英译汉：hydraulic

相似题目

• A variable displacement system of hydraulic drives consists of （）.

  A . a variable displacement axial piston pump B . a constant displacement axial piston pump C . a reciprocating piston pump D . a centrifugal pum

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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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• Dual electro-hydraulic steering units usually operate （）.

  A . with both pumps on line at the same time B . with one pump on standby C . with the follow-up gear disconnected D . only when the rudder is moved amidshi

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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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• One function provided by a hydraulic accumulator is to（）

  A . provide an area where air can separate from the oil B . provide an area to separate solid contaminants from the oil C . act as an oil and water separator D . absorb shocks occurring in the system

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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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• The most common contaminate of governor hydraulic fluid is （）.

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

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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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• Overheating of a hydraulic system may be a result of （）.

  A . changing pump discharge pressure in response to normal load variations B . a high oil level C . incorrect fluid viscosity D . continued slow re-circulation of the oil

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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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• The item（）is not the advantage of the hydraulic winch．

  A . less jerky starts B . less jerky stops C . overheating worries D . none of the overheating worrie

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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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• A hydraulic accumulator is designed to（）.

  A . store fluid under pressure B . act as a fluid reservoir C . provide overpressure relief D . replenish fluid to a system

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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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• 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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• A hydraulic machine is one that uses （） to do work.

  A . liquid B . steam C . gas D . electricity

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• 水压力（hydraulic pressure）

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• Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.

  A . fluid friction B . fluid turbulence C . component misalignment D . pressure surge

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• 水力混合（hydraulic mixing）

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• The hydraulic （） is used to control engine speed.

  A . motor B . pump C . governor D . capsta

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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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• 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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• 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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• Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to .

  A.allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque B.prevent either main pump from being hydraulically motored when idle by cross pressure flow C.prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system D.all of the above

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