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单选题
In most pumps and pump motors overpacking the ball bearings full of grease will result in （）
A
moisture emulsification of the bearing grease
B
insufficient circulation and overheating of the bearing
C
proper grease circulation to cool the bearing
D
sliding friction between balls and races
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单选题Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）A
changes the position of the fuel inlet portsB
changes the length of the pump strokeC
varies the quantity of fuel deliveredD
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单选题Which of the following pumps is most suitable for an oily water separator?（）A
reciprocating pumpB
vane pumpC
mono pumpD
axial-flow pump
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单选题What is a function of the wearing rings used in most centrifugal pumps?（）A
Absorb erosion of high velocity discharge streamB
Seal pump shaft against entry of airC
Isolate the discharge side from the suction sideD
Dampen the turbulent discharge flow
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单选题A screw pump belongs to （） according to its working principle.A
reciprocating pumpsB
positive displacement pumpsC
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考题
单选题Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）A
The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pumpB
Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weightC
Rotary pumps occupy only one-half the space of reciprocating pumpsD
Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
考题
单选题Which of the listed pumps is NOT a positive displacement pump?（）A
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ReciprocatingC
GearD
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考题
单选题Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?（）A
Sealed motorsB
Drip proof motorsC
Enclosed motorsD
Watertight motors
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
All of the above
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 oil pressure and flow from each bearings can be checked when（）A
the lubricating pumps are stopped and the access doors are openedB
the lubricating pumps are running and the access doors are openedC
the engine is running and the access doors are closedD
the engine is stopped and the access doors are closed
考题
单选题Lube oil pumps taking suction from the sump of most small marine engines are usually （）.A
of the diaphragm typeB
of the centrifugal typeC
of the positive displacement typeD
independently driven by electric motors
考题
单选题Overgreasing of ball bearings installed on pumps will result in （）.A
smoother pump operationB
overheating of the bearingC
reduced corrosion in the bearingD
increased pump capacity
考题
单选题The size of ball and roller bearings can be identified by the （）.A
rolling member sizeB
inner race cone widthC
manufacturers numerical codeD
outer ring width
考题
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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
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Screw pumpC
Diffuser pumpD
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考题
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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The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.A
loss of residual magnetismB
absorption of moisture in the insulationC
insulation varnish flakingD
dirt collecting on the windings
考题
单选题Universal motors will operate on AC or DC current, and are generally found in （）A
portable toolsB
large pump motorsC
turbo electric main motorsD
forced draft fans
考题
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
A common rail engine；conventional enginesB
A conventional engine；common rail enginesC
A marine diesel engine；most other enginesD
A two-stroke engine；four-stroke engines
考题
单选题Where is the most probable location of the remote shutdown station for cargo pumps on a tank barge carrying oil（）.A
The loading dockB
The midpoint of the bargeC
Within 25 feet of the pump engineD
Above the forward rake end
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