Identify the incorrect statement regarding engine placement in single-, twin-, and three-engine aeroplanes.

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:

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.