The airplane engine has four cycles: intake, compression, power, and exhaust.

The airplane engine has four cycles: intake, compression, power, and exhaust.

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

Answer: (A)

This is testing the idea of a sequence of events in an engine operation—the cycle. In a four-stroke airplane engine, one complete cycle includes intake, compression, power, and exhaust. Each full cycle repeats as the crankshaft turns, driving the piston through those stages again and again. Why this is the best fit: the word cycle names the entire sequence of steps the engine goes through in one operation. The other terms refer to something else: reciprocating describes the back-and-forth motion of the piston, magneto is an ignition device, and fuel is the substance burned. None of those names the sequence itself, which is why cycle is the correct choice.

This is testing the idea of a sequence of events in an engine operation—the cycle. In a four-stroke airplane engine, one complete cycle includes intake, compression, power, and exhaust. Each full cycle repeats as the crankshaft turns, driving the piston through those stages again and again.

Why this is the best fit: the word cycle names the entire sequence of steps the engine goes through in one operation. The other terms refer to something else: reciprocating describes the back-and-forth motion of the piston, magneto is an ignition device, and fuel is the substance burned. None of those names the sequence itself, which is why cycle is the correct choice.