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单选题
pump（）
A
泵
B
舱
C
压缩机
D
轴
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Which three statements are true about Oracle Data Pump export and import operations?()
A. You can detach from a data pump export job and reattach later.B. Data pump uses parallel execution server processes to implement parallel import.C. Data pump import requires the import file to be in a directory owned by the oracle owner.D. The master table is the last object to be exported by the data pump.E. You can detach from a data pump import job and reattach later.
考题
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
考题
Which statement is NOT true?A.In a simple vane pump, the rotor and cam ring are exactly concentricB.Balanced vane pump has an elliptical cam ringC.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
考题
If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A.Pump only if the discharge is led to a shore tank or bargeB.Pump only during the hours of darknessC.Pump only on the outgoing tideD.Pump only as much as is necessary
考题
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
考题
Cargo pump relief valves are piped to the ______．A.cargo pump pressure gaugesB.crossover lines interconnecting two pumpsC.suction side of pumpsD.atmosphere through pump vents
考题
All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves
考题
单选题Cargo pump relief valves are piped to the（）.A
cargo pump pressure gaugesB
crossover lines interconnecting two pumpsC
suction side of pumpsD
atmosphere through pump vents
考题
单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB
Run the pump at high speed with the discharge valves closedC
Run the turbine at slow speed with the pump disconnectedD
Shut the discharge valve and run the pump at slow speed
考题
单选题The static suction lift of a pump is the difference in elevation between the （）.A
centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpB
centerline of the pump and the suction liquid level when the source of liquid is above the pumpC
centerline of the pump and the level of the discharge liquidD
liquid levels of the suction and discharge
考题
单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.A
one size larger than the pump discharge nozzleB
the same size as the pump discharge nozzleC
one size smaller than the pump discharge nozzleD
installed with a short radius elbow at the pump
考题
单选题Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）A
facilitate bi-directional operationB
provide the greatest pump efficiencyC
prevent pump clogging from marine growthD
prevent cavitation at the pump outlet
考题
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
the pump miler
考题
单选题If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.A
excessive pump speedB
excessive suction headC
worn wearing ringsD
gross pump misalignment
考题
单选题The purpose of the wearing rings used in a centrifugal pump is to （）.A
prevent an internal explosion in the pump when it is overheatedB
enable a visual inspection of the pump while it is runningC
insure a proper alignment of the pump coupling to the driverD
accommodate for friction between the impeller and the easing
考题
单选题The terminal indicates to you that they are going to use a booster pump to assist the discharging operation. You start the discharge，and in a few minutes the pressure drops sharply. This could be a result of the（）.A
booster pump coming on the line and discharging properlyB
booster pump failing to startC
booster pump being lined up in the wrong directionD
ship's pump speeding up
考题
单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
between the pump and suction valve
考题
单选题Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）A
The pump delivers full capacity when started, but gradually slackens off toan abnormally low flowB
The pump packing gland overheats after short operating periodsC
The motor over-current protective device continually shuts the pump downD
Pounding noises can be heard at the pump suction chest
考题
单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.A
one size smaller than the pump suction nozzleB
the same size as the pump suction nozzleC
one size larger than the pump suction nozzleD
installed with a short radius elbow at the pump
考题
多选题Which three statements are true about Oracle Data Pump export and import operations?（）AYou can detach from a data pump export job and reattach later.BData pump uses parallel execution server processes to implement parallel import.CData pump import requires the import file to be in a directory owned by the oracle owner.DThe master table is the last object to be exported by the data pump.EYou can detach from a data pump import job and reattach later.
考题
单选题An increase in rotor clearances in a rotary pump will （）.A
increase discharge pressureB
decrease pump capacityC
decrease pump cavitationD
decrease reaction ring clearance
考题
单选题The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）A
fuel delivery pressureB
pump plunger diameterC
plunger control rack positionD
total pump stroke
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Each fire pump on a ship must have a pressure gauge located at（）.A
the pump dischargeB
the manifold connectionC
each fire station dischargeD
the pump station
考题
单选题On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）A
centrifugal pump is cheaper than reciprocating pumpB
the size of centrifugal pump with same capacity is smaller than that of reciprocating pumpC
centrifugal pump makes maintenance easier than reciprocating pump doesD
all of the above
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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