Which engine type provides power with every revolution of the crankshaft?

• A. Rotary engine
• B. Electric motor
• C. Two cycle engine
• D. Four cycle engine

Answer: (C)

Power per crankshaft revolution depends on how the engine cycle is completed. In a two-stroke engine, the cycle of intake, compression, ignition, and exhaust is arranged so that a new power stroke happens with each turn of the crankshaft. That means every revolution delivers a burst of power. A four-stroke engine, on the other hand, needs two crankshaft revolutions to complete one full cycle, so power occurs only on every other revolution. The rotary engine operates under a different arrangement and isn’t tied to crankshaft revolutions in the same way, and an electric motor doesn’t use a crankshaft at all. So the two-stroke engine best fits the criterion of providing power with every revolution.