Air trapped in the hydraulic fluid of a steering system may be indicated by（）

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  A . Dissipate heat B . Trap foreign matter C . Separate air from the oil D . All of the above

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• Which of the following can be used in hydraulic transmission system?（）

  A . Hydraulic oil B . Animal oil C . Light oil D . Fuel oil

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• 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 characteristic

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• The purging of air from an elector-hydraulic steering gear unit is necessary when（）

  A . changing over to hand pump operation B . engaging the trick wheel C . the system has been filled with new oil D . the rudder angle indicator does not match the helm positio

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• Air bubbles in a hydraulic governor can cause （）

  A . sluggish response B . speed droop variations C . isochronous governing D . sensitivity increase

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• In a fixed displacement axial piston hydraulic motor, the speed is varied by（）

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• The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to （）.

  A . transmit the rudder angle to the bridge indicator B . prevent the control linkage from striking the stops when hard over C . automatically purge all entrained air from the system D . send hydraulic signals to the receiving unit

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• Air trapped in the hydraulic fluid of a steering system would be indicated by（）

  A . an improper rudder response B . hammering noises in the equipment or transmission lines C . popping or sputtering noises D . all the above

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• Structural traps are traps（）are formed because of a deformation in the rock layer （）contains the hydrocarbons.

  A . that, that B . what,what C . what,that D . that,what

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• The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）

  A . compensate for low oil level B . increase governor promptness C . prevent governor hunting D . limit engine load

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• Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.

  A . control the back pressure of return oil B . lock the oil lines under some conditions C . change the direction of oil flow D . act as relief valve

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• If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）

  A . rack position should be adjusted B . compensating needle valve should be opened fully compensating C . needle valve should be adjusted to stabilize operation D . speed limiting device should be adjusted

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• Hydraulic pumps most commonly used in steering systems are of the （）.

  A . lobe type B . screw type C . axial piston type D . volute type

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• The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）

  A . dirt B . fuel oil C . governor cooling water D . fuel oil tar

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• The major source of chemical contaminants in hydraulic fluid is （）.

  A . microscopic steel shavings B . abrasive waste C . anti-oxidant compounds D . oxidation by-product

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• In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.

  A . trick-wheel B . follow-up control C . six-way valve D . Rapson slide

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• The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.

  A . causes colloid suspension in the cooling water B . reduces the capability of the lubrication system C . can form pockets which block the flow of coolant through the system D . leads to the scuffing of cylinder wall

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• 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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• In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.

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• In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause （）.

  A . molecular fluid vibration B . energy losses C . wide pressure variations D . mechanical damage to control valve

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• Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）

  A . maximum power at a normal load B . maximum power and load under normal conditions C . half speed and normal temperature D . normal operating temperature without a load

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• When air becomes trapped in the hydraulic fluid of a steering system, the （）.

  A . rudder will respond sluggishly B . hydraulic rams will over-speed C . sight glass will show bubbles D . ram relief valves will lift

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• In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

  A . by an fuel valve B . through an inlet valve C . with an exhaust valve D . from an outlet valve

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• In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in（）

  A . the pump going to full stroke B . closing of the six-way valve C . driving the rams up against the stops D . a corresponding slowing or increasing of the pumped flow rate

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