题目内容（请给出正确答案）

[主观题]

For a gear pump,

A．as output pressure increases, overall efficiency decreases

B．as output pressure increases, overall efficiency increases

C．overall efficiency is not affected by output pressure

D．none of the above

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更多“For a gear pump,”相关的问题

第1题

A spur gear pump should be operated with the discharge valves ______.A.slightly openedB.th

A spur gear pump should be operated with the discharge valves ______.

A.slightly opened

B.throttled

C.fully opened

D.halfway opened

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第2题

When received the order "Finished With Engine", which of the following operations is wrong

？

A.stop the L.O pump, S.W pump, jacket water cooling pump immediately

B.stop the F.O booster pump

C.engage the turning gear, turn the main engine

D.open the main engine scavenge air trunk's drain cocks

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第3题

The follow-up gear on an electro-hydraulic steering gearA.relieves excessive fluid pressur

The follow-up gear on an electro-hydraulic steering gear

A.relieves excessive fluid pressure

B.takes the pump off stroke when the desired rudder angle is attained

C.allows for rudder movement faster than the movement of the ship&39;s

D.returns the rudder to amidships when the wheel is release

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第4题

Which statement is NOT true？A.In a simple vane pump, the rotor and cam ring are exactly co

Which statement is NOT true？

A.In a simple vane pump, the rotor and cam ring are exactly concentric

B.Balanced vane pump has an elliptical cam ring

C.Liquid in both gear pump and vane pump are forced out to the outlet.

D.Balanced vane pumps can work at a higher pressure than the simple vane pump

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第5题

The main propulsion diesel continues running after you try to shut down. You should now at

tempt to .

A.stop the fuel oil booster pump

B.engage the jacking gear

C.secure the lube oil pump

D.shut off the fuel at the settling tank

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第6题

Which statement is NOT true？A.While displacement pump works, volume of the working chamber

Which statement is NOT true？

A.While displacement pump works, volume of the working chamber will increase and decrease alternately

B.A gear pump always has two gears

C.Any vane pump will have a rotor within a ring

D.A balanced vane pump has two outlet ports and they are positioned symmetrically

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第7题

Positive displacement, helical gear pumps are well suited for pumping oil becauseA.stuffin

Positive displacement, helical gear pumps are well suited for pumping oil because

A.stuffing boxes eliminate the leakage problems usually associated with other gear pumps

B.it is not necessary to closely maintain design clearances with this pump

C.they are essentially self-priming and produce a high suction lift

D.these pumps are designed with extreme tooth angles

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第8题

As the designated rudder angle is being achieved, as a result of the original command inpu

t, the steering gear follow-up mechanism is ______.

A.in motion, providing a null input

B.not in motion, thus providing a null input

C.in motion, providing an input to place the main pump on maximum stroke

D.in motion, providing an input to place the main pump at null stroke

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第9题

Dual electro-hydraulic steering units usually operate ______．A.With both pumps on line at

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 amidships

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第10题

What are the essential services the emergency generator must be rated to provide power

for()？

A. emergency lighting for occupied areas,navigation lights

B. the driving motors of the emergency bilge pump,fire pumps,and steering gear

C. communications systems and alarm systems

D. all of the above

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