discharges into a gradually widening channel
has stationary diffuser vanes
produces no kinetic energy
All of the above are true
第1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2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3题：
It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause the pump ______.
A.head capacity to improve
B.discharge to be reversed
C.efficiency to decrease
D.slippage to decrease
第4题：
diameter of the discharge piping, with all other factors remaining the same
diameter of the suction piping, with all other factors remaining the same
width of the impeller only
diameter of the impeller
第5题：
two or more impellers housed together in one casing and mounted on a single shaft
a single stepped impeller mounted in a progressively staged casing
a large radial clearance between the impeller and casing to prevent overheating due to
an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
第6题：
kinetic；pressure
kinetic；essential
pressure；kinetic
pressure；height
第7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8题：
A centrifugal pump may fail to deliver water when first started if the ______.
A.water seal pipe is plugged
B.pump is not primed
C.seal ring is properly located
D.impeller is flooded
第9题：
cavitation
electrolysis
abrasion
corrosion
第10题：
maintain radial alignment between the pump impeller and casing
absorb all impeller shaft end thrust
prevent water leakage to the atmosphere
prevent wear of the pump casing and/or impeller