DPO EXAM 2024
QUESTIONS WITH
100% CORRECT
ANSWERS, ALREADY
SCORED A+
DPO
Evatee 8/8/24 DPO
,DPO EXAM 2024 QUESTIONS WITH 100%
CORRECT ANSWERS, ALREADY SCORED A+
According to NFPA ________ some FD have a designated apparatus
maintenance officer who meets the requirements of an Emergency Vehicle
Tech. Answer - 1071
The part of the total pressure not used to overcome friction/gravity while
forcing water through fire hose, pipe, fittings, & adapters is known as Answer -
Residual Pressure
A hydrant w/ the LARGEST capacity will be one that is connected to a: Answer -
Primary Feeder
A fire hydrant w/ a green bonnet and cap will flow ___ GPM Answer - 1,000 -
1,499
A one square-inch column contains water to a height of 100 ft. What is the
pressure in psi at the base of the column? Answer - 43.4
________ pressure is the difference between the pump discharge pressure &
incoming pressure from the hydrant. Answer - Net pump discharge
Friction loss is USUALLY expressed in terms of: Answer - Pounds per square
inch per 100 ft of hose
A good method for determining lift in a FD pump is that for each ______ of
indicated vacuum, water will rise ______. Answer - Inch, one foot
,The recommended nozzle pressure for 2.5 inch handlines with solid bore tips is
____ psi. Answer - 50
The recommended nozzle pressure for solid bore master streams 2 inches or
less is ____ psi Answer - 80
The recommended pressure for fog nozzle (all types) is ___ psi. Answer - 100
When the flow through a hose line increases from 100 rpm to 400 rpm, the
friction loss increases ____ times. Answer - 16
The pressure created by a column of water due to elevation is known as ____
pressure. Answer - head
Nozzle reaction is explained by the law of physics that states: Answer - For
every action there is an equal & opposite reaction.
A ______ is used to find the flow pressure at a discharge opening. Answer -
Pitot tube & gauge
Theoretically, the maximum distance a pump can lift water @ sea level is _____
feet. Answer - 33.8
The recommended method of determining the exact friction loss of any
appliance is to: Answer - Run tests w/ each appliance used by the dept.
Which of the following formulas is used to determine the area of a circle?
Answer - (pie)r^2
, Excessive engine temperature during pumping operations can be controlled by
using the: Answer - Auxiliary cooler
The water level of a reservoir is 150 ft above a hydrant. What is the static
reading @ the hydrant? Answer - 65.1 psi
Two 1.75inch hose lines are being used. Each line is delivering 150gpm. Supply
is from the 750 gallon capacity booster tank on apparatus. How many minutes
will the booster tank be able to supply to both lines w/o being refilled? Answer
- 2.5 minutes
In an auxiliary cooling system, heat is transferred from the engine cooling water
to the: Answer - pump water
A ________ indicates flow in gallons per minute. Answer - Flow meter
A straight stream is considered: Answer - a pattern of an adjustable fog nozzle
An operator obtains a reading of 17 inches of mercury on the intake gauge
while drafting and flowing water. This indicates: Answer - A lift of
approximately 17 feet.
Prior to changing from the tank water to an external source: Answer - Make
sure all air is bled from the intake.
The driver/operator has set the apparatus up for the pumping operation. If the
tachometer shows an RPM reading, but the speedometer does NOT, it could
indicate that the: Answer - A & B are correct -- Transmission is in the wrong
gear & transmission is NOT engaged.
QUESTIONS WITH
100% CORRECT
ANSWERS, ALREADY
SCORED A+
DPO
Evatee 8/8/24 DPO
,DPO EXAM 2024 QUESTIONS WITH 100%
CORRECT ANSWERS, ALREADY SCORED A+
According to NFPA ________ some FD have a designated apparatus
maintenance officer who meets the requirements of an Emergency Vehicle
Tech. Answer - 1071
The part of the total pressure not used to overcome friction/gravity while
forcing water through fire hose, pipe, fittings, & adapters is known as Answer -
Residual Pressure
A hydrant w/ the LARGEST capacity will be one that is connected to a: Answer -
Primary Feeder
A fire hydrant w/ a green bonnet and cap will flow ___ GPM Answer - 1,000 -
1,499
A one square-inch column contains water to a height of 100 ft. What is the
pressure in psi at the base of the column? Answer - 43.4
________ pressure is the difference between the pump discharge pressure &
incoming pressure from the hydrant. Answer - Net pump discharge
Friction loss is USUALLY expressed in terms of: Answer - Pounds per square
inch per 100 ft of hose
A good method for determining lift in a FD pump is that for each ______ of
indicated vacuum, water will rise ______. Answer - Inch, one foot
,The recommended nozzle pressure for 2.5 inch handlines with solid bore tips is
____ psi. Answer - 50
The recommended nozzle pressure for solid bore master streams 2 inches or
less is ____ psi Answer - 80
The recommended pressure for fog nozzle (all types) is ___ psi. Answer - 100
When the flow through a hose line increases from 100 rpm to 400 rpm, the
friction loss increases ____ times. Answer - 16
The pressure created by a column of water due to elevation is known as ____
pressure. Answer - head
Nozzle reaction is explained by the law of physics that states: Answer - For
every action there is an equal & opposite reaction.
A ______ is used to find the flow pressure at a discharge opening. Answer -
Pitot tube & gauge
Theoretically, the maximum distance a pump can lift water @ sea level is _____
feet. Answer - 33.8
The recommended method of determining the exact friction loss of any
appliance is to: Answer - Run tests w/ each appliance used by the dept.
Which of the following formulas is used to determine the area of a circle?
Answer - (pie)r^2
, Excessive engine temperature during pumping operations can be controlled by
using the: Answer - Auxiliary cooler
The water level of a reservoir is 150 ft above a hydrant. What is the static
reading @ the hydrant? Answer - 65.1 psi
Two 1.75inch hose lines are being used. Each line is delivering 150gpm. Supply
is from the 750 gallon capacity booster tank on apparatus. How many minutes
will the booster tank be able to supply to both lines w/o being refilled? Answer
- 2.5 minutes
In an auxiliary cooling system, heat is transferred from the engine cooling water
to the: Answer - pump water
A ________ indicates flow in gallons per minute. Answer - Flow meter
A straight stream is considered: Answer - a pattern of an adjustable fog nozzle
An operator obtains a reading of 17 inches of mercury on the intake gauge
while drafting and flowing water. This indicates: Answer - A lift of
approximately 17 feet.
Prior to changing from the tank water to an external source: Answer - Make
sure all air is bled from the intake.
The driver/operator has set the apparatus up for the pumping operation. If the
tachometer shows an RPM reading, but the speedometer does NOT, it could
indicate that the: Answer - A & B are correct -- Transmission is in the wrong
gear & transmission is NOT engaged.
