High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

单项选择题Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.

A.high temperature and a high viscosity
B.high temperature and a low viscosity
C.low temperature and a high viscosity
D.low temperature and a low viscosity

单项选择题Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.

A.vanadium
B.carbon
C.copper
D.ash

单项选择题Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）

A.The amount of fuel injected will be increased
B.The start of injection will be retarded
C.The nozzle will permit fuel to dribble
D.The spray pattern will be distorted

单项选择题The required amount in the change of speed necessary before a governor will make a corrective movement is known as （）.

A.speed droop
B.sensitivity
C.stability
D.promptness

单项选择题Turbulence in a diesel engine cylinder is of major importance in providing （）.

A.proper fuel metering
B.complete fuel/air mixing
C.minimal fuel penetration
D.proper fuel timing