1) 2. During which stroke does the spark plug ignite the air-fuel mixture? a) a. Intake Stroke b) b. Compression Stroke c) c. Power Stroke d) d. Exhaust Stroke e) e. Valve Stroke 2) 5. If an engine's exhaust valve is stuck open during the intake stroke, what is the MOST likely result? a) a. The engine will overheat immediately. b) b. The compression ratio will become perfect. c) c. Unburned exhaust gases will dilute the fresh air-fuel mixture. d) d. The power stroke will become more powerful. e) e. The crankshaft will stop rotating. 3) 7. Considering the function of the camshaft described in the text, what would happen if the timing synchronization between the camshaft and crankshaft was off by a significant margin? a) a. The engine would not produce any power and might not run at all. b) b. The engine would run more quietly. c) c. The engine's fuel efficiency would drastically improve. d) d. The valves would open and close at the wrong times, disrupting the cycle. e) e. The spark plugs would stop working. 4) 4. Based on the text, what is the primary purpose of compressing the air-fuel mixture during the compression stroke? a) a. To clean the cylinder walls b) b. To slow down the engine speed c) c. To open the exhaust valve d) d. To increase its pressure and temperature e) e. To mix the oil with the fuel 5) 9. If a mechanic finds that an engine has low compression, which component's failure is MOST likely responsible based on the text's description of the compression stroke? a) a. The fuel injector b) b. The radiator c) c. The valves (not sealing properly) or piston rings d) d. The alternator e) e. The battery 6) 1. According to the text, what is the correct order of the four strokes in the engine cycle? a) a. Power, Exhaust, Intake, Compression b) b. Intake, Power, Compression, Exhaust c) c. Intake, Compression, Power, Exhaust d) d. Compression, Intake, Exhaust, Power e) e. Exhaust, Intake, Compression, Power 7) 6. The text explains that thermal efficiency is lost due to heat, exhaust, and friction. If an engineer develops a new, super-lubricant that eliminates all internal friction, what would be the likely outcome? a) a. The engine would achieve 100% thermal efficiency. b) b. The engine's thermal efficiency would improve but still be less than 100%. c) c. The engine would no longer need a cooling system. d) d. The four-stroke cycle would become a two-stroke cycle. e) e. The power output of the engine would decrease.

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