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单选题
Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.
A
the formation of sulfuric acid
B
a decrease in lube oil viscosity
C
a decrease in cooling water pH
D
a thermostat failure
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elastic engine mountsC
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a cast iron bed plate with good flexible qualities
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sub-cooling internal components
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decreased fuel consumption per brake horsepowerB
more complete cylinder scavengingC
extended valve lifeD
carbon formation on combustion chamber surfaces
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Raw water pressureC
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考题
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scavengingB
forced draftC
turbo-chargingD
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考题
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考题
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increased carbon buildupB
burning of intake valvesC
excessive firing pressuresD
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考题
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open late and close earlyB
open late and close lateC
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考题
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cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
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考题
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Light blue hazeB
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Light gray hazeD
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考题
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exhaustB
air box pressureC
brake main effective pressureD
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worn main bearingC
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weak rocker arm springs
考题
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Spark plugB
Heat of compressionC
CarburetorD
Glow plug
考题
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below 300B
above 1200C
between 300 to 1200D
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考题
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increasing cooling water flowB
increasing lube oil flowC
dilution by fuel oilD
adding SAE 70 oil
考题
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bad combustionC
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考题
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reduce the engine loadB
increase the cooling water flowC
increase the lube oil pressureD
adjust the fuel rack
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