How can torque be adjusted in mechanical applications?

In mechanical applications, torque can be effectively adjusted using various methods, and one of the most accurate ways is through the use of a torque wrench. A torque wrench is a specialized tool designed to apply a specific amount of torque to a fastener, such as a bolt or nut. By setting the desired torque value, the user can control the amount of rotational force applied to the fastener, which is crucial for ensuring proper assembly and function in mechanical systems.

This method allows for precision and repeatability, making it essential in applications where the correct torque is necessary for safety and performance, such as in automotive and machinery maintenance. A torque wrench not only helps prevent over-tightening, which can cause damage, but also under-tightening, which can lead to failure.

While other options may influence torque indirectly, such as changing a motor's speed or using variable pulleys, they do not provide the precise control offered by a torque wrench.