A.lantern rings
B.bearings
C.easing volutes
D.wearing rings
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A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings
A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve
A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling
A.A power end and fluid end
B.A propeller and educator
C.A volute and impeller
D.A turbine and piston
A.water seal pipe is plugged
B.pump is not primed
C.seal ring is improperly located
D.impeller is flooded
最新試題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
A grease gun is generally used to lubricate a （）.
A salinity indicator is used to determine the （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.