mechanical energy
heat energy
potential energy
kinetic head
第1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 speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
第2题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
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：
a centrifugal fan
a direct expansion cooler
a hermetic compressor
a centrifugal pump
第5题：
kinetic；pressure
kinetic；essential
pressure；kinetic
pressure；height
第6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7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：
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10题：
discharges into a gradually widening channel
has stationary diffuser vanes
produces no kinetic energy
All of the above are true