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【单选题】

The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）

A、TBO

B、CEO

C、CFO

D、MCR

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更多“The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）”相关的问题
第1题
[单选题] The clearance volume for a single stage compressor is defined as the space created between the （）.

A、top of the piston and bottom side of head, with the piston at BDC  B、piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDC  C、bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placement  D、top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC  

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第2题
[单选题] A diesel engine piston ring face is in direct contact with the （）.

A、top of the ring groove  B、cylinder liner oil film  C、bottom of the ring groove  D、back of the ring groove  

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第3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4题
[] In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）

A、A.top of the ring groove  B、B.back of the ring groove  C、C.bottom of the ring groove  D、D.piston ring end clearance  

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第5题
[单选题] Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

A、Control the amount of lube oil burned in the combustion chamber  B、Transmit heat from the piston to the cylinder liner  C、Prevent damage to ring groove inserts by acting as a heat dam  D、Dissipate combustion chamber gas pressure by channeling it through the ring gap  

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第6题
[单选题] Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）

A、jam in the most worn part of the cylinder when the rings expand  B、break in the most worn part of the cylinder when the rings expand  C、wear eccentrically on the side opposite the end gap  D、overheat and jam at the top center on the combustion stroke  

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第7题
[单选题] Among the rings of a piston the （） one is subjected to the greatest load and temperature.

A、bottom  B、middle  C、top  D、none of the above  

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第8题
[单选题] All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

A、the running-in period  B、the running process  C、gas exchange process  D、the boiler firing  

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第9题
[单选题] In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）

A、wide compression rings are used  B、oil rings are located above the piston  C、chromium plating is used on all piston rings  D、oil rings are located near the bottom of the piston skirt  

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第10题
[] In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）

A、A.Used of bimetallic piston rings  B、B.Ring gap pre-tensioning  C、C.Thermal increase in ring-end clearance  D、D.Gas pressure acting against the back of the ring  

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