A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
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A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland
A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser
A.total head
B.discharge head
C.net positive suction head
D.suction head
A.slide block
B.tilting box
C.pintle
D.reaction ring
A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Thermostatic expansion valves can be adjusted for （）.
When the steering gear is in operation, you should （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A salinity indicator is used to determine the （）.
A salinity indicator is used to determine the （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The rate of heat transfer from a hot region to a cold region is affected most by the （）.