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【单选题】

Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）

A、during the valve overlap period

B、with only the exhaust valve open

C、at a pressure below atmospheric

D、without cooling the cylinders or pistons

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更多“Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）”相关的问题
第1题
[单选题] In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.

A、scavenging air ports；exhaust ports  B、inlet ports；scavenging air ports  C、scavenging air ports；inlet ports  D、exhaust ports；inlet ports  

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第2题
[单选题] In a diesel engine, an extremely leaking exhaust valve can cause （）.

A、misfiring  B、pre-ignition  C、interrupted scavenging  D、reduced scavenging  

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第3题
[单选题] Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）

A、Exhaust and scavenging  B、Scavenging and compression  C、Ignition and expansion  D、Exhaust and compression  

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第4题
[] （）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）

A、A.Inefficient scavenging；twice  B、B.Inefficient scavenging；1~8 times  C、C.Fewer strokes in a circle；twice  D、D.Fewer strokes in a circle；1~8 times  

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第5题
[单选题] （） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.

A、Diffusers  B、Compressors  C、Steam boilers  D、Soot blowers  

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第6题
[单选题] 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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第7题
[单选题] The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）

A、direction of air flow within the cylinder  B、sequence of port opening  C、method of opening exhaust ports  D、volume of air admitted to the cylinder  

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第8题
[单选题] In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?（）

A、Return-flow  B、Uniflow  C、Cross-flow  D、Direct flow  

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第9题
[单选题] （） of the A-frames there is a strong cast iron frame called the scavenging air box.

A、At the top  B、At the bottom  C、In the top  D、In the bottom  

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第10题
[单选题] （） is the removal of exhaust gases by blowing in fresh air.

A、Gas exchange  B、Charging  C、Scavenging  D、Supercharging  

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