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单选题
In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）
A
Constant tension mooring winch system
B
Hatch cover system
C
Watertight door system
D
Internal combustion engine hydraulic starter system
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When the helm is turned on the navigation bridge，which of the listed actions will be the FIRST response in the steering room on a ship equipped with an electro-hydraulic steering gear ________．A.The pumps go to full strokeB.The six-way valve aligns itself with the running pumpC.Both port and starboard cables are energizedD.The synchronous receiver turns，duplicating the helm motion
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单选题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）A
Pressure-reducing valveB
Unloading valveC
Counterbalance valveD
Pressure-relief valve
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单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）A
The six-way valve opensB
The steering service pump motor is stoppedC
The follow-up gear takes the pump off strokeD
The cylinder relief valves bypass oil to the suction side the pump
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单选题Pressure in an operating hydraulic system is developed （）.A
only by the pump as its primary functionB
by resistance to the fluid flow through the systemC
by the thermal input to the systems fluidD
solely by the charge applied by the accumulators
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单选题Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）A
Spring-centered valveB
Unloading valveC
Three-position valveD
Two-position valve
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单选题Which of the following hydraulic systems is not one of the three sub-division of the Hydraulic drive system?（）A
Constant pressure systemB
Variable pressure systemC
Variable displacement systemD
Constant volume system
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单选题A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）A
act as a shock absorberB
maintain the stored oil under pressureC
act as a base or foundation for the power unitD
eliminate pressure surges in the system
考题
单选题（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.A
MotorsB
Check valvesC
Safety valvesD
Reducing valve
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单选题Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）A
Constant volumeB
Constant pressureC
Pulse pressureD
Radial flow
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单选题Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）A
hoisting system onlyB
hoisting system and luffing systemC
hoisting system and slew and slewing systemD
slewing system only
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单选题Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）A
LubricationB
CoolingC
FuelD
Electric ignition
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单选题Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）A
The hydraulic pumpsB
ValvesC
Hydraulic cylindersD
Hydraulic motors
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单选题If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）A
FuelB
LubricatingC
CoolingD
Ignition
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单选题External and internal leakage in hydraulic systems may be caused by （）.A
unusual vibrationB
excessive worn partsC
abnormal pressureD
any of the above
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单选题Which of the listed statements is correct concerning refrigeration systems?（）A
Dehydrators must be used continuously in a refrigeration systemB
A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hoursC
A thermostatic expansion valve is used to control refrigerated space temperatureD
The liquid receiver functions to collect and remove non- condensable gases
考题
单选题Compensated flow control or constant flow valves are used in hydraulic systems to（）A
compensate for major leaks in the systemB
maintain the original fluid viscosityC
allow for changes in pressure and temperature within the systemD
assure constant fluid temperature
考题
单选题Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）A
The follow-up gearB
The rudder angle indicatorC
The synchronous electric transmitterD
A rudder angle limit switch
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单选题Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）A
Common-rail injectionB
Air injectionC
Jerk pump injectionD
Distribution injection
考题
单选题Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）A
ElectricB
HydraulicC
AirD
All of the above
考题
单选题In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.A
better control capabilitiesB
less maintenance and repairC
fewer personnel needed during jackingD
less preload needed
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单选题On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?（）A
Rudder angle indicatorB
Follow-up gearC
Electric transmitterD
Rudder angle limit switch
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