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单选题
When monitoring diesel engine performance, the most useful instrument to use is the （）
A
dwell-tachometer
B
exhaust gas pyrometer
C
fuel flow rate mete
D
exhaust gas analyzer
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the piston is just coming upward from the bottom dead centerB
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单选题A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.A
air turbulenceB
fuel penetrationC
fuel spray angleD
fuel injection rate
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Electric startingC
IgnitionD
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Sulfur contentC
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dirty fuelC
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单选题For a diesel engine, when the piston is at the （）, the clearance volume is the largest.A
TDCB
DTCC
BDCD
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Lube oil pressure gaugeB
Jacket water temperature gaugeC
TachometerD
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a modem diesel engine；exhaust gasesC
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