reciprocating
hydraulic
turbine
vane
第1题：
Centrifugal pumps have what advantage（s）over reciprocating pumps ________．
A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above
第2题：
Absorb erosion of high velocity discharge stream
Seal pump shaft against entry of air
Isolate the discharge side from the suction side
Dampen the turbulent discharge flow
第3题：
A、servomotore
B、hydraulicmotor
C、gear
D、volute
第4题：
gear
nonpositive displacement
positive displacement
rotary
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：
kinetic；pressure
kinetic；essential
pressure；kinetic
pressure；height
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：
The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the_______.
A.inlet nozzle ring
B.turbine wheel blade
C.diffuser passages
D.inlet volute
第9题：
The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
Rotary pumps occupy only one-half the space of reciprocating pumps
Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
第10题：
They are self-priming
Decreasing the speed of rotation will decrease the discharge pressure
Opening the discharge valve wider will increase the discharge pressure
All of the above