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【单选题】

Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）

A、To allow for greater expansion due to higher operating temperature

B、To seal the cylinder against leakage of combustion gases

C、To provide an additional surface for oil cooling

D、To provide an additional strength for the crown and lower structure

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更多“Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）”相关的问题
第1题
[] In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）

A、A.is coming upward；cylinder ring belt  B、B.is going downward；piston ring belt  C、C.is coming upward；piston ring belt  D、D.is going downward；cylinder ring belt  

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第2题
[单选题] In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.

A、piston crown  B、piston ring groove  C、piston skirt  D、piston ring area  

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第3题
[单选题] In some designs the cylinder oil is timed so that the oil injects only on the （）.

A、piston crown  B、piston groove  C、piston skirt  D、piston ring belt  

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第4题
[单选题] In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）

A、compression stroke  B、suction stroke  C、expansion stroke  D、exhaust stroke  

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第5题
[单选题] The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

A、sea water  B、scavenging air  C、lubricating oil  D、fuel oil  

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第6题
[单选题] The belt of light and variable winds between the westerly wind belt and the northeast trade winds is called the（）.

A、subtropical high pressure belt  B、intertropical convergence zone  C、doldrum belt  D、polar frontal zone  

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第7题
[单选题] Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）

A、faulty combustion  B、excessive ring temperature  C、over lubrication  D、all of the above  

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第8题
[单选题] The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.

A、a continuous ringing for 10 seconds  B、one short ring followed by one long ring  C、two long rings of at least 20 seconds  D、a continuous ringing until the fire is extinguished  

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第9题
[单选题] The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.

A、a continuous ringing for 10 seconds  B、one short ring followed by one long ring  C、two long rings of at least 20 seconds  D、a continuous ringing until the fire is extinguished  

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