单项选择题

Diesel engine fuel oil contamination often results in （）

A.governor malfunctions
B.fuel injection system malfunctions
C.high cylinder lube oil temperatures
D.low intake temperatures

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单项选择题

When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）

A.air quantity aspirated
B.fuel injection pressure
C.combustion pressure on the power stroke
D.compression on the compression stroke

单项选择题

The most common diesel engine fuel system problems are caused by （）.

A.incorrect adjustments
B.dirty fuel
C.broken fuel lines
D.excessive vibration

单项选择题

The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）

A.quantity of air it takes in and retains in the cylinders during a given time period
B.proportion of trapped air that is utilized in the combustion process
C.thermodynamic efficiency of the engine cycle
D.all of the above