🔍 Key Concepts

• Hydraulic steering systems need high-pressure, precise flow control for moving the rudder • Difference between positive displacement pumps (for hydraulic oil) and centrifugal pumps (often for large water flows) • Typical pump types used in marine hydraulic power packs for steering gear

💭 Think About

• Which of these pump types is best suited to supply high-pressure hydraulic oil with accurate, steady flow to control a rudder? • Look at each option and ask: is this usually used for hydraulics or more often for water or viscous liquids like fuel/lube oil? • Which option is clearly associated with centrifugal water pumps rather than with high-pressure hydraulic systems?

✅ Before You Answer

• Identify which choice is a centrifugal pump casing shape (commonly used for seawater, not steering hydraulics) and rule that one out first • From the remaining options, focus on the pump that is known for high-pressure, positive displacement hydraulic service • Verify in your notes which pump types are commonly listed with steering gear power units on marine vessels