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单选题
If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.
A
motor overload would open
B
relief valve would open
C
pump would eventually overheat
D
motor would overheat
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单选题A centrifugal bilge pump requires priming （）.A
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diameter of the discharge piping, with all other factors remaining the sameB
diameter of the suction piping, with all other factors remaining the sameC
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考题
单选题All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.A
set the relief valveB
check the lubrication systemC
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单选题If you were operating a centrifugal water service pump with worn wearing rings, the （）.A
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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
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gross pump misalignment
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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
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The pump packing gland overheats after short operating periodsC
The motor over-current protective device continually shuts the pump downD
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单选题If a centrifugal pump were continually operated with the discharge valve closed, the （）.A
motor controller overload would openB
pump would eventually overheatC
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motor would overheat
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单选题Oil water separators are used to ensure that ships don’t discharge oil when （） bilge water.A
to pump offB
being pumpedC
pumping outD
it pumping out
考题
单选题One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the （）.A
motor overload will openB
relief valve will openC
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motor will overheat
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单选题A centrifugal pump can’t supply water after startingYou should check （）.A
priming waterB
power supplyC
packing glandD
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