When operating at different speeds, a motor may be required to deliver ___ to a driven load.

In the context of motor operation, the term used to describe the relationship between speed and power delivery is crucial for understanding how motors function under varying conditions. When motors operate at different speeds, they can indeed be required to deliver variable horsepower, constant torque, or constant horsepower depending on the application.

Variable horsepower is commonly encountered in scenarios where the load requirements change significantly with speed. For example, in variable speed applications, the horsepower needs may fluctuate based on the load's characteristics and the desired speed.

Constant torque is typically associated with applications where the load remains consistent regardless of the speed. In such cases, the motor supplies the same amount of power as the speed changes, making it essential to maintain consistent performance.

On the other hand, constant horsepower systems are designed to allow horsepower to remain the same across a range of speeds. This means that as speed increases, the available torque decreases, and vice versa, allowing for optimized performance under different conditions.

Given that a motor can be configured to deliver any of these power characteristics based on the application requirements, the correct choice encompasses all possibilities. This understanding illustrates the flexibility of motors in various applications, which is fundamental for electrical contractors working with different equipment configurations and load demands.