Before liquid can flow into a pump, th...

单项选择题Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.

A.filled
B.evacuated
C.compressed
D.charged

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1.单项选择题Generally speaking, suction heads require to be （） for high speed or large capacities than for low speed or small capacities.

A.greater
B.smaller
C.better
D.worse

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2.单项选择题Some of the energy fed into the pump will be dissipated as （） due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity.

A.hydraulic head
B.static head
C.heat energy
D.steam

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3.单项选择题Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means （）.

A.a liquid
B.a pressure
C.a temperature
D.none of the above

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4.单项选择题A simple pumping system consists of a suction branch, a pump and （）.

A.a priming device
B.a discharge branch
C.a filter
D.a suction valve

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5.单项选择题A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.

A.pump
B.engine
C.turbine
D.boiler

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6.单项选择题Lubricating oil systems are fitted with a wide variety of strainers some of which can be cleaned in site while others have replaceable cartridgesThe bold and italic word “which” means （）.

A.lubricating oil
B.lubricating oil systems
C.strainers
D.cartridges

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7.单项选择题In many installations basket strainers consist of a cylindrical container in which a perforated metal or wire basket is suspendedThe bold and italic word “which” means （）.

A.installations
B.basket strainers
C.a cylindrical container
D.a metal or wire basket

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8.单项选择题Strainers, sometimes called （）, are devices designed to prevent the passage of unwanted solids into or further along a system.

A.dampers
B.filters
C.stopper circuits
D.separators

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9.单项选择题A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.

A.check valve
B.non-return valve
C.steam trap
D.quick closing trap

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10.单项选择题Fuel oil tanks must be fitted with （） that can be closed rapidly and remotely in the event of an emergency such as a fire.

A.stop valves
B.non-return valves
C.quick closing valves
D.relief valves

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