Pumps

Question 1

The Ladder Pipe Assembly consists of ?

Answer 1

Ladder Pipe, a single 100’ section of 3” hose, and a Siamese or Trimese

Question 2

Dual Pump Operation

Answer 2

The use of a second engine company at a hydrant, making connection
to the intake of the first engine company without shutting down the operation of the first engine company. This should only be performed on blue band hydrants (1500 GPM or greater)

Question 3

What is Net Pump Pressure?

Answer 3

The difference between an engine’s intake pressure and discharge
pressure.

Question 4

What is lift? In terms of Drafting

Answer 4

The height in feet that a pump is located above the surface of a body of water, as in a draft operation. Maximum lift for a pump in excellent condition is 28 feet. A pump in average or good condition is about 26 feet.

Question 5

What is a Source Engine ?

Answer 5

The engine company positioned at a hydrant or other source of water that is
responsible for supplying the attack engine. Most often the 3rd & 4th due engine company.

Question 6

What is Relay Pumping?

Answer 6

3 or more engine companies used to move water over longer distances

Question 7

Chapter I
What is Pascal’s Law, framed by Blaise Pascal, states that

Answer 7

Pressure applied to any part of a confined fluid transmits to every other part with no loss. The pressure acts with equal force on all areas of the confining walls and perpendicular to the walls

Question 8

Chapter I

The weight of water varies according to its temperature and mineral content, but the figure most popularly chosen, and the one we will use to represent the approximate weight of a cubic foot of water, is ?

Answer 8

62.5 pounds

Question 9

Chapter I

The following terms are used to measure the movement of water:

Answer 9

1:Flow is used to indicate that quantity of liquid which will pass a given point in a given unit of time.
2:Gallons Per Minute (GPM) is the usual way of expressing volume of flow.
3: Velocity of Flow means the rate of speed at which the liquid is moving in relation to some fixed point. The term feet per second is the usual way of expressing velocity of flow. The term volume and velocity are often considered jointly

Question 10

Chapter I

There are two categories within the broad classification of friction loss:

Answer 10

(1) friction loss which occurs due to the motion of a liquid
along a smooth or rough surface
(2) eddy loss, which occurs at relatively abrupt changes in flow. Abrupt changes can occur at a valve, direction change, or at a sudden enlargement of a channel

Question 11

Chapter 1

The weight is known as atmospheric pressure and exerts _____ PSI at sea level

Answer 11

The weight is known as atmospheric
pressure and exerts 14.7 PSI at sea level

Question 12

Chapter 1

Device used to measure velocity and pressure heads present
within a flowing stream.

Answer 12

The Pitot tube is a device used to measure velocity and pressure heads present within a flowing stream.

Question 13

Chapter 1

The compact size and sturdiness of the _________ gauges makes them a more practical choice for this application, and the fire service uses this type of gauge on most fire apparatus.

Answer 13

The compact size and sturdiness of the Bourdon gauges makes them a more practical choice for this application, and the fire service uses this type of gauge on most fire apparatus.

Question 14

Chapter 1:

A pump in excellent condition can cause enough vacuum so that atmospheric pressure can force water about __ feet. A pump in average to good condition can cause enough vacuum so that atmospheric pressure can force water about ___ feet.

Answer 14

A pump in excellent condition can cause enough vacuum so that atmospheric pressure can force water about 28 feet. A pump in average to good condition can cause enough vacuum so that atmospheric pressure can force water about 26 feet.

Question 15

Chapter I

The range of a firefighting stream is dependent upon four factors:

Answer 15

nozzle pressure, nozzle diameter, angle of inclination above the horizontal plane and wind speed/direction

Question 16

Chapter I

Of these three stream factors,___________ has the most important bearing

Answer 16

nozzle pressure

Question 17

Chapter II

A _________ displacement pump discharges a definite volume of liquid or gas in each cycle of pump operation

Answer 17

A positive displacement pump discharges a definite volume of liquid or gas in each cycle of pump operation

Question 18

Chapter II

A _____________displacement pump in operation discharges a volume of liquid in each cycle of operation which is dependent upon the resistance offered to the movement of the liquid being pumped.

Answer 18

A non-positive displacement pump in operation discharges a volume of liquid in each cycle of operation which is dependent upon the resistance offered to the movement of the liquid being pumped.

Question 19

Chapter II

One type of non-positive displacement pump applies an action to liquids by rotating them in such a manner as to achieve a centrifugal force (the force tending to make rotating bodies move away from the center of rotation). This type of pump is referred to as a ____________

Answer 19

One type of non-positive displacement pump applies an action to liquids by rotating them in such a manner as to achieve a centrifugal force (the force tending to make rotating bodies move away from the center of rotation). This type of pump is referred to as a “centrifugal pump.”

Question 20

Chapter II

There are vanes located between the two sides of the impeller which play an important part in the design of the impeller. These vanes prevent _______ of the water,

Answer 20

There are vanes located between the two sides of the impeller which play an important part in the design of the impeller. These vanes prevent eddying of the water,

Question 21

Chapter II

Most pump impellers rotate approximately at a ____ ratio to the engine speed

Answer 21

Most pump impellers rotate approximately at a (2:1) ratio to the engine speed

Question 22

Chapter II

When making the pump ready, the transfer valve should be placed in _______ stage. Operate the transfer valve ______ to ensure its reliability

Answer 22

When making the pump ready, the transfer valve should be placed in pressure stage. Operate the transfer valve daily to ensure its reliability

Question 23

Chapter II

If pumping is already in progress and it becomes necessary to change from pressure stage to volume stage, or vice-versa, the pump pressure should be reduced to within ___PSI of the pump intake pressure

Answer 23

50 psi

Question 24

Chapter II

When you are discharging volumes greater than or equal to __% of the
pumps capacity

Answer 24

70%

Question 25

Chapter II The single-stage pumps in the District of Columbia Fire Department are rated at _____ gallons per minute, at ___ PSI

Answer 25

The single-stage pumps in the District of Columbia Fire Department are rated at 2000 gallons per minute, at 150 PSI

Question 26

Chapter II The Department’s maximum discharge pressure is __ PSI.

Answer 26

300 psi

Question 27

Chapter II True or False? The impeller on a centrifugal pump will not pump air alone, so the centrifugal pump cannot prime itself.

Answer 27

True The impeller on a centrifugal pump will not pump air alone, so the centrifugal pump cannot prime itself.

Question 28

Chapter II All of our engines are equipped with intake relief valves. These intake relief valves are set at ___ PSI and will discharge water on the ground when the set intake pressure is exceeded

Answer 28

150 psi

Question 29

Chapter II Each intake relief valve has a _______NST connection. A. 2 1/2” female B. 2 1/2” male C. 3” female D. 3” male

Answer 29

B. Each valve has a 2 ½” male NST connection.

Question 30

Chapter III Any time we begin to calculate the engine pressure formula it will be in the pump operator’s best interest to always start at the ________ end of the equation

Answer 30

Any time we begin to calculate the engine pressure formula it will be in the pump operator’s best interest to always start at the discharge end of the equation

Question 31

Chapter III It has been determined that when there are two or more pumpers in line, an allowance of __ pounds for this intake pressure is suitable

Answer 31

It has been determined that when there are two or more pumpers in line, an allowance of 20 pounds for this intake pressure is suitable

Question 32

Chapter III LADDER PIPE ASSEMBLY (SIAMESE, 100FT 3” HOSE, LADDER PIPE). 1 ½” Tip =___PSI 1 ¾” Tip =___PSI

Answer 32

LADDER PIPE ASSEMBLY (SIAMESE, 100FT 3” HOSE, LADDER PIPE) 1 ½” Tip – 30 PSI 1 ¾” Tip – 45 PSI

Question 33

Chapter III ENGINE PRESSURE FOR SPRINKLER SYSTEMS Use ____ PSI for the engine pressure unless otherwise ordered

Answer 33

ENGINE PRESSURE FOR SPRINKLER SYSTEMS Use 125 PSI for the engine pressure unless otherwise ordered

Question 34

Chapter III ENGINE PRESSURE FOR COMBINATION SPRINKLER / STANDPIPE SYSTEMS Use ___ PSI for the engine pressure. This accounts for the friction loss in the connection; standpipe riser; and 200’ of 1 ½” hose with a 125GPM / 75PSI nozzle – as well as the sprinkler system. You must add or subtract elevation.

Answer 34

ENGINE PRESSURE FOR COMBINATION SPRINKLER / STANDPIPE SYSTEMS Use 160 PSI for the engine pressure. This accounts for the friction loss in the connection; standpipe riser; and 200’ of 1 ½” hose with a 125GPM / 75PSI nozzle – as well as the sprinkler system. You must add or subtract elevation.

Question 35

Chapter III To function properly in the foam position, the eductor requires a flow of at least __ GPM. Nozzles which deliver less than __ GPM cannot be used with the eductor in the foam position. When the eductor is used in foam position, the pressure at the eductor should be __PSI and the length of 1½” line limited to ____ feet

Answer 35

To function properly in the foam position, the eductor requires a flow of at least 95 GPM. Nozzles which deliver less than 95 GPM cannot be used with the eductor in the foam position. When the eductor is used in foam position, the pressure at the eductor should be 200 PSI and the length of 1½” line limited to 200

Question 36

Chapter III ENGINE PRESSURE FOR TUNNEL/STATION STANDPIPE SYSTEMS The exhauster may take up to ___ to ___minutes to fully expel the trapped air in the system as they are being filled with water

Answer 36

The exhauster may take up to five to fifteen minutes to fully expel the trapped air in the system as they are being filled with water

Question 37

Chapter IV Most of the fireground operational procedures are based on the utilization of ___ vehicles

Answer 37

Most of the fireground operational procedures are based on the utilization of two vehicles

Question 38

Chapter IV ENGAGING/DISENGAGING THE PUMP Ensure that the pump went into gear by observing that the gear selector went to ______ gear; that there are two green lights illuminated; and that the speedometer increased to approximately __ MPH

Answer 38

Ensure that the pump went into gear by observing that the gear selector went to fourth gear; that there are two green lights illuminated; and that the speedometer increased to approximately 15 MPH

Question 39

Chapter IV The following steps are to be taken to disengage the pump. 1. Utilize the pressure sensing governor at the pump panel to return the speed of the motor to an idle – approximately ____RPM – by reducing the discharge pressure and then pressing the ‘idle’ button

Answer 39

The following steps are to be taken to disengage the pump. 1. Utilize the pressure sensing governor at the pump panel to return the speed of the motor to an idle – approximately 700 RPM – by reducing the discharge pressure and then pressing the ‘idle’ button

Question 40

Chapter IV What is the first step? After establishing a water supply and positioning the wagon, the pump operator shall:

Answer 40

1. Place the pump in pump gear 2. Exit the cab and set the wheelchocks 3. Ensure that the pump is ‘ready to pump’ 4. Charge the attack line to the appropriate pressure

Question 41

Chapter IV SOURCE ENGINE After positioning the pumper at the hydrant, the pump operator shall: what is your first step?

Answer 41

1. Exit the cab a. Set the wheelchocks b. Flush the hydrant if there is no Humat valve attached to the hydrant c. If Humat valve is in place move to step 2

Question 42

Chapter IV DRAFTING When positioning apparatus to operate from draft, the most desirable intakes to utilize are those on the _____. The priming time required is the least and the pump capacity is the greatest when using those intakes

Answer 42

When positioning apparatus to operate from draft, the most desirable intakes to utilize are those on the sides. The priming time required is the least and the pump capacity is the greatest when using those intakes

Question 43

Chapter IV DRAFTING From the standpoint of operating convenience, it is better to use the _______ intake. From the standpoint of maximum efficiency (Volume), it is best to use the ______ intake.

Answer 43

From the standpoint of operating convenience, it is better to use the gated intake opposite the pump panel. From the standpoint of maximum efficiency (Volume), it is best to use the 6” intake on the driver’s side

Question 44

Chapter IV DRAFTING For high quantity flows, the end of the hard sleeve assembly shall be submerged at least ___ inches

Answer 44

For high quantity flows, the end of the hard sleeve assembly shall be submerged at least 18 inches

Question 45

Chapter IV HYDRANT CAPACITY Blue Yellow Orange Red White

Answer 45

Blue 1500 GPM or Greater Yellow 1000 – 1499 GPM Orange 500 – 999 GPM Red 500 GPM or Less White Not flow tested

Question 46

Chapter IV SHUTTING DOWN The _______ shall be lowered before closing the discharge gate or disengaging the pump.

Answer 46

The discharge pressure shall be lowered before closing the discharge gate or disengaging the pump.

Question 47

Chapter IV RATED CAPACITY The pumping apparatus used in this Department are rated for capacity at 150 PSI. Under the system of pumper classification, this signifies that they are ______pumpers.

Answer 47

The pumping apparatus used in this Department are rated for capacity at 150 PSI. Under the system of pumper classification, this signifies that they are Class "A" pumpers.

Question 48

Chapter IV Pump capacity Pressure Capacity Gallons Per Minute 150 _____ 1250/1500/2000 200 _____ 880/1050/1400 250 _____ 625/750/1000

Answer 48

Pressure Capacity Gallons Per Minute 150 Full 1250/1500/2000 200 7/10 880/1050/1400 250 1/2 625/750/1000

Question 49

Chapter IV The relaying of water from one engine to another when it is desirable to place one engine near the fire and supply it with the water from another engine is known as _________

Answer 49

The relaying of water from one engine to another when it is desirable to place one engine near the fire and supply it with the water from another engine is known as "TWO PUMP OPERATION"

Question 50

Chapter IV It is desirable for the attack engine to maintain an intake pressure of ___ PSI.

Answer 50

20psi

Question 51

Chapter IV The manufacturer (Waterous) recommends that the pump be transferred from pressure to volume if the required fire flow is greater than ____ of its rated capacity.

Answer 51

70%