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202-10 Basic Hydraulics

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Questions and Answers

Which is the primary suppression agent used by the fire service?

Carbon dioxide

Foam

Water (correct)

Dry chemical

What is the weight of a 50' fully charged 1 ¾" Firequip Combat Master Flow hose line?

7.21 gallons

60.17 pounds

80 pounds (correct)

28.84 gallons

How much water is required to fill a supply and attack line consisting of 4 lengths of 3" hose and 3 lengths of 1 ¾" hose?

95.07 gallons (correct)

100 gallons

73.44 gallons

21.63 gallons

What is the weight of a 100' charged 5" LDH hose line?

851 lbs Signup and view all the answers

What is friction loss?

The amount of energy lost by water travelling through hose Signup and view all the answers

Which field of science is hydraulics rooted in?

Physics Signup and view all the answers

What is the physical science of the properties of a liquid at rest or in motion called?

Hydrodynamics Signup and view all the answers

What is the foundation of efficient water supply and pumping operations?

Understanding basic hydraulic theories and principles Signup and view all the answers

What should pump operators be able to perform at an emergency?

Street math Signup and view all the answers

What are the negative effects of an over-pressurized line?

Fatigue for the nozzle firefighter Signup and view all the answers

Which equation can be used to calculate the pump discharge pressure (PDP)?

PDP = NP + FL + SA + EL Signup and view all the answers

What is the friction loss per 50 feet of a 1 ¾" hose line with a flow rate of 185 GPM?

17 PSI Signup and view all the answers

What is the working limit for firefighters managing nozzle reaction force?

95 lbs. Signup and view all the answers

Which gauge should be used to determine nozzle pressure for smooth bore nozzles?

Pitot gauge Signup and view all the answers

What is the target flow?

The GPM amount that a DPOP aims to achieve through proper Pump Discharge Pressure Signup and view all the answers

Which equation represents the Pump Discharge Pressure (PDP)?

PDP = NP + FL + AL + L +/- E Signup and view all the answers

What is the maximum flow rate of a 2 ½" hose line with a 1 1/8" tip?

265 GPM Signup and view all the answers

What is the minimum information needed to determine the correct Pump Discharge Pressure (PDP)?

Nozzle Pressure (NP) and Friction Loss (FL) Signup and view all the answers

When should a 2 ½" hose line be used?

For occupancies and fire loads that demand higher GPMs Signup and view all the answers

What is the equation to calculate the Pump Discharge Pressure (PDP)?