Broken piston rings manifest themselves during the scavenge port inspection by（）

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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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• 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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• 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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• 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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• In a diesel engine, when installing new piston rings it is important to check（） Ⅰ.ring gap clearance Ⅱ.side clearance

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

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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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• These piston rings are so badly worn that they must be （）.

  A . renewed B . welded C . machined D . chromium-plated

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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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• Improperly fitted piston rings in a diesel engine can cause（）

  A . excessive lube oil consumption B . lower than normal lube oil temperature C . higher than normal exhaust back pressure D . excessive crankshaft end play

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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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• Ring groove inserts are occasionally used on aluminum alloy piston to（）

  A . reduce the ring groove wear rate B . seal against crankcase vapors C . lessen the wear on aluminum part of the cylinder D . allow for the greater expansion rate of aluminum

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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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• Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）

  A . jam in the most worn part of the cylinder when the rings expand B . break in the most worn part of the cylinder when the rings expand C . wear eccentrically on the side opposite the end gap D . overheat and jam at the top center on the combustion stroke

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• If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

  A . excessive ring action B . excessive ring temperature C . improper ring rotation D . excessive ring face wear

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• The piston rings if found worn out （） and supplied by shipchandler.

  A . must replace B . must to be equipped C . has to be repaired D . have to be renewed

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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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• 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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