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 usual symptoms of cavitation in a centrifugal pump is （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
A pressure drop through the refrigerant liquid line may cause （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Which of the following statements is correct concerning heat transfer?（）
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.