The crankpins and journals were machined and matching holes bored in the webs, which were slightly （） in diameter...

第1题

[] The （） of the semi-built method of the construction crankshaft is that by making the two webs and crankpin from a single forging the grain flow in the steel follows the web round into the crankpin and back down the other web.

A、A.advantages B、B.disadvantages C、C.power advantages D、D.power disadvantages

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第2题

[单选题] One method of determining crankshaft misalignment is by（）

A、laying a straight edge across the crank webs at the crankpin and measuring the distance to the crankpin in two places B、measuring the crank drop on either side of each crank throw while the crankshaft is slowly rotated through one revolution C、rotating the crankshaft through one revolution, pausing each 90oof rotation to measure bearing clearances, top and bottom D、taking micrometer reading between the crank cheeks opposite the crankpin every 90°of crank angle rotation

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第3题

[单选题] Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

A、cylinder liners and piston rings B、main bearings C、crankpin bearings D、turboblower

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第4题

[单选题] Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.

A、the piston cooling oil return pipes B、the main and crankpin bearings C、thrust and intermediate bearings D、stern tube and thrust bearings

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第5题

[单选题] In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）

A、build up the piston crown by metal spraying B、build up the cylinder head by metal spraying C、insert shims between the crankpin bearing box and the connecting rod foot D、install a thinner head gasket

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第6题

[单选题] In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

A、crosshead B、crankpin C、crank journal D、gudgeon pin

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第7题

[单选题] The small end of the connecting rod is attached to the piston with a （）.

A、crankpin B、sliding wedge C、wrist pin D、torque bashing

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第8题

[单选题] The diameters of the crankpins should be measured using （）.

A、a micrometer B、a bridge gauge C、a spanner D、a wrench

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第9题

[判断题] 设计观测系统前，应确定可以追踪目的波的区段，为此，要在足够长的排列上测定目的波与干扰波的相对强度“JO”，当JO＞1.5～2的地段是最有利的，这时用简单的观测系统就可以连续追踪所有的目的波；当JO＜1.5～2的地段，只有采用多次覆盖方法才有可能识别目的波。

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The crankpins and journals were machined and matching holes bored in the webs, which were slightly （） in diameter.

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