🔍 Key Concepts

• Identify the type of hydraulic machine shown by looking at the cylinder block, multiple pistons, and angle (swashplate) housing. • Think about how changing the angle housing would affect the stroke of the pistons and therefore the flow output. • Consider which options describe a function (what it does) versus a specific shipboard service (where it’s used).

💭 Think About

• How does an adjustable angle or swashplate in a piston assembly change the volume of fluid moved per revolution? • Which choices describe a device whose capacity or displacement can be varied, regardless of what system it is installed in? • If this unit were driven at constant shaft speed, what part of the drawing allows you to increase or decrease the pump output without changing RPM?

✅ Before You Answer

• Verify which answer choice directly refers to variable displacement / variable output rather than a particular application like lube oil or hatch gear. • Check the illustration labels (cylinder block, pistons, angle housing, valve plate) against what you know about axial-piston swashplate units. • Confirm that the selected choice could describe this unit in any hydraulic system, not just one specific use on board.