DC BOILER EXAM PREP - SOLUTIONS. Area of a rectangle - correct answer...

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DC BOILER EXAM PREP

ACTUAL EXAM WITH CORRECT

SOLUTIONS.

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

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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 2 / 4

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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 3 / 4

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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 # C = Circumference of tubes

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