DC Boiler Exam Prep 2024/25 exam questions with complete solution
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Course
DC Boiler
Institution
DC Boiler
Area of a rectangle - correct answer Length x Width
Area of a Circle - correct answer .7854 x Diameter²
Volume of a Box - correct answer Length x Width x Height
Volume of a Cylinder - correct answer .7854 x Diameter² x Length
Circumference of a Circle - correct answer π x Diameter
Unit of F...
DC Boiler Exam Prep 2024/25 exam questions with complete
solution
Area of a rectangle - correct answer Length x Width
Area of a Circle - correct answer .7854 x Diameter²
Volume of a Box - correct answer Length x Width x Height
Volume of a Cylinder - correct answer .7854 x Diameter² x Length
Circumference of a Circle - correct answer π x Diameter
Unit of Force - correct answer Pound (lb)
Formula for Force - correct answer Pressure ÷ Area
Unit of Work - correct answer in-lb or ft-lb
Formula for Work - correct answer Force x Distance
Unit of Power - correct answer ft-lb/min
Formula for Power - correct answer = Work ÷ Time
or (Force x Distance) ÷ Time
Formula for Mechanical Horsepower - correct answer = Power ÷ 33,000 ft-lb/min
Fahrenheit to Celsius - correct answer °C = (°F - 32) ÷ 1.8
Celsius to Fahrenheit - correct answer °F = (1.8 x °C) - 32
Fahrenheit to Rankine - correct answer °R = °F + 460
Celsius to Kelvin - correct answer K = °C +273.15
Charles' First Law - correct answer Volume1 / Pressure1 = Volume2 / Pressure2
Charles' Second Law - correct answer Pressure1 / Temperature1 = Pressure2 /
Temperature2
Boyle's Law - correct answer Pressure1 x Volume1 = Pressure2 x Volume2
General Gas Law - correct answer (Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2
Formula for Levers - correct answer Resistance x DistanceR = Effort x DistanceE
Formula for Inclined Planes - correct answer Force x Length = Resistance x Height
Formula for Wheel & Axel - correct answer Force x DistanceF = Resistance x
DistanceR
Torque - correct answer Force x Radius
Safe Working Pressure of a Riveted Boiler (SWP) - correct answer (Area of
Staybolt x Stress Constant of Staybolt) ÷ Area Covered by Staybolt or = (a x C) ÷ A
Area Covered by Staybolt - correct answer = Pitch x Pitch
Longitudinal Stress - correct answer (P x D x L) / 2t
P = Pressure
D = Diameter
L = Length
t = thickness of steel
Boiler Heating Surface (tubes) = - correct answer = C x L x #
, DC Boiler Exam Prep 2024/25 exam questions with complete
solution
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 - correct answer 746 Watts
Horsepower formula - correct answer = ft-lb/min ÷ 33000 ft-lb/min
ft-lb formula for a pump - correct answer = gpm x 8.33 x head (ft)
Factor of Evaporation (FE) = - correct answer = [Hs - (tfw-32)] ÷ 970.3
Hs = Enthalpy of steam
tfw = temperature of feed water
Latent Heat of Vaporization for Water - correct answer 970.3 Btu/lb
Latent Heat of Fusion for Water - correct answer 144 Btu/lb
1 Boiler Horsepower = x lbs of steam generator per hour - correct answer 34.5
lbs/hr
1 Boiler Horsepower = x Btu/hr - correct answer 33,475 Btu/hr
1 BHP = x ft² of heating surface (general) - correct answer 10 ft² heating surface
Volume of water increases by x percent when it flashes to steam - correct answer
x 1600
Thermal Efficiency (TE) = - correct answer = Lbs Steam per hour [Hs -(fwt° -32)] ÷
Units of Fuel per hour x Btu content per unit of fuel
Hs = Btu content of steam
fwt = feed water temperature
Developed Boiler Horsepower (DBHP) = - correct answer = (Pounds of Steam per
hour (Ws) x FE) ÷ 34.5
Ws = Lbs of steam per hour
FE = Factor of Evaporation
Maximum Allowable Working Pressure (MAWP) - correct answer = (TS x t x E) / FS
xr
TS = Tensile Strength of steel
t = thickness of steel
E = Efficiency of joint
FS = Factor of Safety
r = radius of boiler drum
Bursting Pressure (BP) - correct answer = (TS x t x E) / r
TS = Tensile Strength of steel
t = thickness of boiler plate
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