Question

technician a says that the compression stroke is also called the expansion stroke. technician b says that the compression ratio compares the cylinder volume at bdc to tdc. who is correct? select one: a. technician a b. technician b c. both a and b d. neither a nor b

Explanation:

• Technician A: The compression stroke is not the expansion stroke. The expansion stroke is the power stroke where the fuel - air mixture burns and expands.
• Technician B: Compression ratio \(r=\frac{V_{BDC}}{V_{TDC}}\), where \(V_{BDC}\) is the cylinder volume at Bottom Dead Center (BDC) and \(V_{TDC}\) is the cylinder volume at Top Dead Center (TDC).

Answer:

B. Technician B