What type of engine uses spark plugs for ignition?

• A. Electric engines
• B. Diesel engines
• C. Gasoline engines
• D. Rotary engines

Answer: (C)

Gasoline engines utilize spark plugs for ignition, which is a fundamental aspect of their operation. In these engines, a mixture of air and fuel is drawn into the combustion chamber, and when the piston is near the top of its cycle, the spark plug generates a spark. This spark ignites the air-fuel mixture, creating an explosion that pushes the piston down, producing power.

The design and function of spark plugs is specific to gasoline engines, as they require a reliable source of ignition to maintain the engine's operation efficiently. This is in contrast to diesel engines, which do not use spark plugs; instead, they rely on the heat of compression to ignite the fuel. Electric engines function on a completely different principle, using electrical energy to drive motors rather than combustion. Rotary engines also have unique ignition systems that do not primarily rely on traditional spark plugs in the same manner as conventional gasoline engines. Thus, the use of spark plugs is a distinct characteristic of gasoline engines, confirming their pivotal role in this type of engine.