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单选题
What is a characteristic of all centrifugal cargo pumps? （）
A
They are self-priming
B
Decreasing the speed of rotation will decrease the discharge pressure
C
Opening the discharge valve wider will increase the discharge pressure
D
All of the above
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单选题Regulations require that tankers handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by（）.A
cofferdamsB
empty cargo spacesC
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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
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单选题The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.A
gearB
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单选题液体散货用泵装卸的。（）A
Liquid cargo is loaded and discharged by pumps.B
Liquid cargo is loaded and discharged by tubes.C
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单选题Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.A
They are less expensiveB
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air chamberB
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单选题Which of the following pumps belongs to centrifugal pump?（）A
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Screw pumpC
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考题
单选题Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）A
CopperB
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单选题Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid.A
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empty cargo spacesC
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areas equipped with power ventilation
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