Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A hydraulic system is designed with a fixed-displacement gear pump. If the system's working pressure increases from 10,000 kPa to 20,000 kPa due to a heavier load, how does the theoretical flow rate from the pump change?
For a fixed-displacement pump, the theoretical flow rate is determined by the pump's displacement and rotational speed, largely independent of the system pressu
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Question: A hydraulic system is designed with a fixed-displacement gear pump. If the system's working pressure increases from 10,000 kPa to 20,000 kPa due to a heavier load, how does the theoretical flow rate from the pump change?
Answer options:
- It doubles
- It decreases by half
- It decreases slightly due to increased internal leakage ✅ It remains essentially constant
Correct answer: It remains essentially constant
Explanation: For a fixed-displacement pump, the theoretical flow rate is determined by the pump's displacement and rotational speed, largely independent of the system pressure (assuming the pump is operating within its rated limits and not in relief). Increased pressure primarily affects the power consumed and internal leakage, not the theoretical flow.
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