The pressure difference before and after the lube oil filter indicates （）the filter should be cleaned.

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  A . join with B . mix C . be equal to D . be constant

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• During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）

  A . effective cylinder scavenging and cooling B . constant pressure from the turbochargers C . cooler operation of the exhaust system D . effective constant pressure for turbocharger operatio

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

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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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  A . the filter is clogged B . bilge suction value is clogged C . suction value and discharge value of the pump do not open fully D . screw pump is worn seriously and volumetric efficiency is decreased

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  A . shaft and impeller B . motor and pump shaft C . casing and impeller wearing rings D . lantern ring and impeller

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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 pump discharge pressure will be considerably higher than the pressure at the （）.

  A . pump entry branch B . outlet pipe C . impeller D . None of the above is true

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• The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

  A、one valve seats upwards, while the other seats downwards B、the reed valves used on the discharge are made substantially thicker and heavier than thesuction valves C、the suction valve springs exert a greater tension than the discharge valve springs D、the discharge valve springs exert a greater tension than the suction valve springs

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  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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• 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 . the lubricating pumps are stopped and the access doors are opened B . the lubricating pumps are running and the access doors are opened C . the engine is running and the access doors are closed D . the engine is stopped and the access doors are closed

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  A . refrigerant overcharge B . overfeeding by the expansion valve C . a restricted suction strainer D . due to short cycling of the compressor

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

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  A . the pulse-phase system B . the pulse Doppler system C . the pulse system D . the pulse interval

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• not only how they were being _9_ but also who was benefiting from the societal pressure to be thin.

  第9空答案是：

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