Question 2Motor Plants - Assistant Engineer
70% to passWhat 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?
A645 ft/min (196 m/min)
B1291 ft/min (393 m/min)
C2582 ft/min (787 m/min)
D7749 ft/min (2362 m/min)
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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