TCFP DRIVER OP ANSWERS AND QUESTIONS SET A+
✔✔________________ refers to the pressure required at the nozzle to deliver the fire
stream and flow rate for which the nozzle was designed. - ✔✔Nozzle pressure
✔✔What term describes an exact method of hydraulic calculations. - ✔✔Theoretical
Hydraulics
✔✔Using the subtract 10 method, calculate the pump discharge pressure for 300 ft of
2.5 inch hose with a 1 inch smooth bore tip flowing 200 gallons/ min with a nozzle
pressure of 50 psi. - ✔✔145 psi
✔✔Using the subtract 10 method, calculate the pump discharge pressure for 300ft of
2.5 inch hose with a 1-inch smooth-bore tip flowing 200 gallons/ min with a nozzle
pressure of 50 psi. - ✔✔74 psi
✔✔True or false? The most useful tool in a fire incident is knowledge of the target
structure and a well- developed preincident plan. - ✔✔True
✔✔Which of the following is NOT one of the four laws governing how friction loss
behaves? - ✔✔Provide all conditions are equal, friction loss will vary in direct proportion
to the diameter of the hose.
✔✔Which of the following formulas is used to determine nozzle reaction in smooth-bore
nozzles? - ✔✔NR= 1.57 x D² x NP
✔✔What is the correct formula used for calculating friction loss in its simplest form? -
✔✔FL= C x Q²x L
✔✔Which of the following does NOT influence pump calculations? - ✔✔Pump type
, ✔✔Which of the following refers to the study of the characteristics and movement of
water as it pertains to calculations for fire streams and fireground operations. -
✔✔Hydraulics
✔✔Lakes and streams require pulling a draft and are considered _______________
water source. - ✔✔Static
✔✔To determine the head pressure, divide the height of the column in feet by
_________ (metric = height in meters divided by ___________). - ✔✔2.31; 9.812
✔✔What is the term for opening a discharge just enough to deliver the desired pressure
when operating multiple lines with different required pressures? - ✔✔Gating a valve
✔✔Determine how many additional lines can be opened when the hydrant static
pressure on the pump intake gauge is 80 psi, the driver flows several attack lines with a
total flow of 300 gallons/ min and the residual pressure drops to 70 psi. - ✔✔Two
✔✔Scientific or more exact fireground calculations - ✔✔Theoretical hydraulics
✔✔The essential flow, measured in gallons per minute, that is needed to overcome the
heat generated by fire. - ✔✔Critical rate of flow
✔✔Simpler, quicker methods for performing hydraulic calculations. - ✔✔Fireground
hydraulics
✔✔The amount of pressure created by the pump after receiving pressure from a
hydrant or another pump. - ✔✔Net pump discharge pressure
✔✔The pressure measured at the pump discharge needed to overcome friction and
elevation loss while maintaining the desired nozzle pressure and delivering an adequate
fire stream. - ✔✔Pump Discharge Pressure (PDP)
✔✔Using the Q formula, calculate the pump discharge pressure for Engine 1, which is
on a hydrant and is supplying 600 ft of 5-inch hose to Engine 2, which is pumping 1200
gallons/ min. - ✔✔90 psi
✔✔____________ is pressure gained when the nozzle is below the pump. -
✔✔Elevation gain
✔✔What term refers to the sufficient flow applied to overcome the heat generated by
the fire. - ✔✔Critical rate of flow
✔✔What is the elevation pressure when the nozzle is on the 11th floor? - ✔✔50 psi
✔✔________________ refers to the pressure required at the nozzle to deliver the fire
stream and flow rate for which the nozzle was designed. - ✔✔Nozzle pressure
✔✔What term describes an exact method of hydraulic calculations. - ✔✔Theoretical
Hydraulics
✔✔Using the subtract 10 method, calculate the pump discharge pressure for 300 ft of
2.5 inch hose with a 1 inch smooth bore tip flowing 200 gallons/ min with a nozzle
pressure of 50 psi. - ✔✔145 psi
✔✔Using the subtract 10 method, calculate the pump discharge pressure for 300ft of
2.5 inch hose with a 1-inch smooth-bore tip flowing 200 gallons/ min with a nozzle
pressure of 50 psi. - ✔✔74 psi
✔✔True or false? The most useful tool in a fire incident is knowledge of the target
structure and a well- developed preincident plan. - ✔✔True
✔✔Which of the following is NOT one of the four laws governing how friction loss
behaves? - ✔✔Provide all conditions are equal, friction loss will vary in direct proportion
to the diameter of the hose.
✔✔Which of the following formulas is used to determine nozzle reaction in smooth-bore
nozzles? - ✔✔NR= 1.57 x D² x NP
✔✔What is the correct formula used for calculating friction loss in its simplest form? -
✔✔FL= C x Q²x L
✔✔Which of the following does NOT influence pump calculations? - ✔✔Pump type
, ✔✔Which of the following refers to the study of the characteristics and movement of
water as it pertains to calculations for fire streams and fireground operations. -
✔✔Hydraulics
✔✔Lakes and streams require pulling a draft and are considered _______________
water source. - ✔✔Static
✔✔To determine the head pressure, divide the height of the column in feet by
_________ (metric = height in meters divided by ___________). - ✔✔2.31; 9.812
✔✔What is the term for opening a discharge just enough to deliver the desired pressure
when operating multiple lines with different required pressures? - ✔✔Gating a valve
✔✔Determine how many additional lines can be opened when the hydrant static
pressure on the pump intake gauge is 80 psi, the driver flows several attack lines with a
total flow of 300 gallons/ min and the residual pressure drops to 70 psi. - ✔✔Two
✔✔Scientific or more exact fireground calculations - ✔✔Theoretical hydraulics
✔✔The essential flow, measured in gallons per minute, that is needed to overcome the
heat generated by fire. - ✔✔Critical rate of flow
✔✔Simpler, quicker methods for performing hydraulic calculations. - ✔✔Fireground
hydraulics
✔✔The amount of pressure created by the pump after receiving pressure from a
hydrant or another pump. - ✔✔Net pump discharge pressure
✔✔The pressure measured at the pump discharge needed to overcome friction and
elevation loss while maintaining the desired nozzle pressure and delivering an adequate
fire stream. - ✔✔Pump Discharge Pressure (PDP)
✔✔Using the Q formula, calculate the pump discharge pressure for Engine 1, which is
on a hydrant and is supplying 600 ft of 5-inch hose to Engine 2, which is pumping 1200
gallons/ min. - ✔✔90 psi
✔✔____________ is pressure gained when the nozzle is below the pump. -
✔✔Elevation gain
✔✔What term refers to the sufficient flow applied to overcome the heat generated by
the fire. - ✔✔Critical rate of flow
✔✔What is the elevation pressure when the nozzle is on the 11th floor? - ✔✔50 psi
