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A screw pump belongs to （） according to its working principle.
A . reciprocating pumps
B . positive displacement pumps
C . centrifugal pumps
D . centripetal pum
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Under rotary pumps are the gear, （）, cam-and-piston and screw types.
A . reciprocating
B . diffuser
C . turbine
D . vane
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（）are used to ensure that ships don’t discharge oil when pumping out oily water from any oil contaminated space.
A . Boiler
B . Incinerator
C . Oily water separator
D . Sewage treatment unit
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One of the main differences between the various types of screw pumps is in the （）.
A . stuffing box diameter
B . direction of rotation of the screws
C . pitch of the screws
D . type of driving gear
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Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screw
A . （1）and（2）
B . （1），（2）and（3）
C . （1）and（3）
D . （2）and（3）
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When starting a reciprocating pump, the inlet valve should be （）.
A . closed
B . opened fully
C . cracked open
D . partly ope
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A distinguishing feature of an educator, when compared to other pumps, is the （）.
A . dischargeendbeingsmallerthanthesuctionend
B . smallsizeofimpeller
C . lackofmovingparts
D . easeatwhichthewearingringsmaybechanged
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Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A . open the bypass line
B . cut in the lube oil cooler
C . pressurize the lube oil system
D . top off the expansion tank
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Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.
A . open the steam line mot valve
B . drain the steam cylinder
C . close the steam cylinder drains
D . open the liquid cylinder drai
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The amount of fluid delivered by a screw pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the rotor
C . either A or B
D . None of the above is tree
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When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
A . air chamber
B . head lank
C . primer
D . prime mover
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When carrying out mooring trial, if the M√Ecan’t start normally, you should （）
A . take a further inspection in the voyage
B . check and repair, then retrial
C . do as the surveyor’s requirement
D . retrial
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When operating with a negative suction head, which of the following types of pumps will require priming?（）
A . Reciprocating
B . Centrifugal
C . Rotary
D . Gear
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Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.
A . a level controller
B . a temperature switch
C . a pressure switch
D . a floating ball
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The gear and screw pumps are classified as （）.
A . variable stroke pumps
B . multistage pumps
C . positive displacement pumps
D . triple-ported pum
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When starting a centrifugal pump, the discharge valve should be （）.
A . closed
B . opened fully
C . cracked open
D . partly ope
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The gear, screw, and vane pumps are all classified as （）.
A . variable stroke pumps
B . multistage pumps
C . positive displacement pumps
D . triple-ported pum
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The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A . crankshaft
B . camshaft
C . piston rod
D . rack and pinio
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What does the term head mean when applied to a fire pump?（）
A . Length of the discharge pipe
B . Height of the discharge pipe
C . Difference between the discharge and suction pressures
D . Sum of discharge and suction pressure
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A pump is said to have "negative suction head" when the pump is located （）.
A . between the suction and discharge
B . below the liquid supply
C . above the liquid supply
D . any of the above
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Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal
A . (1)only
B . (1)and(2)
C . (1),(2)and(3)
D . (2)and(3)
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When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?（）
A . The pistons reciprocate
B . The ‘B’ end cylinder barrel rotates
C . There is no fluid flow
D . Power is transmitted hydraulically
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A fire starts when the following （） factors come together.
A . combustible material
B . ignition source
C . oxygen
D . A and B and C
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Your vessel is taking on fuel oil when a small leak develops in the hose and you have ordered the pumping stoppedBefore resuming pumping，you should（）.
A . notify the terminal superintendent
B . place a large drip pan under the leak and ping the scuppers
C . repair the hose with a patch
D . replace the hose
