In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.

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• （） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.

  A、Relief valves B、Safety valves C、Check valves D、Reducing valves

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• In its simplest form the pressure reducing valve is opened or closed by （） which is balanced by the downstream pressure acting on a diaphragm.

  A . adjusting a nut B . a pre-tensioned spring C . any spring D . upstream pressure

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• The pressure head of a pump is given in the unit of （）.

  A . kg B . MPa C . meter fluid column D . None of the above is true

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• The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.

  A . below B . above C . equal to D . much larger tha

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• In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

  A . Differential B . Trunk C . Barrel D . Valve-in-head

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• The weather is often（）in a high-pressure area.

  A . fine B . cloudy C . rainy D . windy

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• The atmosphere in the vicinity of a high pressure area is called a(n)（）.

  A . anticyclone B . cold front C . occluded front D . cyclone

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• In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）

  A . its pressure and temperature are both lowered B . its pressure and temperature are both raised C . its pressure is lowered and its temperature is raised D . its pressure is raised and its temperature is lowered

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• In the Southern Hemisphere winds in a low pressure system rotate in a（）.

  A . clockwise direction B . northeasterly direction C . northerly direction D . counterclockwise directio

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• The diurnal pressure variation is most noticeable in the（）.

  A . polar regions B . horse latitudes C . roaring forties D . doldrum

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• In a vacuum distillation system, the case is the higher the pressure, （）.

  A . the saturation temperature is higher B . the higher the saturation temperature C . the higher is the saturation temperature D . the saturation temperature is more high

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• In the common rail system, excessive pressure in the header may be caused by （）

  A . improper adjustment of the bypass valve B . a dribble in the fuel injection nozzle C . insufficient leak-off through injection nozzle packing D . a malfunctioning injection nozzle

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• In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

  A . steam stop valve B . dry pipe C . feedwater system D . generating tube

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• In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.

  A . compressor；condenser B . condenser；evaporator C . throttle valve；evaporator D . evaporator；condenser

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• Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.

  A . first stage B . second stage C . distillate cooler D . salt water feed heater

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• If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.

  A . increase the flow of the cooling water through the condenser B . adjust the high pressure cutout to maintain the desired pressure C . open the hot gas bypass temporarily to reduce capacity D . purge non-condensable gases to reduce the excess pressure

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• A slow rise in the barometric pressure forecasts（）.

  A . rainy weather for the next 48 hours B . high seas C . improving weather conditions D . deteriorating weather conditio

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• The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.

  A . soluble state B . solid state C . liquefied state D . inert state

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• When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.

  A . viscosity will decrease B . volume will increase C . volume will decrease D . pour point will be reduced

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• The pressure head of a water pump is given in the unit of （）.

  A . kg B . MPa C . mH20 D . None of the above

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• The highest pressure in a diesel engine cylinder normally occurs （）.

  A . at TDC B . before TDC C . after TDC D . during air starting

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• In order to improve the working conditions of the crosshead bearings, the bearing pressure is made and the peripheral speed is made in later designs（）

  A . smaller, higher B . higher, smaller C . smaller, smaller D . higher, higher

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• The author suggests in the last paragraph that the effect of peer pressure is______.

  A．harmful B．desirable C．profound D．questionable

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• The metal powder is compacted by placing in a closed（)cavity under pressure in powder

  A．A.plastic B．B.metal C．C.wood D．D.sand

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• The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as_______.

  A.opposing operational drag B.pressure distribution C.differential D.system purge

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