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Engine ReviewMultiple ChoiceIdentify the choice that best completes the statement or answers the question.____1.The most common type of cam drive on cam-in-block engines is the timing ____.a.beltc.reducerb.chaind.gear____2.The ____ is a heavy wheel mounted on a rubber ring and keyed to the crankshaft snout.a.dynamic tunerc.harmonic balancerb.oscillation damperd.vibration snubber____3.Technician A says that timing marks are not necessary when a timing belt is used. Technician B says that timing marks are unnecessary only with timing gears. Who is right?a.A only.c.Both A and B.b.B only.d.Neither A nor B.____4.Which of the items below is a measurement of the usable horsepower at the engine crankshaft?a.Indicated horsepower. horsepower.c.Brake horsepower.d.Gross horsepower.____5.After subtracting various losses to friction, exhaust, etc., what percent of the fuel’s heat energy is left to do useful work?a.16c.35b.20d.47____6.For safety, bolts used to secure a lifting chain to the engine must thread into the hole for a distance that is ____ their thread diameter.a.halfc.1 1/2 timesb.equal tod.twice____7.A ridge of metal left at the top of a cylinder due to wear of the area below is called a ____ ridge.a. endb.ringd.pistonTrue/FalseIndicate whether the statement is true or false.____8.The crankshaft pulley operates belts to turn the alternator and water pump.____9.A timing belt cover is different from an engine front cover.____10.The cogged teeth on a timing belt prevent slippage.____11.An oil slinger uses centrifugal force to lubricate the engine’s timing chain.____12.To take up slack in a timing chain, a tensioner is used.____13.A crank sprocket is usually mounted on the camshaft.____14.The primary purpose of the engine front cover is to prevent oil leakage out the front of the engine.____15.Thermal efficiency generally ranges from 20-30%.____16.Cylinder bore is measured from top to bottom.____17.Engine displacement is stated in TDC (Total Displacement Cubic).____18.Gasoline engine compression pressures are typically higher than those of diesel engines.____19.Work = distance moved ? elapsed time.____20.The prony brake was the forerunner of today's antilock braking systems.____21.Approximately 20 to 30 percent of an engine's power is lost to friction.____22.If an engine is old, the freeze plugs should be pried out and new ones installed before reassembly.____23.Before removal, hood hinges should be marked for proper alignment when reinstalled.____24.A sharp, narrow scraper should be used to remove carbon from piston ring grooves.____25.Only cast iron or steel parts should be soaked in a hot tank. Aluminum parts will corrode or be etched.____26.When lifting an engine out of a vehicle, care should be taken to select lift points that will raise the engine in a level manner.____27.Generally, power steering and air conditioning lines should be disconnected before removing the engine.____28.You should never work on an engine while it is suspended from a crane or hoist.Short Answer29.What is the purpose of the tensioner used with a timing chain?30.In a set of timing gears, the cam gear is twice the size of the crank gear. What effect does this have on the speed of the camshaft?31.What feature of a timing belt ensures smooth, accurate transmission of power without slippage?32.If signs of leakage are noted when manifolds or cylinder heads are removed, what should be done?33.What is the most important safety rule when lifting an engine out of a vehicle?MatchingMatch the following terms and identifying phrases.a.volumetric efficiencyb.mechanical efficiencyc.thermal efficiency____pares brake hp and indicated hp.____35.Ratio of air actually drawn into cylinder to maximum possible air that could enter.____36.Found by comparing fuel burned with horsepower output.Engine ReviewAnswer SectionMULTIPLE CHOICE1.ANS:BPTS:12.ANS:CPTS:13.ANS:DPTS:14.ANS:CPTS:15.ANS:BPTS:16.ANS:CPTS:17.ANS:BPTS:1TRUE/FALSE8.ANS:TPTS:19.ANS:TPTS:110.ANS:TPTS:111.ANS:TPTS:112.ANS:TPTS:113.ANS:FPTS:114.ANS:TPTS:115.ANS:TPTS:116.ANS:FPTS:117.ANS:FPTS:118.ANS:FPTS:119.ANS:FPTS:120.ANS:FPTS:121.ANS:TPTS:122.ANS:TPTS:123.ANS:TPTS:124.ANS:FPTS:125.ANS:TPTS:126.ANS:TPTS:127.ANS:FPTS:128.ANS:TPTS:1SHORT ANSWER29.ANS:To take up slack as the chain and sprockets wear.PTS:130.ANS:It rotates at half the speed of the crankshaft.PTS:131.ANS:It has cogged (square) teeth that mesh with the sprocket teeth.PTS:132.ANS:Use a straightedge to check for warping. If necessary, mating surfaces should be machined flat.PTS:133.ANS:Never place any part of your body under an engine that is held in the air.PTS:1MATCHING34.ANS:BPTS:135.ANS:APTS:136.ANS:CPTS:1 ................
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