🔍 Key Concepts

• Hydraulic vs. electric power characteristics (how each handles speed, force, and precision) • What preload means in a jacking system and what actually affects it • Operational needs of a jacking operation (startup, monitoring, and adjustments)

💭 Think About

• Which type of system (hydraulic or electric) is generally more complex mechanically, and how does that affect likely maintenance needs? • During a jacking operation, what aspect is most critical: the amount of preload, the number of people, or how precisely you can start/stop and adjust movement? • Think about which power type is known for smooth, variable speed and fine positioning—how does that relate to these four choices?

✅ Before You Answer

• Compare which system typically has more moving mechanical parts that can wear (for the maintenance option). • Ask whether preload is determined mainly by the power type, or by structural/sea conditions and design limits. • For each choice, test: does this sound like a known strength of hydraulic systems in general (especially regarding smooth, precise control)?