Chapter 12

Question 1

a factor in determining the need for relay pumping operations?

Answer 1

Distance between incident scene and the water source

Question 2

Attack pumpers equipped with an adjustable intake relief valve should be set

Answer 2

between 50 and 75 psi (350 and 525 kPa) to establish a stable operating condition

Question 3

When the source and relay pumpers are ready, the discharge supplying the hoseline on the source pumper is:

Answer 3

opened while the valve on the dump line is closed.

Question 4

The driver/operator of the attack pumper should not attempt to correct minor fluctuations as long as the intake pressure:

Answer 4

does not drop below 20 psi

Question 5

Pressure relief valves reduce the possibility of damage to the pump and other water supply components that may be caused by water hammer when valves are operated too quickly or:

Answer 5

intake pressures rise dramatically.

Question 6

When would a discharge manifold be used to break down the large diameter hose (LDH) into two or more hoselines that may then be connected to different pumpers?

Answer 6

During LDH relay operations that must supply more than one attack pumper

Question 7

When drafting from a static source, the source pumper

Answer 7

may need to develop a higher pump discharge pressure than other pumpers in the relay operation

Question 8

Which of the following may be of smaller capacity due to its ability to use acquired energy of previous pumpers in the relay?

Answer 8

Relay pumper

Question 9

When large diameter hose (LDH) is used in relay operations:

Answer 9

the LDH often requires only one supply line to meet fireground requirements.

Question 10

Which of the following takes water from a hydrant or static source at the beginning of a relay operation?

Answer 10

Eliminates pressure surges and inconsistent supply

Question 11

Putting a relay into operation begins with

Answer 11

the largest capacity pumper working from the water source.

Question 12

is a characteristic of the open relay method?

Answer 12

Requires no adapters or other appliances to connect intake hoses in the system

Question 13

allow later arriving pumpers to tie into the relay and boost pressure and volume after it has already started flowing, without interrupting the water supply?

Answer 13

Inline relay valves

Question 14

Many screw-on intake pressure relief valves are also equipped with a gate valve that allows the:

Answer 14

water supply to the pump to be shut off.

Question 15

describes the open relay method?

Answer 15

Consists of deploying portable folding drop tanks at each intake for pumpers in the relay operation

Question 16

As a relay pumper, it is advisable for driver/operators to maintain an intake pressure of:

Answer 16

20 to 30 psi

Question 17

Centrifugal pumps are rated to pump at their maximum volume capacity at

Answer 17

150 psi

Question 18

The overall capacity of the relay system is determined by the:

Answer 18

smallest pump and the smallest diameter of hose used in the relay.

Question 19

Which of the following should be the pumper with the largest pumping capacity?

Answer 19

Water supply pumper

Question 20

When relay pumpers are equipped with an adjustable intake relief valve, one guideline is that it should be set to:

Answer 20

10 psi (70 kPa) above the discharge pressure of the previous pumper in the relay.

Question 21

The distance of the relay is an important operational consideration because the longer the hose lay,:

Answer 21

the more friction loss will be encountered.

Question 22

Loss of prime or overheating of the pump is MOST likely the result of:

Answer 22

failure to keep water moving through the pump when using a static water supply.

Question 23

When pumpers in the relay operation increase their pump discharge pressure,:

Answer 23

a point will be reached where increased pressure will not increase volume.

Question 24

Placing additional pumpers in the system will increase flow during a relay operation because it shortens the length of hose each pumper must supply and allows pumpers to:

Answer 24

operate at lower pressures and maximum flows within the relay operation.

Question 25

receives water from the source pumper, raises the pressure, and supplies water to the next apparatus?

Answer 25

Relay pumper

Question 26

describes the function of bleeder valves?

Answer 26

Allow air to bleed off as incoming supply hose is charged

Question 27

hen pressure relief valves are preset to allow a predetermined amount of pressure into the fire pump and then the incoming pressure exceeds the preset level, the valve will:

Answer 27

open and dump excess pressure/water until water is entering the pump at the correct pressure.

Question 28

When shutting down the relay, beginning with the attack pumper and coordinating with other pumpers in the relay, each driver/operator should:

Answer 28

slowly decrease the throttle and open the dump line valve.

Question 29

Apparatus equipped with pressure governors should be set in:

Answer 29

pressure mode when acting as the attack pumper and rpm mode while working as a relay pumper.

Question 30

When medium diameter hose (MDH) is used in relay operations, generally:

Answer 30

multiple hoselines are laid.

Question 31

responsible for supplying attack lines and appliances required for fire suppression?

Answer 31

Fire attack pumper

Question 32

can be done if the amount of flow through a relay operation needs to be increased?

Answer 32

Increase the diameter of the supply hose or the number of hoselines

Question 33

When relaying long distances:

Answer 33

equalize spacing between pumpers as much as possible.

Question 34

When need for relay pumping has ended, the operation should be discontinued:

Answer 34

from the fire scene first.

Question 35

is a purpose of relay relief valves?

Answer 35

Enhance firefighter safety

Question 36

statements about elevation pressure in relay operations is MOST accurate?

Answer 36

Elevation pressure is not affected by the amount of water being moved, only by the topography.