The rotor of the hydraulic motor rotates at a speed proportional to the （）.

相似题目

• Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）

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

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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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• Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?（）

  A . hydraulic pumps B . valves C . hydraulic cylinders D . hydraulic motor

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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 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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• 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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• 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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• Sluggish response or action of the hydraulic actuators may be a result of （）.

  A . insufficient load B . excessively high oil viscosity C . relief-valve pressure setting too high D . reservoir level being maintained two inches above normal

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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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• 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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• Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?（）

  A . Hydraulic pumps B . Valves C . Hydraulic cylinders D . Hydraulic motor

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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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• 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 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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• 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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• 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 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 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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• Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）

  A . The hydraulic pumps B . Valves C . Hydraulic cylinders D . Hydraulic motor

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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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• The （）, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.

  A . single phase B . two phase C . three phase D . four phase

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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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