轮机英语船舶辅助机械章节练习(2018.03.13)

单项选择题
If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.
A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage
单项选择题
The emergency bilge suction or bilge injection valve is used to prevent （） of the ship.
A.proceeding
B.overloading
C.collision
D.flooding
单项选择题
The tube in a boiler should be blinded if found （）.
A.scaled
B.informed
C.leaky
D.deformed
单项选择题
After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）
A.The relief valves in the system should be readjusted
B.The filters and strainers should be checked frequently
C.All system pressure should be readjusted
D.The system should be drained and renewed with a fluid of different operating characteristics
单项选择题
The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.
A.whenever
B.however
C.wherever
D.whether
单项选择题
You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.
A.descriptions
B.discrepancies
C.different
D.deflections
单项选择题
What is the function of thermostatic expansion valve in a compression refrigeration system?（）
A.nonexistent
B.for controlling pressure
C.for controlling superheat
D.for controlling the solenoid valve
单项选择题
Moisture should be kept out of an R-12 system because it tends to cause （）.
A.icing of the automatic controls
B.embrittlement of some parts of the automatic controls
C.sludge in the lubricating oil
D.all of the above
单项选择题
A centrifuge arranged to separate two liquids is known as （）.
A.an oily water separator
B.a purifier
C.a centrifugal compressor
D.a clarifier
单项选择题
Which of the following types of hydraulic pumps would be used in a steering system?（）
A.Lobe
B.Screw
C.Radial piston
D.Volute