy supplied to the turbochargerC
air pressure to the intake manifoldD
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考题
单选题Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）A
during the valve overlap periodB
with only the exhaust valve openC
at a pressure below atmosphericD
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increased pumping lossesC
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reduced blow-by
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misfiringB
pre-ignitionC
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单选题The timing of diesel engine air starting valves is controlled by（）A
the air start valve timing gears and rodsB
a cylinder check valveC
individual cams and valve gearD
an air manifold poppet valve
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