Identify the incorrect statement regarding engine placement in single-, twin-, and three-engine aeroplanes.
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AIn single-engine aeroplanes, the engine is mounted in the nose.
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BIn twin-engine aeroplanes, one engine is mounted on each wing symmetrically.
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CIn three-engine aeroplanes, two engines are placed on both wings and one engine is placed in the tail.
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DNone of these.
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EIn three-engine aeroplanes, two engines are placed on the wings and one in the tail (total three).
Answer
Correct Answer: In three-engine aeroplanes, two engines are placed on both wings and one engine is placed in the tail.
Explanation
Introduction:This item checks understanding of common propulsion layouts. Typical configurations include single-engine nose mount, twin-engine wing mounts, and tri-jet arrangements with two wing engines plus one tail/empennage engine.
Given Data / Assumptions:
- Single-engine aircraft often use a nose-mounted piston/turboprop/turbofan.
- Twin-engine layouts commonly place one engine on each wing.
- Three-engine (tri-jet) aircraft historically used two wing engines plus one tail engine.
Concept / Approach:
Evaluate each statement for correctness; identify the one that misstates the tri-engine arrangement count/placement.
Step-by-Step Solution:
Check single-engine: nose mount is standard → correct.Check twin-engine: symmetric wing mounts → correct.Check three-engine: the phrase “two engines are placed on both wings” implies four engines in wings plus one in tail (total five), which is incorrect.Therefore option with that phrasing is incorrect.Verification / Alternative check:
Classical tri-jets (e.g., DC-10/MD-11) use two wing engines and one tail engine, totaling three, not “two on both wings.”
Why Other Options Are Wrong:
- Option A: Standard for many singles; acceptable.
- Option B: Typical twin-engine layout; acceptable.
- Option D: Not applicable because an incorrect statement exists.
- Option E: Clarifies the correct tri-engine arrangement; not the asked incorrect one.
Common Pitfalls:
- Misreading “both wings” as “each wing,” which changes the engine count.
- Assuming tail-mounted twins or nose-mounted twins as defaults.
Final Answer:
In three-engine aeroplanes, two engines are placed on both wings and one engine is placed in the tail.