DC Boiler Exam Prep 2023 (Formulas and constants used for the DC 3rd class boiler exam) QUESTIONS WITH 100% CORRECT ANSWERS
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Course
DC Boiler
Institution
DC Boiler
DC Boiler Exam Prep 2023 (Formulas and constants used for the DC 3rd class boiler exam) QUESTIONS WITH 100% CORRECT ANSWERS
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 Cylind...
DC Boiler Exam Prep 2023 (Formulas and constants used
for the DC 3rd class boiler exam) QUESTIONS WITH
100% CORRECT ANSWERS
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
/.Formula for Mechanical Horsepower - Answer-= Power ÷ 33,000 ft-lb/min
/.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
/.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
/.Horsepower formula - Answer-= ft-lb/min ÷ 33000 ft-lb/min
/.ft-lb formula for a pump - Answer-= gpm x 8.33 x head (ft)
/.Factor of Evaporation (FE) = - Answer-= [Hs - (tfw-32)] ÷ 970.3
Hs = Enthalpy of steam
tfw = temperature of feed water
/.Latent Heat of Vaporization for Water - Answer-970.3 Btu/lb
/.Latent Heat of Fusion for Water - Answer-144 Btu/lb
/.1 Boiler Horsepower = x lbs of steam generator per hour - Answer-34.5 lbs/hr
/.1 Boiler Horsepower = x Btu/hr - Answer-33,475 Btu/hr
/.1 BHP = x ft² of heating surface (general) - Answer-10 ft² heating surface
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