Bottom of piston travel called?

Bottom of piston travel called?

• A. Bottom dead center (BDC)
• B. Mid-stroke
• C. Top dead center (TDC)
• D. Crank angle

Answer: (A)

Piston extremes in a cylinder are called Top Dead Center and Bottom Dead Center. The bottom of the piston's travel is Bottom Dead Center—the lowest point in its motion, where the piston is farthest from the cylinder head and the cylinder volume is at its maximum. As the crankshaft turns, the piston rises to the top at Top Dead Center and then falls back to Bottom Dead Center to complete a stroke. Mid-stroke is simply halfway between these two extremes, not a final resting point, and crank angle is a measurement of how far the crank has rotated in degrees, not a fixed piston position.

Piston extremes in a cylinder are called Top Dead Center and Bottom Dead Center. The bottom of the piston's travel is Bottom Dead Center—the lowest point in its motion, where the piston is farthest from the cylinder head and the cylinder volume is at its maximum. As the crankshaft turns, the piston rises to the top at Top Dead Center and then falls back to Bottom Dead Center to complete a stroke. Mid-stroke is simply halfway between these two extremes, not a final resting point, and crank angle is a measurement of how far the crank has rotated in degrees, not a fixed piston position.