DC Boiler Exam Study Guide – Practice Questions with Answers. GRADED A+. Latest 2026/2027 Update.

DC Boiler Exam Study Guide –
Practice Questions with
Answers. GRADED A+. Latest
2026/2027 Update.




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