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

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• Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.

  A . one size larger than the pump discharge nozzle B . the same size as the pump discharge nozzle C . one size smaller than the pump discharge nozzle D . installed with a short radius elbow at the pum

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• Which of the following types of hydraulic pumps would be used in a steering system?（）

  A . Lobe B . Screw C . Radial piston D . Volute

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• As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （） (1)the rotor (2)the pump shaft (3)the external surface of the housing

  A . (1) only B . (2) only C . (1) and (2) D . (1),(2)and(3)

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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 most common contaminate of governor hydraulic fluid is （）.

  A . moisture B . dirt C . acid D . air

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• 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 amidships B . When the six-way valve is opened C . When the ram relief valves lift D . When the redder angle is different from the position of the helm

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• The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.

  A . sliding block B . pintle C . reaction ring D . tilting box or swash plate

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• Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.

  A . neutral B . end C . opening D . closure

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• If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

  A . a low load on the unit B . a clogged pump suction strainer C . a blockage in the line between the pump and hydraulic motor D . the hydraulic motor turning too fast

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• A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.

  A . the four-way control valve failing to shift B . the bleeder valve sticking in the open position C . cold hydraulic fluid D . a clogged air vent falter on the oil reservoir

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• If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because（）.

  A . a check valve will close that prevents reverse circulation B . a centrifugal counterweight counteracts the force of gravity C . the electric pump motor cut out D . the control lever will move to the stop positio

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• GIS开关储能电机运行时间超过多少秒时会发“Hydraulic pump fail（液压泵故障）”信号？

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• As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.

  A . circular B . elliptical C . rectangular D . hexago

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• If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.

  A . a check valve will close that prevents reverse circulation B . a centrifugal counterweight counteracts the force of gravity C . the electric pump motor will cut out D . the control lever will move to the stop positio

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• Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.

  A . one size smaller than the pump suction nozzle B . the same size as the pump suction nozzle C . one size larger than the pump suction nozzle D . installed with a short radius elbow at the pum

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• 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 wheel B . accumulator C . standby pump D . telemotor

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• An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.

  A . cause loss of hydraulic oil from the system B . result in extreme damage to the pump C . cause damage to the pump ff not continually drained from the pump casing D . result in the system high side pressure to substantially drop off

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• When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.

  A . set for maximum torque B . on the purge and vent stroke C . in the neutral position D . rotating backward

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• In most pumps and pump motors overpacking the ball bearings full of grease will result in （）

  A . moisture emulsification of the bearing grease B . insufficient circulation and overheating of the bearing C . proper grease circulation to cool the bearing D . sliding friction between balls and race

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• If a hydraulic pump is overheating, the cause may be （）.

  A、excessive internal leakage in the pump B、low discharge pressure and fluid flow C、excessive fluid level in the hydraulic reservoir D、operation of the pump at 100% efficiency

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• Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.

  A . controller B . governor C . instrument D . apparatu

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• If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.

  A . excessive drive motor speed B . excessive pump discharge pressure C . too low of a tilting box angle D . insufficient drive motor speed

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• 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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• When the relief valve is used as a constant pressure valve, it is connected to the outlet of the hydraulic pump to ensure that the outlet pressure of the hydraulic system (pump) is constant.

  A:正确; B:错误

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