Fire Protection Hydraulics Driver/Op
CHP. 7 - Mathematics for the
Driver/Operator Exam Questions And
Answers
Using the hand method of calculation, calculate the pump
discharge pressure for 200 ft (60 m) of 2½-inch (64-mm) hose
flowing 250 gallons/min (950 L/min) through a fog nozzle up a hill
with an elevation of 40 ft (12 m). -
correct answer ✅145 psi (1015 kPa)
Using the subtract 10 method, calculate the pump discharge
pressure for 300 ft (90 m) of 2½-inch (64-mm) hose with a 1-inch
(25-mm) smooth-bore tip flowing 200 gallons/min (750 L/min) with
a nozzle pressure of 50 psi (345 kPa). -
correct answer ✅74 psi (518 kPa)
Friction loss is measured in: -
correct answer ✅psi or kPa
Using the Q formula, calculate the pump discharge pressure for
Engine 1, which is on a hydrant and is supplying 600 ft (183 m) of 5-
inch (127-mm) hose to Engine 2, which is pumping 1200
gallons/min (4543 L/min). -
correct answer ✅90 psi (630kPa)
, Fire Protection Hydraulics Driver/Op
CHP. 7 - Mathematics for the
Driver/Operator Exam Questions And
Answers
Determine how many additional lines can be opened when the
hydrant static pressure on the pump intake gauge is 80 psi (560
kPa), the driver flows several attack lines with a total flow of 300
gallons/min (1135 L/min), and the residual pressure drops to 70 psi
(490 kPa). -
correct answer ✅Two
Lakes and streams require pulling a draft and are considered
_________ water sources. -
correct answer ✅static
What is the basic formula for determining pump discharge pressure
(PDP)? -
correct answer ✅PDP = NP + FL
To determine the head pressure, divide the height of the column in
feet by _______ (metric = height in meters divided by ______). -
correct answer ✅2.31; 9.812
CHP. 7 - Mathematics for the
Driver/Operator Exam Questions And
Answers
Using the hand method of calculation, calculate the pump
discharge pressure for 200 ft (60 m) of 2½-inch (64-mm) hose
flowing 250 gallons/min (950 L/min) through a fog nozzle up a hill
with an elevation of 40 ft (12 m). -
correct answer ✅145 psi (1015 kPa)
Using the subtract 10 method, calculate the pump discharge
pressure for 300 ft (90 m) of 2½-inch (64-mm) hose with a 1-inch
(25-mm) smooth-bore tip flowing 200 gallons/min (750 L/min) with
a nozzle pressure of 50 psi (345 kPa). -
correct answer ✅74 psi (518 kPa)
Friction loss is measured in: -
correct answer ✅psi or kPa
Using the Q formula, calculate the pump discharge pressure for
Engine 1, which is on a hydrant and is supplying 600 ft (183 m) of 5-
inch (127-mm) hose to Engine 2, which is pumping 1200
gallons/min (4543 L/min). -
correct answer ✅90 psi (630kPa)
, Fire Protection Hydraulics Driver/Op
CHP. 7 - Mathematics for the
Driver/Operator Exam Questions And
Answers
Determine how many additional lines can be opened when the
hydrant static pressure on the pump intake gauge is 80 psi (560
kPa), the driver flows several attack lines with a total flow of 300
gallons/min (1135 L/min), and the residual pressure drops to 70 psi
(490 kPa). -
correct answer ✅Two
Lakes and streams require pulling a draft and are considered
_________ water sources. -
correct answer ✅static
What is the basic formula for determining pump discharge pressure
(PDP)? -
correct answer ✅PDP = NP + FL
To determine the head pressure, divide the height of the column in
feet by _______ (metric = height in meters divided by ______). -
correct answer ✅2.31; 9.812
