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
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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
A.Close radial clearance between impeller hub and casing
B.Low rotational speed of impeller
C.Removable end plate
D.Replaceable impeller and casing wearing rings
A.fill the unit with saltwater
B.fill the unit with de-scaling compound
C.completely drain the unit
D.tightly seal the unit to exclude air
最新試題
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Which of the listed pumps is NOT a positive displacement pump?（）
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
A salinity indicator is used to determine the （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）