🔍 Key Concepts

• Positive displacement pump vs. variable displacement pump – what is fixed and what can change • How flow rate relates to pump speed in a fixed displacement design • Which components listed (shaft trunnion block, tilting plate, slide block/rotor) are typically found on variable displacement or vane-type pumps

💭 Think About

• First, recall what the term positive fixed displacement means for the amount of fluid moved per revolution. Does this design normally use tilting plates or trunnion blocks? • Ask yourself: if the displacement per revolution is fixed by design, what is the only practical way to change how much fluid is delivered per unit time? • Look at each choice and decide: is this part of a variable-displacement or variable-delivery design, or is it simply a way to change how fast the pump turns?

✅ Before You Answer

• Be clear on the definition: in a fixed displacement pump, the volume per revolution is constant and cannot be altered by internal geometry changes. • Check which components (tilting plate, trunnion block, slide block and rotor) are characteristic of axial-piston variable-displacement or vane pumps, not fixed displacement. • Verify which option changes output per unit time without changing the pump’s built-in displacement per revolution.