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单选题
The static suction lift of a pump is the difference in elevation between the （）.
A
centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
B
centerline of the pump and the suction liquid level when the source of liquid is above the pump
C
centerline of the pump and the level of the discharge liquid
D
liquid levels of the suction and discharge
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更多 “单选题The static suction lift of a pump is the difference in elevation between the （）.A centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpB centerline of the pump and the suction liquid level when the source of liquid is above the pumpC centerline of the pump and the level of the discharge liquidD liquid levels of the suction and discharge” 相关考题
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Which of the following terms is used to identify the pressure of the liquid entering a pump?A.Suction headB.Pump headC.Discharge headD.Total head
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All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves
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You start a centrifugal cargo pump to discharge cargo．The pump works for a while and then loses suction．This could be caused by ______．A.The pump running backwardsB.Incomplete primingC.The discharge head being too highD.All of the above
考题
单选题A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.A
have a greater head capacityB
operate with increased impeller efficiencyC
discharge through the suction side of the pump casingD
require more power to run the shaft
考题
单选题A centrifugal bilge pump requires priming （）.A
primarily to lubricate the shaft sealsB
due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC
to initially unload the pump by having its head pressure equal to discharge pressureD
in order to overcome the potential energy of water in the discharge line
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单选题Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.A
filledB
evacuatedC
compressedD
charged
考题
单选题Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.A
cavitationB
electrolysisC
abrasionD
corrosion
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
vent the pump casingD
open the pump suction and discharge valves
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the filter is cloggedB
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suction value and discharge value of the pump do not open fullyD
screw pump is worn seriously and volumetric efficiency is decreased
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between the suction and dischargeB
below the liquid supplyC
above the liquid supplyD
any of the above
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单选题What does the term head mean when applied to a fire pump?（）A
Length of the discharge pipeB
Height of the discharge pipeC
Difference between the discharge and suction pressuresD
Sum of discharge and suction pressures
考题
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gross pump misalignment
考题
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head capacity to improveB
discharge to be reversedC
efficiency to decreaseD
slippage to decrease
考题
单选题In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.A
positive headB
negative suction headC
mechanical sealD
vent valve attached to the casing at the top of the volute
考题
单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
between the pump and suction valve
考题
单选题The static suction head of is the （）A
distance of the suction liquid level above the line of the pumpB
distance the suction liquid level is below the center line of the pumpC
force necessary to overcome frictional losses in the pump and pipingD
amount in inches of mercury the total suction head is below atmospheric pressure
考题
单选题Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）A
The pump delivers full capacity when started, but gradually slackens off toan abnormally low flowB
The pump packing gland overheats after short operating periodsC
The motor over-current protective device continually shuts the pump downD
Pounding noises can be heard at the pump suction chest
考题
单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.A
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
单选题The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）A
the sensor of low oil level is fully covered by sludgeB
the coarse strainer before the pump in suction system is cloggedC
the screw pump is worn seriously and volumetric efficiency is decreasedD
bilge suction value is clogged
考题
单选题If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.A
the circuit breakerB
for leaks in the suction pipingC
relief valve is not properly seatedD
the suction strainer
考题
单选题Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A
Increased suction head pressureB
Decreased feedwater temperatureC
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Excessive feedwater temperature
考题
单选题The pressure of a liquid leaving the pump can be referred to as the （）.A
total headB
discharge headC
net positive suction headD
suction head
考题
单选题A simple pumping system consists of a suction branch, a pump and （）.A
a priming deviceB
a discharge branchC
a filterD
a suction valve
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