motor controller overload would open
pump would eventually overheat
relief valve would continuously cycle open
motor would overheat
第1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：
cavitation
electrolysis
abrasion
corrosion
第5题：
motor overload would open
relief valve would open
pump would eventually overheat
motor would overheat
第6题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
第7题：
a centrifugal fan
a direct expansion cooler
a hermetic compressor
a centrifugal pump
第8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9题：
one size larger than the pump discharge nozzle
the same size as the pump discharge nozzle
one size smaller than the pump discharge nozzle
installed with a short radius elbow at the pump
第10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