1
Support Operations PH II Pre Exam Study Guide
SPO Phase 1 Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
TABLE OF CONTENTS - OFFICIAL SECTIONS:
Section
Questions
Section 1: Water Supply & Hydraulics 1-8
Section 2: Apparatus Operation & Safety 9-16
Section 3: Support Operations & Scene Management 17-24
Section 4: Emergency Communications & Accountability 25-32
[SECTION 1: Water Supply & Hydraulics — Questions 1-8]
Q1: During a relay pumping operation, the engine company acting as the water source is
supplying water to a pumper 1,000 feet away using 3-inch hose. If the source pumper is
discharging 300 GPM and the receiving pumper requires 20 PSI residual pressure at the intake,
which of the following discharge pressures is most appropriate for the source pumper, assuming
a friction loss of 5 PSI per 100 feet of 3-inch hose at this flow?
A. 40 PSI
B. 50 PSI
C. 70 PSI [CORRECT]
D. 100 PSI
Correct Answer: C
Rationale: To calculate the required discharge pressure, you must add the total friction loss to the
required intake pressure. The friction loss is 5 PSI per 100 feet × 10 (1,000 feet) = 50 PSI.
,2
Adding the required 20 PSI intake pressure results in 70 PSI. Option A is insufficient to
overcome friction loss, while Option D is excessive and risks rupturing the supply line or
damaging the receiving pump's intake valves.
Q2: When calculating the required Pump Discharge Pressure (PDP) for a handline, the officer
uses the formula: PDP = NP + FL + Elevation. If a 2.5-inch hoseline is flowing 250 GPM with a
50-psi nozzle, and the nozzle is on a roof that is 30 feet above the pump, what is the PDP?
(Assume FL = 15 PSI).
A. 65 PSI
B. 80 PSI
C. 95 PSI [CORRECT]
D. 110 PSI
Correct Answer: C
Rationale: The calculation is NP (50) + FL (15) + Elevation (30 feet ÷ 2 = 15 PSI back pressure)
= 80 PSI + 15 PSI = 95 PSI. Elevation adds 0.5 PSI of back pressure for every foot of lift, so 30
feet adds 15 PSI. Option B omits the elevation component, while Option D overestimates the
friction loss or elevation pressure.
Q3: An engineer is attempting to establish a water supply from a static source, such as a pond,
using a hard suction sleeve. According to hydraulic principles and NFPA 1002 standards, what is
the maximum theoretical height that a centrifugal pump can lift water at sea level under perfect
conditions?
A. 14.7 feet
B. 22 feet
C. 33.9 feet [CORRECT]
D. 45 feet
Correct Answer: C
Rationale: Atmospheric pressure at sea level is 14.7 PSI, which is equivalent to supporting a
column of water approximately 33.9 feet high. However, due to friction loss in the hose and
, 3
fittings, and the fact that pumps cannot create a perfect vacuum, the practical lift limit is
generally considered to be around 20 to 25 feet. Option A is the atmospheric pressure in PSI, not
feet of head, and Option B is a common practical limit rather than the theoretical maximum.
Q4: Which of the following best describes the function of a "relay valve" (or "water thief") used
in large-scale water supply operations?
A. It acts as a check valve to prevent backflow from a higher-pressure pump into a lower-
pressure pump.
B. It allows a single large-diameter supply line to feed multiple attack lines or smaller supply
lines. [CORRECT]
C. It automatically bypasses the pump panel to send tank water directly to the discharge
manifold.
D. It regulates the pressure of the incoming water supply to prevent over-pressurization of the
pump.
Correct Answer: B
Rationale: A relay valve, often gated, allows an engine company to take a large volume of water
from a relay supply line and split it to feed multiple handlines or to supply other apparatus,
effectively acting as a manifold. Option A describes a clapper valve or check valve found in the
pump manifold. Option D describes a pressure relief valve or governor function.
Q5: A pumper is supplying a ladder pipe flowing 1,000 GPM through a 4-inch hose line 400 feet
in length. Using the standard friction loss formula for 4-inch hose (roughly 5 PSI per 100 feet at
1,000 GPM), and assuming the ladder pipe requires 100 PSI at the base, what is the required
engine discharge pressure?
A. 100 PSI
B. 120 PSI [CORRECT]
C. 140 PSI
D. 160 PSI
Correct Answer: B
Support Operations PH II Pre Exam Study Guide
SPO Phase 1 Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
TABLE OF CONTENTS - OFFICIAL SECTIONS:
Section
Questions
Section 1: Water Supply & Hydraulics 1-8
Section 2: Apparatus Operation & Safety 9-16
Section 3: Support Operations & Scene Management 17-24
Section 4: Emergency Communications & Accountability 25-32
[SECTION 1: Water Supply & Hydraulics — Questions 1-8]
Q1: During a relay pumping operation, the engine company acting as the water source is
supplying water to a pumper 1,000 feet away using 3-inch hose. If the source pumper is
discharging 300 GPM and the receiving pumper requires 20 PSI residual pressure at the intake,
which of the following discharge pressures is most appropriate for the source pumper, assuming
a friction loss of 5 PSI per 100 feet of 3-inch hose at this flow?
A. 40 PSI
B. 50 PSI
C. 70 PSI [CORRECT]
D. 100 PSI
Correct Answer: C
Rationale: To calculate the required discharge pressure, you must add the total friction loss to the
required intake pressure. The friction loss is 5 PSI per 100 feet × 10 (1,000 feet) = 50 PSI.
,2
Adding the required 20 PSI intake pressure results in 70 PSI. Option A is insufficient to
overcome friction loss, while Option D is excessive and risks rupturing the supply line or
damaging the receiving pump's intake valves.
Q2: When calculating the required Pump Discharge Pressure (PDP) for a handline, the officer
uses the formula: PDP = NP + FL + Elevation. If a 2.5-inch hoseline is flowing 250 GPM with a
50-psi nozzle, and the nozzle is on a roof that is 30 feet above the pump, what is the PDP?
(Assume FL = 15 PSI).
A. 65 PSI
B. 80 PSI
C. 95 PSI [CORRECT]
D. 110 PSI
Correct Answer: C
Rationale: The calculation is NP (50) + FL (15) + Elevation (30 feet ÷ 2 = 15 PSI back pressure)
= 80 PSI + 15 PSI = 95 PSI. Elevation adds 0.5 PSI of back pressure for every foot of lift, so 30
feet adds 15 PSI. Option B omits the elevation component, while Option D overestimates the
friction loss or elevation pressure.
Q3: An engineer is attempting to establish a water supply from a static source, such as a pond,
using a hard suction sleeve. According to hydraulic principles and NFPA 1002 standards, what is
the maximum theoretical height that a centrifugal pump can lift water at sea level under perfect
conditions?
A. 14.7 feet
B. 22 feet
C. 33.9 feet [CORRECT]
D. 45 feet
Correct Answer: C
Rationale: Atmospheric pressure at sea level is 14.7 PSI, which is equivalent to supporting a
column of water approximately 33.9 feet high. However, due to friction loss in the hose and
, 3
fittings, and the fact that pumps cannot create a perfect vacuum, the practical lift limit is
generally considered to be around 20 to 25 feet. Option A is the atmospheric pressure in PSI, not
feet of head, and Option B is a common practical limit rather than the theoretical maximum.
Q4: Which of the following best describes the function of a "relay valve" (or "water thief") used
in large-scale water supply operations?
A. It acts as a check valve to prevent backflow from a higher-pressure pump into a lower-
pressure pump.
B. It allows a single large-diameter supply line to feed multiple attack lines or smaller supply
lines. [CORRECT]
C. It automatically bypasses the pump panel to send tank water directly to the discharge
manifold.
D. It regulates the pressure of the incoming water supply to prevent over-pressurization of the
pump.
Correct Answer: B
Rationale: A relay valve, often gated, allows an engine company to take a large volume of water
from a relay supply line and split it to feed multiple handlines or to supply other apparatus,
effectively acting as a manifold. Option A describes a clapper valve or check valve found in the
pump manifold. Option D describes a pressure relief valve or governor function.
Q5: A pumper is supplying a ladder pipe flowing 1,000 GPM through a 4-inch hose line 400 feet
in length. Using the standard friction loss formula for 4-inch hose (roughly 5 PSI per 100 feet at
1,000 GPM), and assuming the ladder pipe requires 100 PSI at the base, what is the required
engine discharge pressure?
A. 100 PSI
B. 120 PSI [CORRECT]
C. 140 PSI
D. 160 PSI
Correct Answer: B
