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单选题
The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）
A
expansion of the combustion gases
B
exhaust and intake valves just closing
C
maximum compression is just being attained
D
fuel injection occurring at that point and combustion begins
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单选题What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）A
Rapid increase in temperature with constant pressureB
Rapid increase in pressure with constant temperatureC
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check the cylinder exhaust temperature frequently
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单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.A
reduce engine horsepower outputB
aid in silencing the exhaust noiseC
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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
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单选题The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）A
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单选题Which statement about diesel engine combustion is true?（）A
Combustion does not begin until the piston starts down on the power strokeB
Maximum combustion pressure is reached before TDCC
Turbulence in the cylinder causes a delay in ignitionD
Maximum cylinder firing pressure is not developed until the piston passes TDC
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high lube oil temperatureB
low lube oil temperatureC
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