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单选题
The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）
A
rated capacity of that purifier
B
viscosity of the oil being purified
C
maximum design speed of that purifier
D
specific gravity of the oil being purified
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Which tanker discharge pattern would be the safest and most efficient ________．A.Empty the forward tanks and start working aft，emptying each tank in sequenceB.Start discharging with most of the discharge coming from forward，but include some from midships and after tanksC.Start pumping from forward，midships，and aft with the discharge distributed equally among the tanksD.Start pumping from midships and then work forward and aft simultaneously as the midships tank is emptied
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decreases the size of the lineB
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单选题What is a function of the wearing rings used in most centrifugal pumps?（）A
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单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
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单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.A
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the same size as the pump discharge nozzleC
one size smaller than the pump discharge nozzleD
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motor and pump shaftC
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单选题If fuel oil were being discharged from the waster outlet of a fuel oil disk type centrifuge, operated as separator, you should（）A
remove the discharge ringB
re-prime the purifierC
the centrifuge to its proper speedD
install an additional discharge ring
考题
单选题An increase in rotor clearances in a rotary pump will （）.A
increase discharge pressureB
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decrease reaction ring clearance
考题
单选题The discharge head of a centrifugal pump will vary directly with the （）.A
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考题
单选题The discharge rate or capacity of a centrifugal pump will vary directly as the （）.A
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swash plateC
plungerD
cylinder
考题
单选题Which statement is TRUE concerning the tandem working arrangement of pedestal cranes when completing a quad lift? （）A
The discharge is slow due to the size of the cargo and all the cranes working togetherB
The cargo discharge can be accomplished with controlled pendulationC
The cargo discharge can be performed in port or at anchorD
The cranes enable the handling of heavy cargos without shoreside assistance
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reduce the ring groove wear rateB
seal against crankcase vaporsC
lessen the wear on aluminum part of the cylinderD
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one valve seats upwards, while the other seats downwardsB
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the suction valve springs exert a greater tension than the discharge valve springsD
the discharge valve springs exert a greater tension than the suction valve springs
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a very efficient and simple deviceB
much cheaper than a carC
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still used by rich people
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