(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）

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• The lower section of a piston is called the （）.

  A . land B . skirt C . crown D . plate

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• 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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• Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）

  A . Stationary B . Full floating C . Semi-floating D . Free rolling

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• Excessive piston ring wear in a diesel engine will cause（）

  A . high lube oil viscosity B . increased lube oil consumption C . low lube oil temperatures D . high firing pressure

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• In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall

  A . Ⅰ only B . Ⅱ only C . either Ⅰ or Ⅱ D . neither Ⅰ or Ⅱ

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• 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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• The piston ring grooves for a standard engine are （）

  A . chromium-plate against wear B . anti-corrosion treated C . white metal lined against wear D . flame hardened against wear

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• 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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• 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 pi

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• The four-stroke cycle begins with the piston （）.

  A . coming up from the BDC B . coming up from the TDC C . coming down from the BDC D . coming down from the TDC

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• Piston cooling fins are located（）

  A . atop the piston crown B . beneath the piston crown C . at the base of the piston skirt D . inside the cylinder liner cooling water jacket

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• The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

  A . so a height B . such a height C . so high D . such high

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• The upper section of a piston is called the （）

  A . land B . skirt C . crown D . plate

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• The piston supporting body is mainly subjected to （） stress.

  A . pushing B . centrifugal C . stretch D . compressive

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• A diesel engine piston crown can crack from （）

  A . excessive piston to liner clearance B . excessive dirt beneath the piston crown that reduces heat transfer C . faulty nozzle spray D . all of the above

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• When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）

  A . insufficient lubrication B . improper piston cooling C . blow-by D . overload operatio

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• The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.

  A . the same piston B . the piston nearby C . the other pistons D . the generators on board

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• The main function of piston compression rings is to （）

  A . prevent excessive cylinder liner wear B . reduce friction losses in the engine C . seal the space between the piston and the liner D . limit upward flow of lube oil into the combustion space

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• 英语PISTON指（）

  A . A、活塞 B . B、开关 C . C、按钮 D . D、弹簧

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• 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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• During the suction stroke, the piston is moving （）.

  A . inwards B . outwards C . downwards D . upward

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• If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）

  A . alternation of side thrust B . a breakdown of the lube oil film on the cylinder wall C . worn piston boss piston pin bearings D . fluctuating gas pressure in the combustion space

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• The lowest ring of a piston is （）.

  A . a coil spring B . a sealing ring C . an oil distributor ring D . main seal ring

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• Black areas on the sealing surfaces of piston rings indicate＿.

  A.lube oil pumping B.rotating rings C.gas pressure behind the ring D.passage of hot gases

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