单项选择题
A.motor controller overload would open B.pump would eventually overheat C.relief valve would continuously cycle open D.motor would overheat
A double suction centrifugal pump impeller has been ins...
单项选择题A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.
A.have a greater head capacity B.operate with increased impeller efficiency C.discharge through the suction side of the pump casing D.require more power to run the shaft
Hydraulic machinery failures are commonly caused by mis...
单项选择题Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.
A.hydraulic fluid contamination B.excessive fluid friction C.turbulent fluid flow D.fluid pressure surges
Air compressor receivers should be “blown down” at leas...
单项选择题Air compressor receivers should be “blown down” at least （）.
A.yearly B.quarterly C.monthly D.daily
