kinetic；pressure
kinetic；essential
pressure；kinetic
pressure；height
第1题：
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 backwards
B.Incomplete priming
C.The discharge head being too high
D.All of the above
第2题：
Oil is discharged from the impeller through the outlet
Gravity causes the oil to flow toward the discharge
The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
The discharge capacity varies directly with the speed of the impeller
第3题：
Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.
A.suction
B.exhaust
C.pressure
D.discharge
第4题：
heated gases flowing through ventilation syetem
the transfer of heat across an unobstructed space
burning liquids flowing into another space
transmitting the heat of a fire through the ships metal
第5题：
discharges into a gradually widening channel
has stationary diffuser vanes
produces no kinetic energy
All of the above are true
第6题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
第7题：
reduce radial thrust to the impeller
double the liquid velocity through the pump when compared to a single volute
reduce hydraulic end thrust
provide the effect of multi-staging
第8题：
All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．
A.Set the relief valve
B.Check the lubrication system
C.Vent the pump casing
D.Open the pump suction and discharge valves
第9题：
have a greater head capacity
operate with increased impeller efficiency
discharge through the suction side of the pump casing
require more power to run the shaft
第10题：
Alaska Current
Subarctic Current
Kuroshio Current
Oyashio Current