a type of engine that processes air and fuel by a back and forth movement of its internal parts.

a type of engine that processes air and fuel by a back and forth movement of its internal parts.

• A. Cycle
• B. Reciprocating
• C. Magneto
• D. Fuel

Answer: (B)

Reciprocating engines use pistons that move back and forth inside cylinders to process air and fuel. This linear motion lets the piston draw in the air-fuel mixture, compress it, ignite it, and then push back to expend the expanding gases, converting chemical energy into mechanical work. That back-and-forth, or reciprocating, motion is the defining feature of this engine type. The other terms aren’t engine types: a cycle describes a thermodynamic sequence (like the Otto or Diesel cycle), a magneto is an ignition device, and fuel is the energy source, not the engine mechanism.

Reciprocating engines use pistons that move back and forth inside cylinders to process air and fuel. This linear motion lets the piston draw in the air-fuel mixture, compress it, ignite it, and then push back to expend the expanding gases, converting chemical energy into mechanical work. That back-and-forth, or reciprocating, motion is the defining feature of this engine type. The other terms aren’t engine types: a cycle describes a thermodynamic sequence (like the Otto or Diesel cycle), a magneto is an ignition device, and fuel is the energy source, not the engine mechanism.