Heavy Duty Equipment Technician Red Seal Exam Prep · Question
What is the primary advantage of a variable displacement piston pump over a fixed displacement gear pump in terms of energy efficiency for a mobile heavy equipment application?
Variable displacement piston pumps can change their displacement (and thus flow output) based on system demand. This means they only pump the required amount of
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Question: What is the primary advantage of a variable displacement piston pump over a fixed displacement gear pump in terms of energy efficiency for a mobile heavy equipment application?
Answer options:
- Variable pumps are less prone to cavitation
- Variable pumps provide constant flow regardless of engine speed ✅ Variable pumps can adjust flow output to meet demand, reducing wasted energy and heat generation
- Variable pumps are significantly cheaper to manufacture and maintain
Correct answer: Variable pumps can adjust flow output to meet demand, reducing wasted energy and heat generation
Explanation: Variable displacement piston pumps can change their displacement (and thus flow output) based on system demand. This means they only pump the required amount of oil, minimizing excess flow that would otherwise be pumped over a relief valve, thus saving energy and reducing heat generation, unlike fixed displacement pumps.
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