搜题

【单选题】

Each piston stuffing box is provided with two sealing rings and three（）

A、packings

B、piston rings

C、distributor rings

D、scraper rings

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更多“Each piston stuffing box is provided with two sealing rings and three（）”相关的问题

第1题

[单选题] An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned （）.

A、radially from the shaft B、parallel to each other and to the shaft C、parallel to each other but at a right angle to the shaft D、at an angle to each other and to the shaft

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第2题

[单选题] The sealing rings are in four parts and pressed together around the piston rods by means of （）.

A、nuts B、bolts C、coil springs D、stuffing boxes

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第3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4题

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

A、a bolt B、a cap C、a disc D、a nut

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第5题

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

A、the crank-web B、the connecting rod C、the main bearing D、the cross-head

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第6题

[单选题] Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.

A、accelerates；decelerates B、accelerates；accelerates C、decelerates；decelerates D、decelerates；accelerates

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第7题

[单选题] The packing installed in the pump stuffing box is lubricated by （）.

A、gravity and feed oil cups B、grease cups C、hand during installation D、leakage through the stuffing box

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第8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9题

[单选题] Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.

A、cylinder liner B、coupling flange C、cylinder cover D、piston crown

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