DC Boiler Exam Prep 2024 (Formulas and
constants used for the DC 3rd class boiler exam)
Area of a rectangle - ANSWER--Length x Width
Area of a Circle - ANSWER--.7854 x Diameter²
Volume of a Box - ANSWER--Length x Width x Height
Volume of a Cylinder - ANSWER--.7854 x Diameter² x Length
Circumference of a Circle - ANSWER--π x Diameter
Unit of Force - ANSWER--Pound (lb)
Formula for Force - ANSWER--Pressure ÷ Area
Unit of Work - ANSWER--in-lb or ft-lb
Formula for Work - ANSWER--Force x Distance
Unit of Power - ANSWER--ft-lb/min
Formula for Power - ANSWER--= Work ÷ Time
or (Force x Distance) ÷ Time
, DC Boiler Exam Prep 2024 (Formulas and
constants used for the DC 3rd class boiler exam)
Formula for Mechanical Horsepower - ANSWER--= Power ÷ 33,000 ft-lb/min
Fahrenheit to Celsius - ANSWER--°C = (°F - 32) ÷ 1.8
Celsius to Fahrenheit - ANSWER--°F = (1.8 x °C) - 32
Fahrenheit to Rankine - ANSWER--°R = °F + 460
Celsius to Kelvin - ANSWER--K = °C +273.15
Charles' First Law - ANSWER--Volume1 / Pressure1 = Volume2 / Pressure2
Charles' Second Law - ANSWER--Pressure1 / Temperature1 = Pressure2 /
Temperature2
Boyle's Law - ANSWER--Pressure1 x Volume1 = Pressure2 x Volume2
General Gas Law - ANSWER--(Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2
Formula for Levers - ANSWER--Resistance x DistanceR = Effort x DistanceE
Formula for Inclined Planes - ANSWER--Force x Length = Resistance x Height
, DC Boiler Exam Prep 2024 (Formulas and
constants used for the DC 3rd class boiler exam)
Formula for Wheel & Axel - ANSWER--Force x DistanceF = Resistance x DistanceR
Torque - ANSWER--Force x Radius
Safe Working Pressure of a Riveted Boiler (SWP) - ANSWER--(Area of Staybolt x
Stress Constant of Staybolt) ÷ Area Covered by Staybolt or = (a x C) ÷ A
Area Covered by Staybolt - ANSWER--= Pitch x Pitch
Longitudinal Stress - ANSWER--(P x D x L) / 2t
P = Pressure
D = Diameter
L = Length
t = thickness of steel
Boiler Heating Surface (tubes) = - ANSWER--= C x L x #
C = Circumference of tubes
L = Length of tubes
# = Number of tubes
HS = π x Diameter x Length x Number of Tubes
Watts per Boiler Horsepower - ANSWER--746 Watts
constants used for the DC 3rd class boiler exam)
Area of a rectangle - ANSWER--Length x Width
Area of a Circle - ANSWER--.7854 x Diameter²
Volume of a Box - ANSWER--Length x Width x Height
Volume of a Cylinder - ANSWER--.7854 x Diameter² x Length
Circumference of a Circle - ANSWER--π x Diameter
Unit of Force - ANSWER--Pound (lb)
Formula for Force - ANSWER--Pressure ÷ Area
Unit of Work - ANSWER--in-lb or ft-lb
Formula for Work - ANSWER--Force x Distance
Unit of Power - ANSWER--ft-lb/min
Formula for Power - ANSWER--= Work ÷ Time
or (Force x Distance) ÷ Time
, DC Boiler Exam Prep 2024 (Formulas and
constants used for the DC 3rd class boiler exam)
Formula for Mechanical Horsepower - ANSWER--= Power ÷ 33,000 ft-lb/min
Fahrenheit to Celsius - ANSWER--°C = (°F - 32) ÷ 1.8
Celsius to Fahrenheit - ANSWER--°F = (1.8 x °C) - 32
Fahrenheit to Rankine - ANSWER--°R = °F + 460
Celsius to Kelvin - ANSWER--K = °C +273.15
Charles' First Law - ANSWER--Volume1 / Pressure1 = Volume2 / Pressure2
Charles' Second Law - ANSWER--Pressure1 / Temperature1 = Pressure2 /
Temperature2
Boyle's Law - ANSWER--Pressure1 x Volume1 = Pressure2 x Volume2
General Gas Law - ANSWER--(Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2
Formula for Levers - ANSWER--Resistance x DistanceR = Effort x DistanceE
Formula for Inclined Planes - ANSWER--Force x Length = Resistance x Height
, DC Boiler Exam Prep 2024 (Formulas and
constants used for the DC 3rd class boiler exam)
Formula for Wheel & Axel - ANSWER--Force x DistanceF = Resistance x DistanceR
Torque - ANSWER--Force x Radius
Safe Working Pressure of a Riveted Boiler (SWP) - ANSWER--(Area of Staybolt x
Stress Constant of Staybolt) ÷ Area Covered by Staybolt or = (a x C) ÷ A
Area Covered by Staybolt - ANSWER--= Pitch x Pitch
Longitudinal Stress - ANSWER--(P x D x L) / 2t
P = Pressure
D = Diameter
L = Length
t = thickness of steel
Boiler Heating Surface (tubes) = - ANSWER--= C x L x #
C = Circumference of tubes
L = Length of tubes
# = Number of tubes
HS = π x Diameter x Length x Number of Tubes
Watts per Boiler Horsepower - ANSWER--746 Watts
