DC Boiler Exam Prep 2023 (Formulas and constants used for the DC 3rd class boiler exam) QUESTIONS WITH COMPLETE SOLUTIONS.
DC Boiler Exam Prep 2023 (Formulas and constants used for the DC 3rd class boiler exam) QUESTIONS WITH COMPLETE SOLUTIONS.
DC Boiler Exam Prep 2023 (Formulas and constants us...
DC Boiler Exam Prep 2023 (Formulas and constants used
for the DC 3rd class boiler exam) QUESTIONS WITH
COMPLETE SOLUTIONS (2024/
2025)
1.Area of a rectangle: Length x Width
2.Area of a Circle: .7854 x Diameter²
3.Volume of a Box: Length x Width x Height
4.Volume of a Cylinder: .7854 x Diameter² x Length
5.Circumference of a Circle: Àx Diameter
6.Unit of Force: Pound (lb)
7.Formula for Force: Pressure ÷ Area
8.Unit of Work: in-lb or ft-lb
,9.Formula for Work: Force x Distance
10.Unit of Power: ft-lb/min
11.Formula for Power: = Work
÷ Time or (Force x Distance) ÷
Time
12.Formula for Mechanical Horsepower: = Power ÷ 33,000 ft-lb/min
13.Fahrenheit to Celsius: °C = (°F - 32) ÷ 1.8
14.Celsius to Fahrenheit: °F = (1.8 x °C) - 32
15.Fahrenheit to Rankine: °R = °F + 460
16.Celsius to Kelvin: K = °C +273.15
17.Charles' First Law: Volume1 / Pressure1 = Volume2 / Pressure2
18.Charles' Second Law: Pressure1 / Temperature1 = Pressure2 /
Temperature2
,19.Boyle's Law: Pressure1 x Volume1 = Pressure2 x Volume2
20.General Gas Law: (Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2
21.Formula for Levers: Resistance x DistanceR = Effort x DistanceE
22.Formula for Inclined Planes: Force x Length = Resistance x Heigh
23.Formula for Wheel & Axel: Force x DistanceF = Resistance x
DistanceR
24.Torque: Force x Radius
25.Safe Working Pressure of a Riveted Boiler (SWP): (Area of
Staybolt x Stress Constant of Staybolt) ÷ Area Covered by Staybolt or =
(a x C) ÷ A
26.Area Covered by Staybolt: = Pitch x Pitch
27.Longitudinal Stress: (P x D x
L) / 2t P = Pressure
, D=
Diameter L
= Length
t = thickness of steel
28.Boiler Heating Surface (tubes) =: =
C x L x # C = Circumference of tubes
L = Length of
tubes # =
Number of tubes
HS = Àx Diameter x Length x Number of Tubes
29.Watts per Boiler Horsepower: 746 Watts
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