问题：
[单选] A crankshaft whose center of gravity coincides with its center line is said to be （）.
dynamically balanced。statically balanced。counter balanced。resonantly balanced。
问题：
[单选] The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.
metering。timing。rate of injection。rate of distributio。
问题：
[单选] In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
metal particles loosened by wear。air when no air cleaners are used。condensation of water vapors。breakdown of the lubricating oil by dilutio。
问题：
[单选] The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.
an isochronous governor。elastic engine mounts。a vibration damper。a cast iron bed plate with good flexible qualitie。
问题：
[单选] In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
steam stop valve。dry pipe。feedwater system。generating tube。
问题：
[单选] A dirty diesel engine oil filter element can best be detected by （）.
visual inspection of the elements。the pressure drop across the filter。high lube oil sump temperature。decrease in oil viscosity from the filter。
问题：
[单选] Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially （）.
increase。decrease。fluctuate。remain constant。
问题：
[单选] The small end of the connecting rod is attached to the piston with a （）.
crankpin。sliding wedge。wrist pin。torque bashing。
问题：
[单选] Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
open the bypass line。cut in the lube oil cooler。pressurize the lube oil system。top off the expansion tank。
问题：
[单选] In a diesel engine lube oil system, which of the following parts should be lubricated first?（）
Camshaft beatings。Main bearings。Piston crowns。Cylinder wall。
