The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin.

相似题目

• 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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• The function of the piston compression rings used in a diesel engine is to （）

  A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

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• If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

  A . backfire through the air intakes B . develop less power under load C . have high firing pressures D . lift its cylinder relief valve

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• A diesel engine piston ring face is in direct contact with the （）.

  A . top of the ring groove B . cylinder liner oil film C . bottom of the ring groove D . back of the ring groove

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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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• Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

  A . In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B . Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C . No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D . The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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

  A . packings B . piston rings C . distributor rings D . scraper ring

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• 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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• If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）

  A . The oil control rings will seal improperly and wear rapidly B . The piston will overheat due to insufficient lubrication C . Excessive oil will remain on the cylinder wall D . Light brown smoke will emanate from the engine exhaust

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• The main purpose of the piston oil scraper rings is to （）.

  A . seal the space between the piston and the liner B . reduce the amount of lube oil burned in the combustion chamber C . transmit heat from the piston to the cylinder liner D . damp out fluctuations of the piston side thrust

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• A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（） Ⅰ.gap Ⅱ.side

  A . Ⅰonly B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ nor Ⅱ

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• The primary purpose of oil control rings on a diesel piston is to（）

  A . provide a reservoir for cylinder lubrication B . pump oil into the combustion space for cylinder cooling C . prevent excessive lubricating oil consumption D . allow hydraulic oil film formation on the cylinder

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• 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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• 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；outward

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• When installing rings on a diesel engine piston, you should check the ring（）

  A . diametrical tension B . gap clearance C . radial thickness D . face thickne

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• Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

  A . Control the amount of lube oil burned in the combustion chamber B . Transmit heat from the piston to the cylinder liner C . Prevent damage to ring groove inserts by acting as a heat dam D . Dissipate combustion chamber gas pressure by channeling it through the ring ga

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• The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices during （）

  A . the upward stroke B . the downward stroke C . the power stroke D . the suction stroke

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• In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）

  A . compression stroke B . suction stroke C . expansion stroke D . exhaust stroke

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• If the piston ring gap remains insufficient when installing new rings, youshould（）

  A . install oversized rings B . hone the cylinder liner to allow ring installation C . compress the rings tighter with a compressing tool D . file the ends of the ring

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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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• Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）

  A . back B . side C . gap D . bottom

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• Among the rings of a piston the （） one is subjected to the greatest load and temperature.

  A . bottom B . middle C . top D . none of the above

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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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• The cylinder oil is pumped into the cylinder （via non-return valves) when the piston rings

  The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during ______. A.the upward stroke B.the downward stroke C.the power stroke D.the suction stroke

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