單項(xiàng)選擇題Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in ().

A.decreased fuel consumption per brake horsepower
B.more complete cylinder scavenging
C.extended valve life
D.carbon formation on combustion chamber surfaces


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題A dirty fuel oil filter element can be detected by ()

A.Visual inspection of the element
B.the pressure drop cross the filter
C.high fuel oil tank temperature
D.increase flow rate from the filter

2.單項(xiàng)選擇題The major cause of fuel pump and injection system problems is ()

A.improper adjustments
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration

3.單項(xiàng)選擇題A diesel engine should not be operated at low loads for long periods of time because()

A.heavy carbon deposits will buildup on the valves and in the exhaust
B.fuel dilution is increased at low load
C.exhaust valves may be damaged
D.all of the above

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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