轮机英语船舶动力装置章节练习(2018.01.27)

单项选择题
（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
A.Too larger
B.Too smaller
C.Excess
D.Excessive
单项选择题
Failure of fuel injection is usually due to trouble in the （）.
A.exhaust valves
B.mechanical lubricators
C.cooling water pumps
D.fuel injection pumps
单项选择题
The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.
A.fuel treatment
B.fuel combustion
C.fuel injection
D.fuel separating
单项选择题
The figure that the volume of air at BDC is divided by the volume of air at TDC is termed as（）.
A.ignition ratio
B.power ratio
C.compression ratio
D.injection ratio
单项选择题
Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.
A.fuel oil
B.diesel oil
C.compressed air
D.jacket water
单项选择题
Smaller engines can be made more rigid than large ones and may not have （）.
A.connecting rods
B.crankshaft
C.crankcase
D.through bolts
单项选择题
Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A.operated manually once an hour
B.operated until the engine has started
C.placed into operation only at maximum load
D.adjustable to meet lubrication requirements
单项选择题
Low compression of diesel engine may result from （）
A.a worn cylinder
B.broken piston rings
C.any of A and B
D.none of the above
单项选择题
You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.
A.the temperature
B.the rust
C.the pressure
D.the humidity
单项选择题
To prevent the build up of high stresses engine must not be run continuously （）.
A.faster than dead slow speed
B.slower than dead slow speed
C.with the output of MCR
D.at critical speeds