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

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• The function of the piston compression rings used in a diesel engine is to （）

  A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

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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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• In the Southern Hemisphere winds in a low pressure system rotate in a（）.

  A . clockwise direction B . northeasterly direction C . northerly direction D . counterclockwise directio

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• Fuel oil having a low cetane rating could result in（）

  A . improved cold weather starting B . excessive fuel oil consumption C . reduced ignition lag D . smoother engine operatio

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• Low compression results from （）.

  A . a worn cylinder B . broken piston rings C . either A or B D . none of the above

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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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• A drop in compression pressure in one cylinder of a diesel engine can be caused by（）

  A . a leaking fuel injection nozzle B . a clogged air filter C . early fuel injection D . burned valve

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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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• A sudden drop in diesel engine cylinder compression pressure can be caused by（）

  A . a leaking fuel injector nozzle B . a clogged air filter C . excessively early fuel injection D . malfunctioning valve

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• The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

  A . the cylinder head B . the cross-head C . the moving piston D . the stationary pisto

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• How are the pressure and temperature affected in a diesel engine cylinder during compression?（）

  A . Pressure and temperature decrease B . Pressure and temperature increase C . Pressure decreases and temperature increases D . Pressure increases and temperature decrease

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• You are using Recovery Manager (RMAN) to perform backups. In which three situations would you perform a compressed backup?（）

  A . You are backing up to tape and your tape device performs its own compression. B . You are making image copies, and you have not enabled tablespace compression. C . You are using disk-based backups and disk space in your Flash Recovery Area, or other disk-based backup destinations are limited. D . You are performing your backups to some device over a network where reduced network bandwidth is more important than CPU usage. E . You are using some archival backup media, such as CD or DVD, where reducing backup sizes saves media costs and archival storage.

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• A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）

  A . a leaking fuel injector nozzle B . a clogged air filter C . excessively early fuel injection D . malfunctioning valve

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• Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）

  A . increased horsepower B . reduced efficiency C . increased heat loss D . lower cylinder pressure

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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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• In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.

  A . evaporator B . compressor C . expansion valve D . condenser

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• Which of these tools should you use to compress VoIP packets on a low-speed Frame Replay circuit?（）

  A . Cisco Proprietary payload compression B . Predictor payload compression C . RTP header compression D . TCP header compressio

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• The latent heat of evaporation is dissipated in the （） in a compression refrigeration system.

  A . evaporator B . condenser C . expansion valve D . compressor

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

  A . worn or broken cylinder liner sealing rings B . high cooling water temperature C . worn or broken piston rings D . low fuel oil pressure

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• Americans live in a low contact society.

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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 piston

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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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• 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 rings

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