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单选题
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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Which statement is NOT true?A.While displacement pump works, volume of the working chamber will increase and decrease alternatelyB.A gear pump always has two gearsC.Any vane pump will have a rotor within a ringD.A balanced vane pump has two outlet ports and they are positioned symmetrically
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单选题Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: （） (1)reciprocating (2)vane (3)gearA
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（1），（2）and（3）
考题
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
ram relief valves bypass oil to stop rudder movementB
six-way valve shifts to the neutral flow positionC
steering pump electric motor is de - energized by the transfer switchD
follow-up gear takes the hydraulic pump off stroke
考题
单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）A
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The steering service pump motor is stoppedC
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The cylinder relief valves bypass oil to the suction side the pump
考题
单选题The purging of air from an elector-hydraulic steering gear unit is necessary when（）A
changing over to hand pump operationB
engaging the trick wheelC
the system has been filled with new oilD
the rudder angle indicator does not match the helm position
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crankshaftB
camshaftC
piston rodD
rack and pinion
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function when the rudder is amidshipsB
relieve excess whip pressure from the hydraulic oil systemC
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relieve excessive telemotor pressure
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reduce radial thrust to the impellerB
double the liquid velocity through the pump when compared to a single voluteC
reduce hydraulic end thrustD
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单选题Which of the following statements about pump operations is NOT a correct statement?（）A
In order for a fluid to be pumped, a fluid must be made to flowB
A substance must be cold in order for it to be pumpedC
The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic systemD
A pump must receive its energy from an external source
考题
单选题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 torqueB
prevent either main pump from being hydraulically motored when idle by cross pressure flowC
prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the systemD
all of the above
考题
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excessive internal leakage in the pumpB
low discharge pressure and fluid flowC
excessive fluid level in the hydraulic reservoirD
operation of the pump at 100% efficiency
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facilitate bi-directional operationB
provide the greatest pump efficiencyC
prevent pump clogging from marine growthD
prevent cavitation at the pump outlet
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单选题Dual electro-hydraulic steering units usually operate （）.A
with both pumps on line at the same timeB
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a reciprocating pumpB
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单选题How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）A
clean the fittings before they are disconnectedB
Place drip pans under leaky fittingsC
Seal any cracks in lines with PermatexD
Coat all threads with graphite oil
考题
单选题The follow-up gear on an electro-hydraulic steering gear（）A
relieves excessive fluid pressureB
takes the pump off stroke when the desired rudder angle is attainedC
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考题
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maximum working temperatureB
minimum working temperatureC
the jointD
the insulating material
考题
单选题Which of the following statements is/are true regarding hydraulic pumps in general? （）A
Variable volumes can be obtained with gear pumps only by variation of the pump drive speedB
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The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plateD
All of the above
考题
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.A
increased pump speedB
excessive pump discharge pressureC
too low of a tilting box angleD
low pump speed
考题
单选题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 housingA
(1) onlyB
(2) onlyC
(1) and (2)D
(1),(2)and(3)
考题
单选题As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.A
circularB
ellipticalC
rectangularD
hexagon
考题
单选题A vane pump belongs to （） according to its working principle.A
reciprocating pumpB
positive displacement pumpC
centrifugal pumpD
centripetal pump
考题
单选题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 torqueB
on the purge and vent strokeC
in the neutral positionD
rotating backwards
考题
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.A
a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
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