搜题

【单选题】

Ring groove inserts are occasionally used on aluminum alloy piston to（）

A、reduce the ring groove wear rate

B、seal against crankcase vapors

C、lessen the wear on aluminum part of the cylinder

D、allow for the greater expansion rate of aluminum

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更多“Ring groove inserts are occasionally used on aluminum alloy piston to（）”相关的问题

第1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

[] If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

A、A.excessive ring action B、B.excessive ring temperature C、C.improper ring rotation D、D.excessive ring face wear

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第4题

[单选题] A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）

A、gap B、side C、back D、radial

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第5题

[] In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove

A、A.Ⅰ only B、B.Ⅱ only C、C.both Ⅰ and Ⅱ D、D.neither Ⅰ nor Ⅱ

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第6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7题

[单选题] A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（） Ⅰ.gap Ⅱ.side

A、Ⅰonly B、Ⅱ only C、both Ⅰ and Ⅱ D、neither Ⅰ nor Ⅱ

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第8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9题

[单选题] The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.

A、upwards；inwards B、upwards；outwards C、downwards；inwards D、downwards；outwards

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