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单选题
Most hydraulic steering gears are fitted with relief valves which（）
A
function when the rudder is amidships
B
relieve excess whip pressure from the hydraulic oil system
C
protect the piping assembly from external rudder shock
D
relieve excessive telemotor pressure
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考题
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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
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单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
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考题
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
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单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.A
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lock the oil lines under some conditionsC
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单选题After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）A
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考题
单选题Air trapped in the hydraulic fluid of a steering system may be indicated by（）A
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考题
单选题Overload protection on hydraulic system is provided by the use of （）.A
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考题
单选题According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.A
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单选题Hydraulic cranes must be properly warmed-up before being operated because （）.A
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warm-up allows the relief valves to be properly testedC
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hydraulic fluid must be at the proper viscosity
考题
单选题Steering gears can be arranged with hydraulic control equipment known as a （）, or with electrical control equipment.A
telemeterB
telemanometerC
telemotorD
telemometer
考题
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）A
When the helm is at any angle other than amidshipsB
When the six-way valve is openedC
When the ram relief valves liftD
When the redder angle is different from the position of the helm
考题
单选题When air becomes trapped in the hydraulic fluid of a steering system, the （）.A
rudder will respond sluggishlyB
hydraulic rams will over-speedC
sight glass will show bubblesD
ram relief valves will lift
考题
单选题In an elector-hydraulic steering system, rudder shock is limited by（）A
a differential gearB
return springsC
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relief valves
考题
单选题Which of the following types of hydraulic pumps would be used in a steering system?（）A
LobeB
ScrewC
Radial pistonD
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考题
单选题In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.A
trick-wheelB
follow-up controlC
six-way valveD
Rapson slide
考题
单选题If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.A
trick wheelB
accumulatorC
standby pumpD
telemotor
考题
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.A
a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
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