单选题A gear pump belongs to () according to its working principle.Areciprocating pumpsBpositive displacement pumpsCcentrifugal pumpsDcentripetal pumps

单选题
A gear pump belongs to () according to its working principle.
A

reciprocating pumps

B

positive displacement pumps

C

centrifugal pumps

D

centripetal pumps


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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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A spur gear pump should be operated with the discharge valves ______.A.slightly openedB.throttledC.fully openedD.halfway opened

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单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the().Aram relief valves bypass oil to stop rudder movementBsix-way valve shifts to the neutral flow positionCsteering pump electric motor is de - energized by the transfer switchDfollow-up gear takes the hydraulic pump off stroke

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单选题“The use of a poor quality oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in turn results in a considerable reduction in heat transfer with subsequent overheating and thermal cracking” According to this sentence, we can know that the principle reason of the overheating and thermal cracking is()Athe use of a poor quality oilBthe deterioration of its propertiesCthe formation of depositsDthe reduction in heat transfer ability

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单选题In relation to cargo gear,what does SWL mean?().ASafe working loadBShip's working liftCStarboard wing liftDStress,weight,load

单选题An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of ().Amaintaining a steadier speedBdelivering liquids over greater distancesCoperating for longer periods of timeDproducing a smoother discharge flow

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单选题The control rod of a steering gear pump is attached at its outer end to ().Athe hunting gearBthe rudder stockCthe rudder controllerDthe feedback unit

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单选题()belongs to emergency power supplying equipments.AEmergency fire pumpBWindlassCMain sea water pumpDFresh water pump

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