Chapter 12

Question 1

1.​Which pumper takes water from a hydrant or static source at the beginning of a relay operation? (426)
​A.​Relay pumper
​B.​Primary pumper
​C.​Fire attack pumper
​D.​Water supply pumper

Answer 1

​D.​Water supply pumper

Question 2

2.​In a relay operation, which should be the pumper with the largest pumping capacity? (426)
​A.​Relay pumper
​B.​Primary pumper
​C.​Fire attack pumper
​D.​Water supply pumper

Answer 2

​D.​Water supply pumper

Question 3

3.​In a relay operation, which pumper receives water from the source pumper, raises the pressure, and supplies water to the next apparatus? (427)
​A.​Relay pumper
​B.​Primary pumper
​C.​Secondary pumper
​D.​Water supply pumper

Answer 3

​A.​Relay pumper

Question 4

4.​Which pumper may be of smaller capacity due to its ability to use acquired energy of previous pumpers in the relay? (427)
​A.​Relay pumper
​B.​Primary pumper
​C.​Secondary pumper
​D.​Fire attack pumper

Answer 4

​A.​Relay pumper

Question 5

5.​Which pumper is responsible for supplying attack lines and appliances required for fire suppression? (427)
​A.​Relay pumper
​B.​Primary pumper
​C.​Secondary pumper
​D.​Fire attack pumper

Answer 5

​D.​Fire attack pumper

Question 6

6.​Which is MOST likely a factor in determining the need for relay pumping operations? (427)
​A.​Number of personnel available at the scene
​B.​Likelihood of nearby exposures catching fire
​C.​Whether or not fire is a multiple-alarm incident
​D.​Distance between incident scene and the water source

Answer 6

​D.​Distance between incident scene and the water source

Question 7

7.​The distance of the relay is an important operational consideration because the longer the hose lay, the: (428)
​A.​more friction loss will be encountered.
​B.​larger the maximum lift will be achieved.
​C.​more the diameter of hose must be decreased.
​D.​greater the total volume of water that will be required.

Answer 7

​A.​more friction loss will be encountered.

Question 8

8.​Which can be done if the amount of flow through a relay operation needs to be increased? (428)
​A.​Transition to a different water source
​B.​Decrease the time spent on relay operations
​C.​Increase the time spent on relay operations
​D.​Increase the diameter of the supply hose or the number of hoselines

Answer 8

​D.​Increase the diameter of the supply hose or the number of hoselines

Question 9

9.​Centrifugal pumps are rated to pump at their maximum volume capacity at _____ at draft. (428)
​A.​100 psi (700 kPa)
​B.​150 psi (1 050 kPa)
​C.​250 psi (1 750 kPa)
​D.​275 psi (1 925 kPa)

Answer 9

​B.​150 psi (1 050 kPa)

Question 10

10.​When pumpers in the relay operation increase their pump discharge pressure,: (428)
​A.​volume will always be increased.
​B.​personnel may be unable to keep up with volume.
​C.​increased stress on the pump may cause volume to decrease.
​D.​a point will be reached where increased pressure will not increase volume.

Answer 10

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

Question 11

11.​In relay operations, elevation pressure: (428)
​A.​is less than simple friction loss when water must be pumped uphill.
​B​is greater than simple friction loss if water must be pumped downhill.
​C.​is affected both by the amount of water being moved and by the topography.
​D.​is not affected by the amount of water being moved, only by the topography.

Answer 11

​A.​is less than simple friction loss when water must be pumped uphill.

Question 12

12.​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: (428)
​A.​periodically take breaks and check all equipment.
​B.​vary the amount of water provided by each pumper.
​C.​operate at higher pressures and maximum flows within the relay operation.
​D.​operate at lower pressures and maximum flows within the relay operation.

Answer 12

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

Question 13

13.​When relaying long distances: (432)
​A.​equalize spacing between pumpers as much as possible.
​B.​spacing between pumpers should be determined by most convenient location.
​C.​pumpers in the front of the relay should be further apart than pumpers toward the end of the relay.
​D.​pumpers in the front of the relay should be closer together than pumpers toward the end of the relay.

Answer 13

​A.​equalize spacing between pumpers as much as possible.

Question 14

14.​Putting a relay into operation begins with: (432)
​A.​the largest capacity pumper working from the water source.
​B.​the smallest capacity pumper working from the water source.
​C.​a pumper with average capacity working from the water source.
​D.​the pumper with the most experienced crew working from the water source.

Answer 14

​A.​the largest capacity pumper working from the water source.

Question 15

15.​When drafting from a static source, the source pumper: (432)
​A.​must have the same pump discharge pressure as other pumpers in the relay operation.
​B.​may need to develop a higher pump discharge pressure than other pumpers in the relay operation.
​C.​may need to develop a lower pump discharge pressure than other pumpers in the relay operation.
​D.​must vary pump discharge pressure to within a range used by other pumpers in the relay operation.

Answer 15

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

Question 16

16.​The overall capacity of the relay system is determined by the: (432)
​A.​average of all pumps and hose used in the relay.
​B.​largest pump and the largest diameter of hose used in the relay.
​C.​largest pump and the smallest diameter of hose used in the relay.
​D.​smallest pump and the smallest diameter of hose used in the relay.

Answer 16

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

Question 17

17.​Loss of prime or overheating of the pump is MOST likely the result of: (432)
​A.​extended relay operations.
​B.​not taking periodic breaks during relay operations.
​C.​moving too much water through the pump when using a static water supply.
​D.​failure to keep water moving through the pump when using a static water supply.

Answer 17

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

Question 18

18.​When the source and relay pumpers are ready, the discharge supplying the hoseline on the source pumper is: (433)
​A.​closed and the valve on the dump line is closed.
​B.​opened and the valve on the dump line is opened.
​C.​closed while the valve on the dump line is opened.
​D.​opened while the valve on the dump line is closed.

Answer 18

​D.​opened while the valve on the dump line is closed.

Question 19

19.​As a relay pumper, it is advisable for driver/operators to maintain an intake pressure of: (433)
​A.​10 to 20 psi (70 to 140 kPa).
​B.​20 to 30 psi (140 to 210 kPa).
​C.​30 to 40 psi (210 to 280 kPa).
​D.​40 to 50 psi (280 to 350 kPa).

Answer 19

​B.​20 to 30 psi (140 to 210 kPa).

Question 20

20.​Apparatus equipped with pressure governors should be set in: (433)
​A.​rpm mode when acting as the attack pumper and while working as a relay pumper.
​B.​pressure mode when acting as the attack pumper and while working as a relay pumper.
​C.​rpm mode when acting as the attack pumper and pressure mode while working as a relay pumper.
​D.​pressure mode when acting as the attack pumper and rpm mode while working as a relay pumper.

Answer 20

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

Question 21

21.​When relay pumpers are equipped with an adjustable intake relief valve, one guideline is that it should be set to: (434)
​A.​the same discharge pressure as the previous pumper in the relay.
​B.​10 psi (70 kPa) above the discharge pressure of the previous pumper in the relay.
​C.​10 psi (70 kPa) below the discharge pressure of the previous pumper in the relay.
​D.​within ten percent of the discharge pressure of the previous pumper in the relay.

Answer 21

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

Question 22

22.​Attack pumpers equipped with an adjustable intake relief valve should be set: (434)
​A.​at exactly 50 psi (350 kPa) to establish a stable operating condition.
​B.​at exactly 75 psi (525 kPa) to establish a stable operating condition.
​C.​between 50 and 75 psi (350 and 525 kPa) to establish a stable operating condition.
​D.​between 75 and 100 psi (525 and 700 kPa) to establish a stable operating condition.

Answer 22

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

Question 23

23.​The driver/operator of the attack pumper should not attempt to correct minor fluctuations as long as the intake pressure: (434)
​A.​varies within a range of ten percent.
​B.​does not drop below 20 psi (140 kPa).
​C.​does not drop below 40 psi (280 kPa).
​D.​varies within a range of twenty percent.

Answer 23

​B.​does not drop below 20 psi (140 kPa).

Question 24

24.​When need for relay pumping has ended, the operation should be discontinued: (434)
​A.​from the fire scene first.
​B.​from the relay pumpers first.
​C.​by all pumpers at the same time.
​D.​from all relay pumpers then the attack pumper.

Answer 24

​A.​from the fire scene first.

Question 25

25.​When shutting down the relay, beginning with the attack pumper and coordinating with other pumpers in the relay, each driver/operator should: (434)
​A.​slowly increase the throttle and close the dump line valve.
​B.​slowly increase the throttle and open the dump line valve.
​C.​slowly decrease the throttle and close the dump line valve.
​D.​slowly decrease the throttle and open the dump line valve.

Answer 25

​D.​slowly decrease the throttle and open the dump line valve.

Question 26

26.​What should be done to prevent water hammer? (434)
​A.​Close all valves slowly.
​B.​Close all valves quickly.
​C.​Avoid closing valves during operations.
​D.​Close valves half-way, wait, then close fully.

Answer 26

​A.​Close all valves slowly.

Question 27

27.​The open relay method consists of: (435)
​A.​multiple pumpers of exactly the same size operating in a relay.
​B.​using a natural water source for supplying relay pumpers.
​C.​only one source pumper, relay pumper and fire attack pumper.
​D.​deploying portable folding drop tanks at each intake for pumpers in the relay operation.

Answer 27

​D.​deploying portable folding drop tanks at each intake for pumpers in the relay operation.

Question 28

28.​Which is an advantage when operating in an open relay? (435)
​A.​Requires less experienced personnel
​B.​Decreases operational costs of incidents
​C.​Eliminates pressure surges and inconsistent supply
​D.​Increases amount of water available for fire suppression

Answer 28

​C.​Eliminates pressure surges and inconsistent supply

Question 29

29.​Which is a characteristic of the open relay method? (435)
​A.​Increases number of personnel required for the relay
​B.​Provides significant cost savings for long-term operations
​C.​Requires no adapters or other appliances to connect intake hoses in the system
​D.​Requires a variety of adapters or other appliances to connect intake hoses in the system

Answer 29

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

Question 30

30.​When medium diameter hose(MDH) is used in relay operations, generally: (435)
​A.​multiple hoselines are laid.
​B.​it is supplemented with small diameter hose (SDH).
​C.​it must be supplemented with large diameter hose (LDH).
​D.​the MDH will still require only one supply line to meet fireground requirements.

Answer 30

A.​multiple hoselines are laid.

Question 31

31.​When large diameter hose (LDH) is used in relay operations: (435)
​A.​it is supplemented with small diameter hose (SDH).
​B.​it is supplemented with medium diameter hose (MDH).
​C.​the LDH often requires only one supply line to meet fireground requirements.
​D.​multiple supply lines are still required to meet fireground requirements.

Answer 31

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

Question 32

32.​What is the purpose of relay relief valves? (435)
​A.​Enhance firefighter safety
​B.​Require fewer personnel for the system
​C.​Allow equipment to exceed recommendations
​D.​Allow faster operation of the parts of the relay

Answer 32

​A.​Enhance firefighter safety

Question 33

33.​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: (435)
​A.​water supply fluctuates.
​B.​valves are operated too slowly.
​C.​intake pressures rise dramatically.
​D.​intake pressures decrease dramatically.

Answer 33

​C.​intake pressures rise dramatically.

Question 34

34.​When 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: (435)
​A.​automatically close.
​B.​initiate a warning light that is seen in the cab.
​C.​close slowly and remain closed until excess pressure/water is stabilized.
​D.​open and dump excess pressure/water until water is entering the pump at the correct pressure.

Answer 34

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

Question 35

35.​Many screw-on intake pressure relief valves are also equipped with a gate valve that allows the: (435)
​A.​pump to be manually shut off.
​B.​water supply to the pump to be shut off.
​C.​water supply to the pump to be doubled.
​D.​pump to signal when water is no longer required.

Answer 35

​B.​water supply to the pump to be shut off.

Question 36

36.​What is the function of bleeder valves? (435)
​A.​Allow water supply to the pump to be shut off
​B.​Allow air to bleed off as incoming supply hose is charged
​C.​Break the large diameter hose (LDH) into two or more hoselines
​D.​Allow excess water to bleed off as incoming supply hose is charged

Answer 36

​B.​Allow air to bleed off as incoming supply hose is charged

Question 37

37.​Which valves 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? (436)
​A.​Gate valves
​B.​Bleeder valves
​C.​Inline relay valves
​D.​Periphery relay valves

Answer 37

​C.​Inline relay valves

Question 38

38.​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? (436)
​A.​During LDH relay operations with limited water supply
​B.​During LDH relay operations in which personnel are limited
​C.​During LDH relay operations in which the attack pumper is of large capacity
​D.​During LDH relay operations that must supply more than one attack pumper

Answer 38

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

Question 39

1.​The pumper that takes water from a hydrant or static source at the beginning of a relay operation is the: (426)
​A.​fill pumper.
​B.​relay pumper.
​C.​initial pumper.
​D.​water supply pumper.

Answer 39

​D.​water supply pumper.

Question 40

2.​The pumper that receives water from the source pumper, raises the pressure, and then supplies water to the next apparatus is the: (427)
​A.​fill pumper.
​B.​relay pumper.
​C.​initial pumper.
​D.​secondary pumper.

Answer 40

​B.​relay pumper.

Question 41

3.​The factor that MOST determines the need for relay operations is: (427)
​A.​the number of pumpers needed for the scene.
​B.​whether the fire is likely to increase significantly.
​C.​the value of the property involved in the incident.
​D.​the distance between the incident scene and the water source.

Answer 41

​D.​the distance between the incident scene and the water source.

Question 42

4.​Which statement about pressure during relay pumping operations for the attack pumper is MOST accurate? (434)
​A.​Driver/operator should experience no variation in pressure
​B.​Driver/operator should expect large variations in pressure
​C.​Driver/operator should expect small variations in pressure
​D.​Driver/operator will not be able to determine pressure variations

Answer 42

​C.​Driver/operator should expect small variations in pressure

Question 43

5.​Which should be the first apparatus discontinued when relay operations are no longer needed? (434)
​A.​Pumpers at the fire scene
​B.​Pumpers at the water supply
​C.​Relay pumpers that are first in line
​D.​Relay pumpers that are last in line

Answer 43

​A.​Pumpers at the fire scene

Question 44

6.​Which relay method requires no adapters or other appliances to connect intake hoses in the system? (435)
​A.​Open relay
​B.​Closed relay
​C.​Ground relay
​D.​Portable relay

Answer 44

​A.​Open relay

Question 45

7.​Which valve opens and dumps excess pressure/water until water is entering pump at correct pressure? (435)
​A.​Correction valve
​B.​Inline relay valve
​C.​Pressure relief valve
​D.​Pump discharge valve

Answer 45

​C.​Pressure relief valve

Question 46

8.​Which valve is placed along the length of a supply hose and permits a pumper to connect to the valve to boost pressure in the hose? (436)
​A.​Correction valve
​B.​Inline relay valve
​C.​Pressure relief valve
​D.​Pump discharge valve

Answer 46

​B.​Inline relay valve