Hoisting machinery on tender class vessels falls into three main categories?

• A. Electric, pneumatic, and hydraulic
• B. Electric, hydraulic, and steam
• C. Pneumatic, hydraulic, and mechanical
• D. Mechanical, electrical, and hydraulic

Answer: (A)

Hoisting machinery on tender class vessels is categorized by the type of power driving the hoist: electric motors, hydraulic fluid pressure, or compressed air. Electric drive provides precise control and easy integration with ship electrical systems, making it ideal for repeated, controllable lifting. Hydraulic drive offers high lifting force and smooth, strong performance for heavier loads, though it requires a hydraulic circuit and fluid maintenance. Pneumatic (air) drive is clean and fast for light to moderate lifts and in environments where electrical or hydraulic systems are less desirable, but it generally cannot match hydraulic power for very heavy loads. Steam-driven or purely mechanical systems aren’t the standard trio used aboard these vessels today, so the three main categories are electric, hydraulic, and pneumatic.