The net speed under which the turbine reaches its peak efficiency is called A. design speed B. rated speed C. gross speed D. operating speed

The correct answer is: B. rated speed.

The rated speed of a turbine is the speed at which it is designed to operate at its peak efficiency. This speed is usually specified by the manufacturer and is important to maintain in order to ensure the safe and efficient operation of the turbine.

The other options are incorrect because:

• A. design speed is the speed at which the turbine is designed to operate. However, this speed may not be the same as the rated speed, as the turbine may be able to operate at a higher
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  or lower speed without compromising its efficiency.
• C. gross speed is the speed at which the turbine is rotating. However, this speed may not be the same as the rated speed, as the turbine may be rotating at a higher or lower speed due to factors such as load conditions.
• D. operating speed is the speed at which the turbine is actually operating. However, this speed may not be the same as the rated speed, as the operator may choose to operate the turbine at a higher or lower speed for reasons such as load conditions or to save energy.