Question 398General Subjects - Assistant Engineer
70% to passIf you have a duplex, single acting, reciprocating pump making 140 strokes/minute with a 3" diameter cylinder, and a 12" stroke with a 94% volumetric efficiency, what is the capacity of this pump?
A28 gpm
B38 gpm
C48 gpm
D58 gpm
AI Explanation
The correct answer is C) 48 gpm. To calculate the capacity of the pump, we can use the formula: Capacity (in gallons per minute) = (Piston Displacement) x (Strokes per Minute) x (Volumetric Efficiency) Where: - Piston Displacement = (π/4) x (Diameter^2) x (Stroke) - Strokes per Minute = 140 - Volumetric Efficiency = 94% Plugging in the values: - Piston Displacement = (π/4) x (3^2) x 12 = 85.03 cubic inches - Strokes per Minute = 140 - Volumetric Efficiency = 94% Capacity = (85.03 cubic inches) x (140 strokes/minute) x (0.94) / (231 cubic inches/gallon) = 48 gpm The other options are incorrect because they do not match the calculated capacity of 48 gpm.
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