Power transmission: Keys (e.g., parallel, Woodruff) are used between a shaft and a hub such as a pulley or wheel to prevent relative rotation and sometimes axial slip. Decide whether the statement “Keys can be used to prevent movement between shafts and wheels” is correct.

Introduction / Context:
Shafts transmit torque to hubs (wheels, pulleys, gears). Keys seated in keyways prevent relative rotation by providing a positive mechanical engagement. We test whether the statement about using keys to prevent movement is correct.

Given Data / Assumptions:

• Key types include square/rectangular, Woodruff, and feather keys.
• Keyways are machined in both shaft and hub.
• Set screws or retaining rings may supplement axial restraint.

Concept / Approach:
The key transmits torque by shear and bearing between the key and keyways. Proper fit prevents rotation; axial restraint may require set screws, shoulders, or feather keys with splines. For a wheel on a keyed shaft, the wheel cannot spin freely relative to the shaft under design load.

Step-by-Step Solution:
1) Machine matching keyways in shaft and hub.2) Select key size per torque and material.3) Insert key and assemble hub to seat fully.4) Add axial retention as needed (collars, set screws).

Verification / Alternative check:
Torque calculations confirm transmitted load via key shear and bearing; failure analyses correlate slipping hubs with worn keyways or undersized keys.

Why Other Options Are Wrong:
“Incorrect”: Contradicts standard power transmission practice.“Decorative only”: Keys are functional load-bearing elements.“Allow slip by design”: Keys intentionally prevent slip; clutches handle controlled slip.

Common Pitfalls:
Mis-sizing keys; improper chamfers; neglecting axial retention; fretting due to poor fit or lack of lubrication in high-vibration environments.

Final Answer:
Correct