Class 5 Boiler Practice Exam

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How many inches of water column does 1 psi equal approximately?

27.68 inches
28.42 inches
29.92 inches
30 inches

The correct answer is: 28.42 inches

The correct value for how many inches of water column correspond to 1 psi is approximately 27.68 inches. This conversion is based on the relationship between pressure units, where 1 psi (pound per square inch) is equal to about 27.68 inches of water column. Understanding this conversion is vital as it helps professionals in the field of boiler operations and maintenance to gauge and compare pressure readings accurately in various forms, particularly when dealing with water column measurements which are commonly used for evaluating low-pressure systems. While the other options present values that are commonly used in discussions about pressure and fluid dynamics, the specific conversion of 1 psi to approximately 27.68 inches of water column is the standard figure that should be referenced for accurate calculations and assessments in a boiler context.