For a variable torque/variable horsepower (VT/VH) load, an increase in operating speed requires an increase in ___.

In the context of variable torque/variable horsepower loads, understanding how speed, torque, and horsepower interact is key to answering the question. For loads that fall under this category, as the operating speed of the motor or load increases, the horsepower must also increase to maintain performance. This is due to the relationship between torque, horsepower, and speed. Horsepower is calculated using the formula:

Horsepower (HP) = (Torque (ft-lbs) × Speed (RPM)) / 5252

As speed increases, if we want to keep the load functioning effectively, we must ensure that horsepower is adequate for the increased speed. Therefore, an increase in horsepower will be necessary as the load performs at higher speeds.

Additionally, for variable torque applications, torque may also have to increase to maintain the required load characteristics at higher speeds. Since both factors are interrelated in this scenario, an increase in operating speed leads to a requirement for an increase in both torque and horsepower to ensure efficient operation.

This interconnected relationship defines why the choice indicating that both torque and horsepower need to increase is accurate. It reflects the fundamental principles governing the operation of motors and load dynamics in variable torque/variable horsepower systems.