In () pumps a closed discharge valve will cause bursting discharge pressure.
相似题目
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The purpose of the wearing rings used in a centrifugal pump is to ().
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Which of the following types of hydraulic pumps would be used in a steering system?()
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It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump ().
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The oil was pumped up in the settle tank such a height that it ().
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The usual symptoms of cavitation in a centrifugal pump is ().
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Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
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After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?()
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The pressure head of a pump is given in the unit of ().
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Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?() (1) gear (2) centrifugal (3) screw
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A double suction centrifugal pump impeller has been installed in the reverse direction, and will ().
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What is a function of the wearing rings used in most centrifugal pumps?()
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Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?() (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build up
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Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires()
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Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of().
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In a radial piston pump, reversal and control of fluid flow are accomplished by moving the ().
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Operating a rotary pump at speeds in excess of design requirements could cause().
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A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
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Movement of the pump control rack in a fuel injection system using individual plunger-type pumps ()
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In a vacuum boiling evaporator, the fresh water generated is pumped out by ().
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Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the()
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The pressure head of a water pump is given in the unit of ().
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The static suction lift of a pump is the difference in elevation between the ().
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In reading a weather map,closely spaced pressure gradient lines would indicate().
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The metal powder is compacted by placing in a closed()cavity under pressure in powder
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