APU LOW OIL PRESSURE”灯何时亮是正常的（）？

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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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• 如果出现“LOW OIL LEVEL”（滑油油面低）ECAM咨询信息，APU是否可用（）

  A . 仍然可以起动APU并使用，在APU继续操作的10个小时内需要进行维护 B . APU不能使用，应人工关车 C . APU会自动关车

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• The device used for low-pressure control and high-pressure cutout on a compressor is called （）.

  A . cutout B . controller switch C . pressure controller D . cutout switch

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• （EMB145）信息“E 1（2）OIL LOW PRESS”从哪里触发？（）

  A . 装在FCOC上的压力传感器 B . 装在FCOC上的压力电门 C . 装在FCOC上的压力传感器或压力电门

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• 当ECAMAPU页面出现LOW OIL LVL时，仍然有足够的滑油供APU工作小时（）

  A . A、5秒 B . B、8秒 C . C、10秒

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• The refrigeration system low pressure cutout switch is actuated by （）.

  A . an electric system manager B . a sensing bulb at the tail coil of the evaporator C . pressure changes in the suction line D . failure of the king solenoid valve

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• （） are more suitable for large quantities at low pressure.

  A . Reciprocating pumps B . Rotary pumps C . Centrifugal pumps D . Gear pum

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• P5板上FLT CONTROL LOW PRESSURE表明（）

  A . 仅说明相应液压系统到副翼、升降舵、方向舵相应的液压出现低压 B . 仅说明相应液压系统到方向舵的油路出现低压。将电门放置在STAND BY RUD位时，当备用方向舵关断活门打开时灯灭 C . 相应液压系统到副翼、升降舵、方向舵相应的液压出现低压。将电门放置在STAND BY RUD位时，当备用方向舵关断活门打开时灯灭 D . 相应液压系统到副翼、升降舵、方向舵相应的液压出现低压。将电门放置在STAND BY RUD位时，当备用方向舵关断活门打开时灯亮

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• 当滑油量低于多少时出现“LOW OIL LEVEL”闪烁指示，这时需要给APU加滑油（）

  A . 3.9夸脱； B . 4.9夸脱； C . 5.9夸脱。

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• APU工作期间，“APU LOW OIL PRESSURE”灯亮：（）.

  A . A、要求机组关掉APU B . B、可以继续使用APU，但不能使用APU引气 C . C、要求机组将APU电门放到”OFF”位后，再放到”START”位1-2秒松手 D . D、APU自动关车

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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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• Low compression pressure in a diesel engine is caused by（）

  A . low water in the expansion tank B . improperly seated valves C . low fuel oil pressure D . worn or broken cylinder liner sealing ring

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• Low compressor head pressure in a refrigeration system can be caused by（）.

  A . insufficient condenser cooling water B . excessive condenser cooling water C . air in the refrigeration system D . excessive refrigerant in the system

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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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• Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.

  A . (1) and (2) B . (1) only C . (2) only D . (1),(2) and (3)

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• Broken valve strips in an operating low pressure, air compressor will cause （）.

  A、an immediate crankcase explosion B、oil contamination in the compressed air C、a decrease in compressor capacity D、no immediate loss of the compressed air capacity

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• Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.

  A . cast iron has weakness B . cast iron can stand up shock loading C . cast iron fittings are only suitable in low pressure situation D . east iron fittings are not suitable in low pressure situatio

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• Low compression pressure in a diesel engine can be caused by（）

  A . improperly seating intake valves B . leaking cylinder liner seal rings C . late fuel injection timing D . carbon deposits on the pisto

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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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• High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）

  A . improper fuel rack positing B . lengthy exhaust valve duration C . extend operation at light load D . excessively early injection timing

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• 207. The greater the pressure difference between a high and a low pressure center, the ______ .

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• Leaky exhaust valve will result in which of the following？①high exhausttemperature ②low compression ③low firing pressure

  A.① and ② B.② and ③ C.① ② and ③

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• When the pressure gets low, the boiling-point becomes low. 气压变低，沸点就变低。

  A．omission B．combination C．addition D．obverse

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• （APS2000)“APU LOW OIL PRESSURE”灯何时亮是正常的？APU电门放在"ON"位而APU还没有工作时

  APU关车后 APU起动期间滑油压力上升到正常之前 任何时候亮都是不正常的

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