单项选择题
Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.
A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland
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相关考题
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单项选择题
Tube leaks in the distillate cooler of a two stage flash evaporator will result in （）.
A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser -
单项选择题
The pressure of a liquid leaving the pump can be referred to as the （）.
A.total head
B.discharge head
C.net positive suction head
D.suction head -
单项选择题
The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.
A.slide block
B.tilting box
C.pintle
D.reaction ring
