Low pressure air is usually taken thro...

单项选择题Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.

A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves

点击查看答案

您可能感兴趣的试卷

你可能感兴趣的试题

1.单项选择题A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.

A.a sewage treatment plant
B.the extended aeration process
C.the liquor
D.the bubbling air

点击查看答案

2.单项选择题Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.

A.in boiler drums
B.in refrigerating plants
C.in starting air pipes
D.in air coolers

点击查看答案

3.单项选择题Air reservoirs are designed, built and tested similarly to （）.

A.boiler drums
B.hot wells
C.condensers
D.evaporators

点击查看答案

4.单项选择题The air reservoirs must have （） fitted to prevent rupture in the event of fire.

A.high pressure alarm
B.fire alarm
C.extinguishers
D.fusible plugs

点击查看答案

5.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

点击查看答案

6.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

点击查看答案

7.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

点击查看答案

8.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

点击查看答案

9.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

点击查看答案

10.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

点击查看答案