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

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  A . scavenging B . starting C . cooling D . blowing

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• For a L√Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will （）.

  A . be interrupted B . move downwards C . move outwards D . retain original positio

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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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• 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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• （）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.

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• If a diesel engines exhaust temperature is abnormally high, the cause could be（）

  A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

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• The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）

  A . inlet nozzle ring B . turbine wheel blade C . diffuser passages D . inlet vol

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

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  A . reaching B . extending C . increasing D . upgrading

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• In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure

  A . Ⅰonly B . Ⅱonly C . bothⅠand Ⅱ D . neitherⅠnor Ⅱ

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• Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）

  A . Improper fuel rack positioning B . Lengthy opening of the exhaust valve C . Excessively early injection timing D . Extended light load operatio

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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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• One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）

  A . increase scavenge air pressure B . reduce fuel booster pump pressure C . adjust the fuel rack D . retard fuel injector timing

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

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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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• 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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• According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and （）.

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

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• You blood pressure is a little high. 译成：

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• For a L.Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will _____.

  A.be interrupted B.move downwards C.move outwards D.retain original position

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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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