What is one characteristic of rotary engines?

• A. They have multiple cylinders.
• B. They rely on reciprocating motion.
• C. They feature a triangular rotor.
• D. They are used in most passenger cars.

Answer: (C)

Rotary engines are characterized by their unique design, which features a triangular rotor. This rotor moves in an elliptical pattern within a chamber, allowing for continuous combustion and exhaust processes. The triangular shape of the rotor is what distinguishes rotary engines from more conventional designs that utilize straight cylinders and reciprocating pistons. This construction leads to a compact engine with fewer moving parts, which can result in lighter weight and potentially higher power output relative to engine size.

The other characteristics mentioned do not apply to rotary engines. While some engines may have multiple cylinders, rotary engines generally do not follow this cylinder format. Instead of relying on reciprocating motion, which involves pistons moving back and forth, rotary engines convert pressure into rotary motion. Additionally, most passenger cars predominantly use piston engines rather than rotary engines due to different operational characteristics and market preferences.