Solve this multiple-choice question and choose the correct option.

Jet propulsion: What did Frank Whittle invent and pioneer in modern aviation? Context: 1930s patents and the first British turbojet engine leading to the Gloster E.28/39 test flight (1941). Choose the correct invention.

Difficulty: Easy

The turbojet engine
The afterburner
The variable-sweep wing
The turbofan engine

Correct Answer: The turbojet engine

Explanation:

Given data

Name Frank Whittle’s principal invention.

Concept / ApproachSir Frank Whittle patented and developed the turbojet, culminating in the Gloster E.28/39's first flight in 1941.

Final AnswerThe turbojet engine.

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