轮机英语船舶辅助机械章节练习(2018.02.16)

单项选择题
The bilge main is arranged to drain any watertight compartment （） ballast, oil or water tanks and to discharge the contents overboard.
A.rather than
B.other than
C.in addition that
D.except for
单项选择题
A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
A.evaporator pressure decrease
B.evaporator coil over-feed
C.evaporator capacity increase
D.expansion valve diaphragm rupture
单项选择题
Refrigerant is circulated through a refrigeration system by the （）.
A.compressor
B.condenser
C.expansion valve
D.evaporator
单项选择题
The crane is usually mounted on a pedestal to offer adequate （） to the operator.
A.time
B.space
C.length
D.visibility
单项选择题
To obtain maximum efficiency, two stage air compressors are usually （）.
A.horizontally mounted
B.never fitted with intake filters
C.fitted with intercoolers
D.operated in an unloaded condition at all times
单项选择题
In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.
A.open-type
B.hermetic
C.semi-hermetic
D.all the above
单项选择题
With reference to an axial piston pump, which one of the following statements is true?（）
A.The cylindrical barrel is coupled to the motor
B.The cylindrical barrel has an odd number of bores
C.The bores end in sockets
D.The sockets fit in the swash plate
单项选择题
The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.
A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true
单项选择题
If a heavy sea strikes the rudder, the shock is transmitted through the tiller to （）.
A.the tiller arms
B.the swivel blocks
C.hunting gears
D.the rams
单项选择题
We use （） to distill fresh water from sea water.
A.engine
B.sea water pump
C.cylinder cooler
D.fresh water generator