A piston is said to be at top dead center when it is （）

A、opening the exhaust ports

B、placed on top of the engine along its centerline

C、farthest from the cylinder head

D、nearest to the cylinder head

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更多“A piston is said to be at top dead center when it is （）”相关的问题

第1题

[单选题] A separate piston cooling system is used （） any contamination from piston cooling glands to the piston cooling system only.

A、to help B、to limit C、to protect D、to remove

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第2题

[单选题] As to the piston cooling, of the following, which statement is not true?（）

A、Because the piston is exposed to very high temperature, it must be cooled B、The lower the piston cooling temperature is, the better it is C、Both water and lube oil can be used as coolant D、One of the piston cooling methods is vibration cooling, with better effect

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第3题

[单选题] A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.

A、between；to B、either；or C、from；to D、neither；nor

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第4题

[单选题] The lower end of each piston rod is reduced in diameter to fit a bore in the （）, this being secured to the piston rod by a nut.

A、piston gudgeon pin B、piston skirt C、cross-head D、cross-head pin

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第5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6题

[单选题] The conclusion is（）the said ship is fit to continue to sail.

A、it B、this C、that D、what

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第7题

[单选题] The function of diesel engine piston compression rings is to （）.

A、prevent piston side thrust B、prevent engine friction losses C、transmit heat from the piston to the cylinder liner D、remove oil from the cylinder combustion space