轮机英语船舶动力装置章节练习(2018.01.20)

单项选择题
Sea water is not directly used as a coolant for engines because of its （）.
A.low specific heat
B.corrosive action
C.high expense
D.acid property
单项选择题
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
A.high steam pressure in the boiler
B.abnormally high feed water temperature
C.abnormally high boiler water temperature
D.steam demand exceeding feed pump capacity
单项选择题
Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.
A.react with insufficient speed droop
B.fail to react to small speed changes
C.have excessive sensitivity to small speed changes
D.remain in the neutral position
单项选择题
The conclusion that mechanical efficiency is always （） 100 percent is correct.
A.small than
B.more than
C.little than
D.less than
单项选择题
A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A.as much fuel as
B.less fuel than
C.less fuel as
D.more fuel than
单项选择题
Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubrication increased （） the risk of seizure.
A.to protect
B.to guard
C.to maximize
D.to minimize
单项选择题
The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a （）.
A.water liner
B.wet liner
C.dry liner
D.drown liner
单项选择题
Each cylinder liner on the marine medium speed engines （）.
A.is usually cooled by sea water
B.can be replaced when worn out
C.is in direct contact with the water in the bore of the cylinder
D.can t expand when heated
单项选择题
If the temperature drops low enough, oil will not flow, （） just tell us the temperature.
A.Hash point
B.Viscosity
C.Pour point
D.Cetane number
单项选择题
What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）
A.375 RPM
B.500 RPM
C.750 RPM
D.1500 RPM