Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A piston pump on a municipal snowplow truck has 9 pistons, each with a bore of 20 mm and a stroke of 15 mm. If the pump operates at 2000 RPM, what is its theoretical displacement in cm³ per revolution?
The volume of a single piston's stroke is π * (bore/2)² * stroke. So, π * (1 cm)² * 1.5 cm = 4.71 cm³. For 9 pistons, the total theoretical displacement per rev
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Question: A piston pump on a municipal snowplow truck has 9 pistons, each with a bore of 20 mm and a stroke of 15 mm. If the pump operates at 2000 RPM, what is its theoretical displacement in cm³ per revolution?
Answer options: ✅ 42.4 cm³/revolution
- 4.71 cm³/revolution
- 4241 cm³/revolution
- 47.1 cm³/revolution
Correct answer: 42.4 cm³/revolution
Explanation: The volume of a single piston's stroke is π * (bore/2)² * stroke. So, π * (1 cm)² * 1.5 cm = 4.71 cm³. For 9 pistons, the total theoretical displacement per revolution is 9 * 4.71 cm³ = 42.4 cm³/revolution. (Note: 20 mm = 2 cm, 15 mm = 1.5 cm). This calculates the total swept volume per revolution.
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