Advantage: Good control and regulation.

• A. Favorable heat dissipation
• B. Good control and regulation
• C. Pollution by waste oil
• D. High startup speed

Answer: (B)

Achieving good control and regulation comes from using a closed-loop setup where feedback informs the actuator so output matches the desired value. In hydraulic or electromechanical systems, sensors monitor pressure, speed, or position, a controller compares this with the target, and the valve or actuator adjusts flow or force to minimize any error. This feedback loop is what delivers precise, repeatable, and stable operation, making good control and regulation the clear advantage.

Other options describe things like heat management, environmental waste, or rapid initial response, which are not the same as accurate, steady control. Heat dissipation is about handling thermal load, pollution by waste oil is a negative consequence, and high startup speed emphasizes speed rather than steady, controlled regulation.