DC Boiler Exam Prep 2015
Area of a rectangle ANS: Length x Width
Area of a Circle ANS: .7854 x Diameter²
Volume of a Box ANS: Length x Width x Height
Volume of a Cylinder ANS: .7854 x Diameter² x Length
Circumference of a Circle ANS: π x Diameter
Unit of Force ANS: Pound (lb)
Formula for Force ANS: Pressure ÷ Area
Unit of Work ANS: in-lb or ft-lb
Formula for Work ANS: Force x Distance
Unit of Power ANS: ft-lb/min
Formula for Power ANS: = Work ÷ Time
or (Force x Distance) ÷ Time
,Formula for Mechanical Horsepower ANS: = Power ÷ 33,000 ft-lb/min
Fahrenheit to Celsius ANS: °C = (°F - 32) ÷ 1.8
Celsius to Fahrenheit ANS: °F = (1.8 x °C) - 32
Fahrenheit to Rankine ANS: °R = °F + 460
Celsius to Kelvin ANS: K = °C +273.15
Charles' First Law ANS: Volume1 / Pressure1 = Volume2 / Pressure2
Charles' Second Law ANS: Pressure1 / Temperature1 = Pressure2 / Temperature2
Boyle's Law ANS: Pressure1 x Volume1 = Pressure2 x Volume2
General Gas Law ANS: (Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2
Formula for Levers ANS: Resistance x DistanceR = Effort x DistanceE
Formula for Inclined Planes ANS: Force x Length = Resistance x Height
Formula for Wheel & Axel ANS: Force x DistanceF = Resistance x DistanceR
Torque ANS: Force x Radius
, Safe Working Pressure of a Riveted Boiler (SWP) ANS: (Area of Staybolt x Stress Constant of Staybolt) ÷
Area Covered by Staybolt or = (a x C) ÷ A
Area Covered by Staybolt ANS: = Pitch x Pitch
Longitudinal Stress ANS: (P x D x L) / 2t
P = Pressure
D = Diameter
L = Length
t = thickness of steel
Boiler Heating Surface (tubes) = ANS: = 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 ANS: 746 Watts
Horsepower formula ANS: = ft-lb/min ÷ 33000 ft-lb/min
ft-lb formula for a pump ANS: = gpm x 8.33 x head (ft)
Factor of Evaporation (FE) = ANS: = [Hs - (tfw-32)] ÷ 970.3
Hs = Enthalpy of steam
Area of a rectangle ANS: Length x Width
Area of a Circle ANS: .7854 x Diameter²
Volume of a Box ANS: Length x Width x Height
Volume of a Cylinder ANS: .7854 x Diameter² x Length
Circumference of a Circle ANS: π x Diameter
Unit of Force ANS: Pound (lb)
Formula for Force ANS: Pressure ÷ Area
Unit of Work ANS: in-lb or ft-lb
Formula for Work ANS: Force x Distance
Unit of Power ANS: ft-lb/min
Formula for Power ANS: = Work ÷ Time
or (Force x Distance) ÷ Time
,Formula for Mechanical Horsepower ANS: = Power ÷ 33,000 ft-lb/min
Fahrenheit to Celsius ANS: °C = (°F - 32) ÷ 1.8
Celsius to Fahrenheit ANS: °F = (1.8 x °C) - 32
Fahrenheit to Rankine ANS: °R = °F + 460
Celsius to Kelvin ANS: K = °C +273.15
Charles' First Law ANS: Volume1 / Pressure1 = Volume2 / Pressure2
Charles' Second Law ANS: Pressure1 / Temperature1 = Pressure2 / Temperature2
Boyle's Law ANS: Pressure1 x Volume1 = Pressure2 x Volume2
General Gas Law ANS: (Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2
Formula for Levers ANS: Resistance x DistanceR = Effort x DistanceE
Formula for Inclined Planes ANS: Force x Length = Resistance x Height
Formula for Wheel & Axel ANS: Force x DistanceF = Resistance x DistanceR
Torque ANS: Force x Radius
, Safe Working Pressure of a Riveted Boiler (SWP) ANS: (Area of Staybolt x Stress Constant of Staybolt) ÷
Area Covered by Staybolt or = (a x C) ÷ A
Area Covered by Staybolt ANS: = Pitch x Pitch
Longitudinal Stress ANS: (P x D x L) / 2t
P = Pressure
D = Diameter
L = Length
t = thickness of steel
Boiler Heating Surface (tubes) = ANS: = 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 ANS: 746 Watts
Horsepower formula ANS: = ft-lb/min ÷ 33000 ft-lb/min
ft-lb formula for a pump ANS: = gpm x 8.33 x head (ft)
Factor of Evaporation (FE) = ANS: = [Hs - (tfw-32)] ÷ 970.3
Hs = Enthalpy of steam
