Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A gear pump has an input shaft speed of 1800 RPM and a displacement of 50 cm³ per revolution. If the volumetric efficiency is 90%, what is the actual output flow rate of the pump in litres per minute (L/min)?
The theoretical flow rate is (50 cm³/rev * 1800 rev/min) = 90,000 cm³/min = 90 L/min. With 90% volumetric efficiency, the actual flow rate is 90 L/min * 0.90 =
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Question: A gear pump has an input shaft speed of 1800 RPM and a displacement of 50 cm³ per revolution. If the volumetric efficiency is 90%, what is the actual output flow rate of the pump in litres per minute (L/min)?
Answer options: ✅ 81 L/min
- 90 L/min
- 8.1 L/min
- 9.0 L/min
Correct answer: 81 L/min
Explanation: The theoretical flow rate is (50 cm³/rev * 1800 rev/min) = 90,000 cm³/min = 90 L/min. With 90% volumetric efficiency, the actual flow rate is 90 L/min * 0.90 = 81 L/min. This calculation is fundamental for understanding pump performance.
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