If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.

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• If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）

  A . have a larger than normal dead band B . produce excessive speed response to a load change C . respond slowly to any change in engine load D . stabilize engine speed at the new governor setting

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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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• Which of the following problems will occur if the internal drain at either end of a hydraulic, two-way, spool-type directional control valve cylinder were to become plugged?（）

  A . The reservoir would become vapor bound B . The valve would be placed in hydraulic lock C . The spring loaded relief ports would open D . The buffering chambers would be unable to functio

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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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• Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）

  A . Correct the cause of the scoring and repair the sleeve or replace with a new one B . Reassemble the unit and provide more water leak off for proper lubrication C . Check for parallel alignment of the sleeve radial faces to the sleeve bores D . Reassemble the unit and adjust the governor to obtain a slower speed

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• If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.

  A . add fluid that is the same color as the fluid in the reservoir B . add turbine oil because it is always a good substitute C . add any oil that has the same viscosity as the hydraulic fluid D . check the winch manufacturers instruction book

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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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• If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

  A . packing gland B . mechanical seals C . lantern rings D . wearing ring

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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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• When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (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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• 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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• The oil is drawn from a drain tank through （）, one of a pair of pumps, into one of fine filters.

  A . a strain tank B . a head tank C . a service tank D . a strainer

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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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• 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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• With reference to a radial piston pump, which one of the following statements is false?（）

  A . Surrounding the fixed shaft is a hollow shaft B . This hollow shaft carries radial bores C . Each bore is fitted with a well-lapped plunger D . There are always even numbers of bore

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• If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）

  A . insufficient speed B . cavitation C . excess discharge pressure D . excessive net positive suction head B

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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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• If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）

  A . only the replacement of the entire pump would be acceptable B . the injection pump and injection nozzle must be replaced C . either the barrel or plunger must be replaced D . the barrel and plunger must be replaced as a unit

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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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• 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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• 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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