轮机英语船舶动力装置单项选择题每日一练(2019.01.26)

单项选择题
In a simple mechanical governor, the （）.
A.centrifugal force rotates the ball-head
B.flyweight centrifugal force is balanced by spring force
C.flyweight centrifugal force is balanced by hydraulic pressure
D.speeder spring alone actuates the fuel control rod
单项选择题
In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
A.metal particles loosened by wear
B.air when no air cleaners are used
C.condensation of water vapors
D.breakdown of the lubricating oil by dilution
单项选择题
（） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.
A.The driven gear
B.The drive
C.The grease
D.The lubricating oil
单项选择题
When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.
A.stand-by engine
B.full ahead
C.finished with engine
D.full away
单项选择题
The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.
A.wheel
B.crankshaft
C.running gear
D.cam