DC Boiler Exam Prep 2024/2025 Exam
Questions and Correct Answers | New
Update
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,or (Force x Distance) ÷ Time
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
, 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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
Questions and Correct Answers | New
Update
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,or (Force x Distance) ÷ Time
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
, 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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
