Which of the following is an advantage of using flexible couplings?

Using flexible couplings is advantageous because they absorb shocks and vibrations in mechanical systems. This capability is essential for protecting equipment from damage caused by sudden changes in load or misalignment between connected shafts. By mitigating the effects of these shocks and vibrations, flexible couplings can enhance the longevity of machinery and ensure smoother operation. This feature is especially valuable in applications where equipment is subjected to fluctuating loads or where precise alignment is difficult to maintain.

In contrast to other options, which do not accurately represent the function or benefit of flexible couplings, the ability to absorb shocks and vibrations distinctly highlights their importance in mechanical drives and systems.