maintaining a steadier speed
delivering liquids over greater distances
operating for longer periods of time
producing a smoother discharge flow
第1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
第2题:
The amount of fuel delivered by a helical plunger fuel injection pump is controlled by ______.
A.varying the pump discharge pressure
B.varying the pump return pressure
C.rotation of the pump plunger
D.rotation of the pump barrel
第3题:
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
第4题:
changing over to hand pump operation
engaging the trick wheel
the system has been filled with new oil
the rudder angle indicator does not match the helm position
第5题:
ram relief valves bypass oil to stop rudder movement
six-way valve shifts to the neutral flow position
steering pump electric motor is de - energized by the transfer switch
follow-up gear takes the hydraulic pump off stroke
第6题:
A spur gear pump should be operated with the discharge valves ______.
A.slightly opened
B.throttled
C.fully opened
D.halfway opened
第7题:
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
第8题:
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
第9题:
The six-way valve opens
The steering service pump motor is stopped
The follow-up gear takes the pump off stroke
The cylinder relief valves bypass oil to the suction side the pump
第10题:
allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque
prevent either main pump from being hydraulically motored when idle by cross pressure flow
prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system
all of the above