Question 2Motor Plants - Assistant Engineer70% to pass
What is the average piston speed of a five cylinder low-speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 inches (160 cm), and a rated speed of 123 RPM?
AI Explanation
The correct answer is B) 1291 ft/min (393 m/min).
To calculate the average piston speed, we use the formula: Piston Speed (ft/min) = 2 x Stroke (ft) x RPM / 12. Plugging in the given values, we get: Piston Speed = 2 x 5.25 ft x 123 RPM / 12 = 1291 ft/min.
The other options are incorrect because:
A) 645 ft/min is half the correct value.
C) 2582 ft/min is twice the correct value.
D) 7749 ft/min is too high and does not match the given parameters.
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