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【单选题】

The rate of pressure rise during the period following fuel ignition in a diesel will result in （）

A、valve overlap

B、volumetric efficiency

C、turbulence of the air change

D、fuel efficiency

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第1题
[单选题] The rate of fuel injection in a diesel engine cylinder depends primarily on （）.

A、the size of the holes in the fuel nozzle  B、timing of the pump  C、supply pressure to the pump  D、shape of the combustion chamber  

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第2题
[单选题] Because of the reduced （） in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.

A、temperature  B、water level  C、pressure  D、rate of flow  

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第3题
[单选题] The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.

A、pressure differences in the atmosphere  B、the length of the hose attached to the facepiece  C、the physical exertion of the person wearing the device  D、spaces containing poisonous vapors  

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第4题
[单选题] The primary duty of lube oil is to reduce （） between the working parts of an engine.

A、power output  B、friction and wear  C、indicated pressure  D、rated horsepower  

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第5题
[单选题] The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

A、temperature  B、pumping rate  C、pressure  D、heat  

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第6题
[单选题] Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）

A、the lubricating oil consumption  B、the turbine blade temperature  C、the flow rate of fuel  D、scavenge air pressure  

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第7题
[单选题] 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 pressures  

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第8题
[] In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.

A、A.evaporator  B、B.compressor  C、C.condenser  D、D.none of the above  

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第9题
[单选题] The cetane rating of diesel fuel is an indication of the（）

A、ignition quality of the fuel  B、calorific value of the fuel  C、flash point of the fuel  D、rate of fuel consumption  

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