Which outcome occurs when a mechanism is over-engineered?

• A. Improved reliability and easier maintenance.
• B. Faster production but higher failure rates.
• C. Increased complexity that hurts reliability and maintainability.
• D. Lower part count but higher performance.

Answer: (C)

Over-engineering a mechanism tends to add unnecessary complexity. When more parts, tighter tolerances, or extra features are included beyond what’s needed, you introduce more potential points of failure and more maintenance tasks. Each additional component or interaction can wear, misalign, or drift, making diagnosis harder and downtime longer. The end result is reduced reliability in practice and greater effort required to keep the system serviced and functioning. That’s why the outcome described—more complexity that hurts reliability and maintainability—fits best.