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【单选题】

The piston rings are manufactured with a diameter （） the bore of the cylinder.

A、larger than

B、smaller than

C、equal to

D、none of the above

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更多“The piston rings are manufactured with a diameter （） the bore of the cylinder.”相关的问题
第1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] Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

A、cylinder valves  B、compression rings  C、piston skirts  D、oil rings  

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第4题
[单选题] Broken piston rings manifest themselves during the scavenge port inspection by（）

A、Lack of elastic tension, when the rings are pressed into the groove by means of a stick  B、Blackish appearance  C、Fractured rings and missing rings  D、all off the above  

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第5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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第6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7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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第8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9题
[单选题] If the back clearance of a piston ring is excessive,（）

A、compression pressure in the cylinder will be higher  B、carbon will accumulate behind the ring  C、combustion gases will penetrate beneath the ring land  D、piston side thrust will be increased  

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第10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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