Small Engine Performance, Maintenance, and Troubleshooting

Engines convert energy from burning fuel into ____ motion of the pistons.

• reciprocating
• rotary motion
• linear motion
• back and forth

The bore of an engine is the ____.

• length of the piston
• diameter of the cylinder
• volume of the cylinder
• depth of the cylinder

Top dead center is ____.

• lowest point of piston travel
• the center point of the cylinder bore, as measured at the top of the cylinder
• the highest point of piston travel
• the point the piston reaches balance

Bottom dead center is the ____.

• highest point of piston travel
• point the piston reaches balance
• center point of the cylinder bore, as measured at the bottom of the cylinder
• lowest point of piston travel

In a single-cylinder engine, displacement equals ____.

• the difference in volume above the piston when the piston is at BDC and at TDC
• one-half of the cylinder volume when the piston is at BDC
• the volume of the cylinder when the piston is at BDC divided by the volume of the cylinder when the piston is at TDC
• the volume above the piston when the piston is at TDC

In a single cylinder engine that has a 2 bore and a 4 stroke, the displacement is ____ cubic inches.

• 52
• 50.24
• 12.56
• 12.25

If an engine has multiple cylinders, the displacement is ____.

• the average of all cylinders displacement
• a single cylinder’s displacement divided by number of cylinders
• a single cylinder’s displacement multiplied by number of cylinders
• the sum of all cylinder’s displacement multiplied by the number of cylinders

Compression ratio is the ____.

• ratio of the volume above the piston when the piston is at BDC to the volume above the piston when the piston is at TDC
• ratio between the volume above the piston when the piston is at BDC and the average displacement
• the difference between the volume above the piston when the piston is at TDC and the volume when the piston is at BDC
• sum of the volumes above the piston when the piston is at BDC and at TDC

Force is ____.

• energy used to push or pull an object
• power
• horsepower
• amount of work an engine can do

Power is ____.

• energy used to push or pull an object
• work divided by the time required to accomplish it
• a measure of the maximum force of the engine
• amount of work an engine can do