A number of cylinder liners are enclosed in one cast iron casing to form a （）.

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• In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.

  A . scavenging air ports；exhaust ports B . inlet ports；scavenging air ports C . scavenging air ports；inlet ports D . exhaust ports；inlet port

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• The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）

  A . dry liner B . wet liner C . jacket liner D . corrugated liner

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• The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）

  A . Low compression pressure and high exhaust temperature B . Low firing pressure and high exhaust temperature C . Low compression pressure and low exhaust temperature D . Low firing pressure and low exhaust temperature

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• Which of the listed cylinder liner surface conditions indicates proper lubrication?（）

  A . Dull black appearance B . Bright appearance C . Thin layer of lacquer D . Thick oily film

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• A single piece（） fitted with bronze rings guides the piston in the cylinder liner.

  A . piston skirt B . piston crown C . guide way D . cross-head

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• It is easier to replace a dry cylinder liner than a wet one because（）

  A . of the thin wall thickness B . honing makes it easier to maintain the desired oil ilm C . water seals are not required D . it fits more loosely due to a decrease in heat transfer through the composite wall

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• In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

  A . Differential B . Trunk C . Barrel D . Valve-in-head

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• Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）

  A . twice as large as with a cast iron piston B . the same size as with a cast iron piston C . half as large as with a cast iron piston D . the same size as the crown of an aluminum pisto

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

  A . brake horsepower B . displacement C . cylinder volume D . cylinder clearance

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• Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.

  A . low compression pressure B . increased piston wear C . increased cylinder lube oil consumption D . poor contact between compression rings and liner

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• The cylinder head, cylinder liner and （） form the combustion chamber.

  A . frame B . piston C . crankcase D . explosion plate

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• Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）

  A . amount of scavenge air to the cylinder B . quality of fuel injected C . viscosity of the lube oil D . compression ratio of the pisto

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• In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . neither (1) or (2) axe correct

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• The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.

  A . around B . among C . in D . betwee

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• The rate of wear on a cylinder liner depends on the （）

  A . quality of air filtration B . effectiveness of lubrication C . type of fuel used D . all of the above

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• In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

  A . additives B . water C . grease D . acid solutio

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• The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.

  A . screwing into B . being screw on C . to screw on D . screwed into

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• Which of the following statements concerning cylinder liner wear is true?（）

  A . Liner wear is distributed equally between the upper and lower portions of the cylinder B . Excessive liner wear causes wear between piston ring and groove C . Excessive, but uniform liner wear will not cause wear between piston ring and groove D . Liner wear is normally greatest in the middle of the cylinder

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• One advantage of dry cylinder liners used in a diesel engine is the（）

  A . lower thermal expansion rates than wet liners B . greater heat transfer rate than wet liners C . greater wear resistance than wet liners D . procedure to replace dry liners is simpler than for wet liner

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• Scuffed cylinder liner surfaces in a diesel engine can result form（）

  A . starting the engine hot B . knurling the piston skirt C . operating an overheated engine D . using scuff resistant piston ring

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• Because of the resulting higher pressures in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made （） at the top to accommodate the higher stresses, and prevent cracking of the material.

  A . thinner B . thicker C . smoother D . rougher

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• In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ and Ⅱ

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• The cylinder covers and the liners are bolted together by means of （）.

  A . bolts welded into the cylinder head B . bolts welded into the cylinder frames C . studs screwed into the cylinder head D . studs screwed into the cylinder frame

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• One advantage of dry cylinder liners used in a diesel engine is the_________.

  A.lower thermal expansion rates than wet liners B.greater heat transfer rate than wet liners C.greater wear resistance than wet liners D.procedure to replace dry liners is simpler than for wet liners

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