A ___ _____ ______ provides power with each revolution of the crankshaft.

• A. Four stroke engine
• B. Two cycle engine
• C. Diesel engine
• D. Gas turbine

Answer: (B)

The thing being tested is how often a power stroke occurs relative to crankshaft rotation. In a two-stroke engine, the full cycle—intake, compression, power, and exhaust—finishes in one revolution of the crankshaft, so a power stroke happens with every turn. That means power is produced on each revolution. In contrast, a four-stroke engine needs two crankshaft revolutions to complete the cycle, so the power stroke occurs only every other revolution. Diesel engines are usually four-stroke, and gas turbines don’t use a crankshaft-based cycle in the same way. So the option that yields power with every crankshaft revolution is the two-stroke engine.