High pressure ridge（）from Sevastopol to eastern Libya.

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• High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

  A . decreased piston to cylinder head clearance B . increased exhaust system back pressure C . early fuel injection timing D . low scavenge air temperature

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• （）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.

  A . A common rail engine；conventional engines B . A conventional engine；common rail engines C . A marine diesel engine；most other engines D . A two-stroke engine；four-stroke engine

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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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• One cause of high head pressure occurring in a refrigeration system can be （）.

  A . insufficient cooling water flow to the condenser B . a low refrigerant charge in the system C . the liquid valve is open too much D . high evaporator superheat

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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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• Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? （） (1) faulty condensing (2) too few refrigerant (3) high discharge pressure

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

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• Compared to a low pressure system，generally the air in a high is（）.

  A . warmer，less dense，and less stable B . cool，more dense，and drier C . muggy and cloudy D . extremely moist with high relative humidity

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• As a high pressure system approaches，the barometer reading（）.

  A . stays the same B . falls C . rises D . falls rapidly

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• In general, （） is suitable for delivering small quantities at high pressure.

  A . reciprocating pump B . gear pump C . centrifugal pump D . vane pum

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• Two well-developed high pressure areas may be separated by a（）.

  A . Hill of low pressure B . Trough of low pressure C . Valley of low pressure D . Ridge of low pressure

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• High speed aircraft is made of metals that can（）both high temperature and pressure.

  A . stand by B . put up with C . withhold D . withstand

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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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• 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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• High exhaust back pressure will result in an increase in （）

  A . turbocharger efficiency B . engine power output C . carbon deposits on fuel injectors D . cylinder scavenging

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• In general, （） is suitable for delivering small quantifies at high pressure.

  A . reciprocating pump B . gear pump C . centrifugal pump D . vane pum

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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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• Most high pressure areas are accompanied by（）.

  A . precipitation B . clear，cool weather C . humid，sticky weather D . cool fog

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• 高压液相层析（HPLC，high-pressure liquid chromatography）

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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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