轮机英语船舶电气与船舶安全章节练习(2019.03.27)

单项选择题
The ignition quality of a fuel oil is an important operational consideration because it（）
A.indicates the amount of abrasive material in the fuel
B.affects the starting ability of a cold engine
C.determines the amount of fuel penetration engine
D.affects the compression ratio of an operating engine
单项选择题
Trunk-type diesel engine pistons are most effectively cooled by heat（）
A.conducted through the engine block
B.conducted to water cooled cylinder walls
C.conducted through the piston crown
D.loss to escaping exhaust gases
单项选择题
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
A.the master and the chief engineer are unable to communicate effectively
B.serious corrosion on the hull
C.damaged sanitary pump
D.one page missing in the oil record book
单项选择题
When anaerobic bacteria convert the sewage to an inert sludge,（）
A.no oxygen is needed
B.oxygen is necessary
C.oxygen is given off
D.no gas is produced
单项选择题
If the compression ratio is increased on any diesel engine, （）
A.the expansion ratio will decrease
B.combustion will be slowed down
C.thermal efficiency will decrease
D.thermal efficiency will increase
单项选择题
An advantage of DC motors over AC motors is that they （）
A.are less expensive
B.require less maintenance
C.can be started across the line
D.offer a more effective means of controlling speed
单项选择题
Early models of the flash-type evaporators used a separate shell-and-tube heat exchanger as the air ejector condenser.More recent models use a combined air ejector condenser with the（）
A.distilling condenser
B.salt water feed heater
C.distillate cooler
D.flash chamber
单项选择题
A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）
A.reduce load
B.check your exhaust
C.adjust cooling water temperature
D.increase lube oil flow
单项选择题
Top piston rings are plasma coatedIt gives added safety for the of new lines（）
A.running-in
B.running-out
C.running on
D.running down
单项选择题
（） handle and instruments are on the front.
A.open
B.open front type
C.live front type
D.None of the above