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DC Boiler Exam Prep (Formulas and constants used for the DC 3rd class boiler exam) QUESTIONS
WITH COMPLETE SOLUTIONS
Area of a rectangle Length x Width
Area of a Circle .7854 x Diameter²
Volume of a Box Length x Width x Height
Volume of a Cylinder .7854 x Diameter² x Length
Circumference of a Circle π x Diameter
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Unit of Force Pound (lb)
Formula for Force Pressure ÷ Area
Unit of Work in-lb or ft-lb
Formula for Work Force x Distance
Unit of Power ft-lb/min
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Formula for Power = Work ÷ Time or (Force x Distance) ÷ Time
Formula for Mechanical Horsepower = Power ÷ 33,000 ft-lb/min
Fahrenheit to Celsius
°C = (°F - 32) ÷ 1.8
Celsius to Fahrenheit °F = (1.8 x °C) - 32
Fahrenheit to Rankine
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°R = °F + 460
Celsius to Kelvin
K = °C +273.15
Charles' First Law Volume1 / Pressure1 = Volume2 / Pressure2
Charles' Second Law Pressure1 / Temperature1 = Pressure2 / Temperature2
Boyle's Law Pressure1 x Volume1 = Pressure2 x Volume2
General Gas Law