Which statement describes an advantage of using a flexible coupling to connect a motor to its load?

Which statement describes an advantage of using a flexible coupling to connect a motor to its load?

• A. It eliminates all misalignment
• B. The motor must be perfectly aligned with the load
• C. The coupling can absorb vibration in the motor or the load
• D. It reduces electrical noise in the system

Answer: (C)

Flexible coupling use lets the connection absorb movement and vibration between motor and load, rather than transmitting it directly. This compatibility with small angular, parallel, and axial misalignments within the coupling’s tolerance reduces bending moments on shafts and bearing wear, and dampens shocks from startup or loading. That’s why it’s advantageous to have a coupling that can absorb vibration in either the motor or the load. The other ideas don’t fit as advantages: you can’t expect to eliminate all misalignment with a coupling, perfect alignment isn’t necessary when a flexible coupling is used, and reducing electrical noise isn’t the primary benefit of a mechanical connector.

Flexible coupling use lets the connection absorb movement and vibration between motor and load, rather than transmitting it directly. This compatibility with small angular, parallel, and axial misalignments within the coupling’s tolerance reduces bending moments on shafts and bearing wear, and dampens shocks from startup or loading. That’s why it’s advantageous to have a coupling that can absorb vibration in either the motor or the load. The other ideas don’t fit as advantages: you can’t expect to eliminate all misalignment with a coupling, perfect alignment isn’t necessary when a flexible coupling is used, and reducing electrical noise isn’t the primary benefit of a mechanical connector.