To determine the pressure and temperature limitations under which LFG is required to be transported on a barge，you should look at the（）.

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• The type of gauge most commonly used to measure pressure is the （）.

  A . bimetallic type B . diaphragm type C . bourdon tube type D . resistance-temperature type

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• The purpose of the low pressure cut-out switch is to （）.

  A . maintain liquid refrigerant at the suction of the compressor B . maintain a preset suction pressure to the compressor C . start and stop the compressor at preset operating pressures D . operate at minimum efficiency

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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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• To determine the weight capacity of a deck in a cargo hold，you would refer to the（）.

  A . deadweight scale B . deck capacity plan C . cubic capacity tables D . general arrangement pla

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• The pressure of a liquid leaving the pump can be referred to as the （）.

  A . total head B . discharge head C . net positive suction head D . suction head

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• During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.

  A . ensure penetration and distribution of the fuel in the combustion chamber B . ensure the needle valve is flushed clean during each injection C . prevent combustion gas blowback into the open needle valve D . prevent reflected pressure waves when the needle valve close

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• Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）

  A . Pressure-reducing valve B . Unloading valve C . Counterbalance valve D . Pressure-relief valve

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• The gauge pressure inside a container is -0~5kg/cm2, then what is the absolute pressure exerted to the inside surface of thin container?（）

  A . 0~05Mpa B . 0~95Mpa C . 1~05Mpa D . 0~5Mpa

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• Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）

  A . The condenser and the expansion valve B . The king valve and the solenoid valve C . The compressor and the expansion valve D . The condenser and the solenoid valve

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• The load chart of a crane enables the operator to combine the load radius with boom length to determine the（）.

  A . maximum counter weight required B . minimum horsepower required C . hoist rope strength D . allowable load

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• The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.

  A . gas composition B . gas temperature C . pressure D . timing

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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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• 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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• A salinity indicator is used to determine the （）.

  A . cause of salt contamination B . location of salt water contamination C . chemical makeup of feed-water D . level of alkalinity in condensate

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• When the relief valve opens it discharges high pressure refrigerant vapor to the （）.

  A . liquid strainer B . refrigerant inlet of the condenser C . inlet side of the evaporator D . suction side of the compressor

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• The passing of a low pressure system can be determined by periodically checking the（）.

  A . Thermometer B . Hygrometer C . Barometer D . Anemometer

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• The most common instrument used to measure diesel engine exhaust pressure is the （）

  A . pyrometer B . bourdon gauge C . pneumercator D . manometer

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• The purpose of the refrigeration system low pressure cutout switch is to （）

  A . protect the compressor from liquid flood back B . protect the compressor from low discharge pressure C . start and stop the compressor upon system demand D . start the compressor after a drop in the evaporator pressure

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• （） provides the head or pressure to supply the domestic water where required.

  A . The compressed air B . The compressing air C . The transfer pump D . The head tank

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• 4.The government was determined to -------- with the election.

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• The purpose of the study described in paragraph 2 was to determine

  A．how many hours people can survive without sleep B．how people react when their sleep is interrupted C．the changes in brain activity that occur during sleep D．the effects of sleep deprivation on brain activity

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• When the relief valve is used as a constant pressure valve, it is connected to the outlet of the hydraulic pump to ensure that the outlet pressure of the hydraulic system (pump) is constant.

  A:正确; B:错误

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• What determines your weight according to the first paragraph（）

  A．Your working manner B．Your eating habit C．Your life style D．Your genes

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