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单选题
An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.
A
maintaining a steadier speed
B
delivering liquids over greater distances
C
operating for longer periods of time
D
producing a smoother discharge flow
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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
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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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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
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
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考题
单选题Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.A
They are less expensiveB
They are smaller for equivalent pumping abilityC
They pump more cargo in less timeD
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考题
单选题The control rod of a steering gear pump is attached at its outer end to （）.A
the hunting gearB
the rudder stockC
the rudder controllerD
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单选题The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.A
the pump cylinderB
the pump camC
the pump plungerD
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单选题If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.A
low compressionB
failure of the fuel pump to discharge fuelC
incorrect timing of fuel pumpD
turning gear being still on
考题
单选题Dual electro-hydraulic steering units usually operate （）.A
with both pumps on line at the same timeB
with one pump on standbyC
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commonC
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throttling the pressure lineB
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考题
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takes the pump off stroke when the desired rudder angle is attainedC
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returns the rudder to midposition when the wheel is released
考题
单选题（） is (are) not power supplied by main switchboard directly.A
Steering gear and windlassB
Navigation light and radio power panelC
Navigation device power boxD
Daily fresh water pump
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
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaftC
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
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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 the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is（）A
in motion, providing a null inputB
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考题
单选题With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）A
Only one pump should be used at any timeB
The ship speed should be reduced to 70% of the normalC
Watch keeping of the steering gear should be increasedD
Limitations of the steering gear should be logged but the bridge need not be informed
考题
单选题A spur gear pump should be operated with the discharge valves （）.A
slightly openedB
throttledC
fully openedD
halfway opened
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In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in（）A
the pump going to full strokeB
closing of the six-way valveC
driving the rams up against the stopsD
a corresponding slowing or increasing of the pumped flow rate
考题
单选题The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）A
varying the pump discharge pressureB
varying the pump return pressureC
rotation of the pump plungerD
rotation of the pump barrel
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