A Cessna 172 has which type of powerplant?

The Cessna 172 is equipped with a reciprocating powerplant, which is a common engine design used in general aviation aircraft. Reciprocating engines operate on the principle of converting the linear motion of pistons—typically powered by a mixture of fuel and air—into rotational motion that propels the aircraft. The most commonly used engine in the Cessna 172 is a four-cylinder, horizontally opposed engine.

This type of engine is known for its reliability, simplicity, and ease of maintenance, making it an ideal choice for training and general purpose flying. Reciprocating engines can provide good performance at the relatively low altitudes and speeds typical of the Cessna 172's operational envelope, allowing for efficient flying characteristics and effective fuel consumption.

In contrast, turbine engines, which are found on many larger and faster aircraft, operate through a completely different principle by using flowing air and combustion to produce thrust, and are generally more complex and expensive to maintain. Turbo engines are a specific type of turbine engine designed to provide additional power at higher altitudes. The option mentioning mercury is not relevant to aviation powerplants and does not correspond to any recognized engine type used in Cessna aircraft.