Small-Engine Basics Practice

1. What should identify the correct maintenance parts for a small engine?

A. Its model information and manualB. Equipment paint colorC. Fuel-cap diameter aloneD. Any part with a similar picture

2. What does the air filter protect against?

A. Rain entering the tiresB. Overcharging the batteryC. Excessive trailer tongue loadD. Dirt entering the engine

3. Should every foam and paper air filter be serviced the same way?

A. Yes, wash every filter with gasolineB. Yes, remove every filter permanentlyC. No, follow the filter-specific instructionsD. Yes, soak every filter in oil

4. What does a carburetor do?

A. Measure blade torqueB. Mix fuel and air for combustionC. Store electrical energyD. Adjust tire tread

5. What does a choke normally do for cold starting?

A. Enrich the mixture by restricting intake airB. Drain the crankcaseC. Disconnect the flywheelD. Open the exhaust valve permanently

6. What should normally happen to a manual choke as the engine warms?

A. Keep it fully closed indefinitelyB. Use it to regulate tire pressureC. Remove it from the carburetorD. Move toward the normal running position as instructed

7. What is the main function of a spark plug in a gasoline small engine?

A. Pump fuel from the tankB. Cool the flywheelC. Initiate ignition with a sparkD. Filter engine oil

8. How should you determine spark-plug gap?

A. Match the fuel hose diameterB. Use the engine specification and correct measuring toolC. Use one universal gap for every engineD. Guess from the old plug's color

9. What can degraded fuel cause?

A. Starting and running problemsB. A guaranteed increase in horsepowerC. Permanent elimination of depositsD. Automatic valve adjustment

10. What should guide fuel-stabilizer use?

A. Double the amount every weekB. Use it instead of engine oilC. Mix it with brake fluidD. Product directions and the engine's storage guidance

11. What does a governor generally regulate?

A. Spark-plug thread diameterB. Fuel container capacityC. Engine operating speed under changing loadD. Wheel alignment

12. What should you do with a governor if the engine seems slow?

A. Remove the spring without checkingB. Diagnose using the manual rather than bypassing itC. Disable it to gain RPMD. Tie it at full throttle

13. What is the crankcase oil's role in a typical four-stroke engine?

A. Lubricate internal moving partsB. Replace all gasolineC. Inflate the cooling fanD. Regulate the tire valves

14. Where do many premix two-stroke engines get lubrication?

A. Plain gasoline aloneB. Radiator coolantC. Brake fluidD. Oil mixed with fuel at the specified ratio

15. What should you do if you are unsure whether an engine requires premix?

A. Add an arbitrary amount of oilB. Choose based on exhaust color aloneC. Check its manual before fuelingD. Assume all engines use plain gasoline

16. What do cooling fins help do on an air-cooled engine?

A. Control battery voltageB. Transfer engine heat to the airC. Store fuelD. Measure compression

17. What should happen before working near a mower blade?

A. Stop and isolate the equipment as directedB. Leave it idlingC. Rely only on the throttle being lowD. Ask someone to hold the blade

18. When should a gasoline-powered engine be refueled?

A. While runningB. Over a hot exhaust pipeC. Beside an open flameD. After shutdown and cooling as specified, away from ignition sources

19. Where should a portable combustion generator run?

A. Inside a basement near a fanB. In an attached porch enclosureC. Outdoors away from building openings according to safety guidanceD. Inside a garage with one window open

20. What should you do before restarting equipment after service?

A. Start it at maximum speed immediatelyB. Check correct reassembly, guards and safe operationC. Remove guards to watch moving partsD. Ignore loose fasteners

Small-Engine Basics Practice

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