单项选择题
The suction - force principle of operation is a typical characteristic of （）.
A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
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相关考题
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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 -
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
