4-9. During what stroke in the operatingcycle of a 4-stroke Otto-cycleengine is the greatest forceexerted on the piston head?1. Intake2. Compression3. Power4. Exhaust4-10.Which of the following eventsoccurs during the exhaust stroke ina 4-stroke Otto-cycle engine?1.Fuel-,air-mixture is ignited2.Temperature and pressure ofmixture increases3.A partial vacuum is created4.Burnt gasses are cleared from4–13.Which, if any, of the followingcomponents determine(s) theposition of the valves?1.The pistons2.The camshaft3.The crankshaft4.None of the above4-14.The ignition system is timed sothat the spark occurs before thepiston reaches TDC on which of thefollowing strokes?1.Exhaust2.Intake3.Power4.Compressionthe cylinder4-15.Which of the following engine4-11.The basic difference between the2-stroke–cycle and the4-stroke-cycle diesel engine is inthe1.number of pistons2.piston arrangement3.number of piston strokes during4–16.a cycle of events4.distance is piston travelsduring a stroke4-12.How many crankshaft revolutions arerequired for each power stroke in a(a) 4-cycle engine and (b) 2-cycleengine?1.(a) Two (b) one2. (a) Four (b) two3.(a) One(b) two4.(a) Two (b)) fourclassification methods is the mostcommon?1.Type of fuel used2.Cylinder arrangement3.Valve arrangement4.Type of cooling usedCombustion takes place as a resultof ignition by what in a (a) dieselengine and (b) gasoline engine?1.(a) Expansion of compressedgases(b) a Spark2.(a) Heat of compression(b) a spark3.(a) A spark(b) heat of compression4.(a) A spark(b) expansion of compressedgases34
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